Total Number of Pages - 160
                   UNITED STATES SECURITIES AND EXCHANGE
                          Washington, D.C. 20549

                                 FORM 10-K

    [X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
    EXCHANGE ACT OF 1934
    For the fiscal year ended December 31, 1999

                                    OR

    [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
    SECURITIES EXCHANGE ACT OF 1934
    For the transition period from ________to________
    Commission file No.  1-13883

                      CALIFORNIA WATER SERVICE GROUP
          (Exact name of registrant as specified in its charter)

              Delaware                                 77-0448994
              --------                                 ----------
    (State or other jurisdiction            (IRS Employer Identification No.)
            of Incorporation)

    1720 North First Street  San Jose, California     95112
    ---------------------------------------------     -----
    (Address of Principal Executive Offices)        (Zip Code)

                            (408) 367 8200
                            --------------
    (Registrant's telephone number, including area code)

    Securities registered pursuant to Section 12(b) of the Act:
    Title of Each Class:            Name of Each Exchange on Which Registered:
    Common Stock, $0.01 Par Value   New York Stock Exchange

    Securities registered pursuant to Section 12(g) of the Act:
    Cumulative Preferred Stock, Par Value, $25
                  (Title of Class)

    Indicate  by check mark  whether  the  Registrant  (1) has filed all reports
    required to be filed by Section 13 or 15(d) of the  Securities  Exchange Act
    of 1934 during the preceding 12 months (or for such shorter  period that the
    Registrant was required to file such  reports),  and (2) has been subject to
    such filing requirements for the past 90 days. Yes X No .

    Indicate by check mark if disclosure of delinquent  filers  pursuant to Item
    405 of Regulation S-K is not contained herein, and will not be contained, to
    the best of  Registrant's  knowledge,  in  definitive  proxy or  information
    statements  incorporated  by  reference in Part III of this Form 10-K or any
    amendment to this
    Form 10-K.  [x]

    The aggregate market value of the voting stock held by non-affiliates of the
    Registrant - $375,133,000 on February 18, 2000.

    Common stock outstanding at February 18, 2000 -12,935,612 shares.


                                                                               1




                                  EXHIBIT INDEX

The exhibit index to this Form 10-K is on page 27

                       DOCUMENTS INCORPORATED BY REFERENCE

Designated  portions  of  Registrant's  Annual  Report to  Stockholders  for the
calendar year ended December 31, 1999 (1999 Annual Report) are  incorporated  by
reference in Part I (Item 1), Part II (Items 5, 6, 7 and 8) and in Part IV (Item
14(a)(1)).

Designated  portions of the  Registrant's  Proxy  Statement of California  Water
Service Group ("Proxy  Statement"),  dated March 17, 2000,  relating to the 2000
annual meeting of stockholders  are incorporated by reference in Part III (Items
10, 11 and 12) as of the date the Proxy  Statement was filed with the Securities
and Exchange  Commission  (SEC).  The Proxy Statement was filed with the SEC via
EDGAR on March 14, 2000.


                                                                               2




                                   TABLE OF CONTENTS



Page

PART I

     Item  1.    Business....................................................  5
                 Forward Looking Statements..................................  5
           a.    General Development of Business.............................  5
                 Rates and Regulation........................................  6
           b.    Financial Information about
                     Industry Segments.......................................  7
           c.    Narrative Description of Business...........................  7
                 Geographical Service Areas and
                     Number of Customers at Year-end.........................  9
                 Water Supply................................................ 10
                 Nonregulated Operations..................................... 13
                  Utility Plant Construction Program
                     and Acquisitions........................................ 14
                 Quality of Water Supplies................................... 14
                 Competition and Condemnation................................ 15
                 Environmental Matters....................................... 15
                 Human Resources............................................. 16
           d.    Financial Information about Foreign and
                     Domestic Operations and Export Sales.................... 16

     Item  2.    Properties.................................................. 16

     Item  3.    Legal Proceedings........................................... 17

     Item  4.    Submission of Matters to a Vote of
                     Security Holders........................................ 17

     Executive Officers of the Registrant.................................... 18

PART II

     Item  5.    Market for Registrant's Common Equity
                     and Related Stockholder Matters......................... 20

     Item  6.    Selected Financial Data..................................... 20

     Item  7.    Management's Discussion and Analysis of
                     Financial Condition and Results of
                     Operations.............................................. 20

     Item  8.    Financial Statements and Supplementary Data................. 20

     Item  9.    Changes in and Disagreements with
                     Accountants on Accounting and

                     Financial Disclosure.................................... 20


                                                                               3





PART III

     Item 10.    Directors and Executive Officers
                     of the Registrant....................................... 20

     Item 11.    Executive Compensation...................................... 20

     Item 12.    Security Ownership of Certain
                     Beneficial Owners and Management........................ 21

     Item 13.    Certain Relationships and Related
                     Transactions............................................ 21


PART IV

     Item 14.    Exhibits, Financial Statement Schedules, and
                     Reports on Form 8-K..................................... 22

Signatures................................................................... 23

Independent Auditors' Report................................................. 25

Schedules.................................................................... 26

Exhibit Index................................................................ 27


                                                                               4





                                     PART I

Item 1   Business.

              Forward Looking Statements

              This report,  including  the sections  incorporated  by reference,
              contains  forward-looking  statements  within  the  meaning of the
              Federal  securities  laws.  Such statements are based on currently
              available information,  expectations,  estimates,  assumptions and
              projections,  and  management's  judgment about  California  Water
              Service Group (Company), the utility industry and general economic
              conditions.  Such  words as  expects,  intends,  plans,  believes,
              estimates,  anticipates  or  variations  of such  words or similar
              expressions are intended to identify  forward-looking  statements.
              The  forward-looking  statements  are  not  guarantees  of  future
              performance.  Actual  results  may vary  materially  from  what is
              contained in a forward-looking statement.  Factors which may cause
              a result  different  than  expected or  anticipated  include state
              regulatory commissions' decisions,  new legislation,  increases in
              suppliers'  prices,  particularly  purchased  water and  purchased
              power prices,  changes in environmental  compliance  requirements,
              acquisitions,  changes in  customer  water use  patterns,  natural
              disasters  such as  earthquakes,  and the  impact  of  weather  on
              operating  results.  The Company  assumes no obligation to provide
              public updates of forward-looking statements.

     a.  General Development of Business

              California  Water Service  Company (Cal Water) was formed in 1926.
              On December 31, 1997, California Water Service Group was formed as
              the  parent  company  of Cal  Water and a second  subsidiary,  CWS
              Utility Services (Utility Services). In 1999, the Company acquired
              Harbor Water Company and South Sound Utility.  These two companies
              were merged to form a third Company  subsidiary,  Washington Water
              Service Company (Washington Water).

              Cal Water  continues to operate as a regulated  utility subject to
              the  jurisdiction of the California  Public  Utilities  Commission
              (CPUC).  Washington Water is a regulated  utility,  subject to the
              jurisdiction  of  the  Washington   Utilities  and  Transportation
              Commission  (WUTC).  It also provides  nonregulated  water service
              under various  operation and maintenance  agreements.  Jointly the
              CPUC and WUTC are referred to as the Commissions.

              Utility  Services  provides   nonregulated  water  operations  and
              related  utility   services.   Existing   nonregulated   contracts
              currently  performed  by the  Company are  transferred  to Utility
              Services  as the  contracts  are renewed or at such time as agreed
              upon between the contracting parties.  New nonregulated  contracts
              within California are executed by Utility Services.

              In conjunction with formation of the holding company  structure on
              December  31,  1997,  each  share of Cal  Water  common  stock was
              exchanged on a two-for-one  basis for the Company's  common stock.
              Per  share  data was  restated  where  necessary  to  reflect  the
              effective  two-for-one  stock  split.  Each  share  of  Cal  Water
              preferred  stock was  converted  into one  share of the  Company's
              preferred stock. To maintain relative voting strength,  the number
              of votes to which each  preferred  share is  entitled  was doubled
              from eight to sixteen.

              The Company's mailing address and principal  executive offices are
              located  at  1720  North  First  Street,  San  Jose,   California;
              telephone number:  408-367-8200.  The Company maintains a web site
              that can be accessed via the Internet at http://www.calwater.com.

              During the year ended December 31, 1999, there were no significant
              changes in the kind of products  produced or services  rendered by
              the Company or its  operating  subsidiaries,  or in its markets or
              methods of distribution.


                                                                               5



              Cal  Water  is  the  largest   investor-owned   water  company  in
              California and the fourth  largest in the United  States.  It is a
              public water  utility  providing  water  service to  approximately
              387,600  residential,  commercial and  industrial  customers in 58
              California  cities  and  communities  through  21  separate  water
              systems or  districts.  In the 20 regulated  systems,  which serve
              381,500  customers,  rates  and  operations  are  subject  to  the
              jurisdiction of the CPUC. An additional  6,100  customers  receive
              service  through a long-term  lease of the City of Hawthorne water
              system,  which is not  subject  to CPUC  regulation.  Nonregulated
              operations   are  described  in  section  Item  1.c.,   "Narrative
              Description of Business - Nonregulated Operations."

              Washington  Water is the largest  investor  owned water utility in
              the state.  It was  formed in  December  1999 and is  incorporated
              under  the laws of the  state  of  Washington.  Its two  operating
              districts provide water service to 12,000 customers subject to the
              regulation of the WUTC. An additional  2,800  customers are served
              under operating agreements with private system owners that are not
              subject to WUTC regulation.

              Rates and Regulation

              Water  utility  rates and service for the  regulated  business are
              subject to jurisdiction of the state regulatory  Commissions.  The
              Commissions'  decisions and the timing of those decisions can have
              a significant impact on operations and earnings.

              Since the  Company's 23  operating  districts  are not  physically
              integrated,  rates are set independent for each district.  General
              office expenses and plant  investments  are considered  separately
              and allocated ratably to the operating districts. The cost of debt
              and equity  capital for  ratemaking  purposes is  determined  on a
              company-wide basis.

              General  rate  applications  in  California   consider  all  of  a
              district's   operating  costs  and  capital   requirements  for  a
              succeeding  three-year period. The Commission's  decision in these
              applications  typically  authorize an immediate  rate increase and
              step  rate  increases  for the  following  two  years.  Step  rate
              increases are intended to maintain the authorized return on equity
              (ROE) in succeeding  years.  Subsequent  general rate applications
              can be filed in the third year after a district receives a general
              rate case  decision.  Annually  districts  that are  eligible  for
              general  rate case  filings are  reviewed by the Company and where
              appropriate applications are submitted.  Applications are filed in
              July with a decision  expected about 10 months later.  Offset rate
              adjustments  are allowed to recover the costs of purchased  water,
              purchased power and pump taxes.

              In  Washington,   general  rate   applications  are  submitted  as
              necessary.  Decisions are generally issued about four months after
              filing.

              Key  factors  considered  in  determining the  need to file a rate
              application include:
              o        current earnings of the district
              o        expected future rates of return
              o        cost of debt and equity capital
              o        capital structure
              o        future operating expectations
              o        additional capital expenditures

              With  districts  on varying  rate case  cycles,  general rate case
              applications  are  normally  filed  annually  for a portion of the
              districts.  The number of customers affected by each filing varies
              from year to year.  For  example,  the 1996  filings  included  11
              percent  of  regulated  customers,  the 1997  filings  included  7
              percent and the 1998  filings  included 25 percent.  There were no
              general rate applications filed in 1999.


                                                                               6



              2000 Rate Application Filings

                    During 2000,  16  districts,  including  the two  Washington
              state  districts,   are  eligible  for  general  rate  application
              filings.  These  districts  represent  over  70% of all  regulated
              customers. The Company will review each district and determine the
              need and  appropriateness  of a general rate  application  filing.
              Applications for the California districts will be filed in July in
              accordance with the CPUC's rate processing schedule.  Decisions in
              these  applications  are anticipated late in the second quarter of
              2001.  Additionally,  the  Company  expects to file  general  rate
              applications  for the two  Washington  districts  during 2000. The
              most recent general rate  application  filing with the WUTC was in
              1998.

              1999 Rate Application Filings

                    During  1999,  no general rate  applications  were filed for
              regulated customers.  The Company's regulatory staff reviewed each
              of the  eligible  districts  and  determined  that no general rate
              applications were warranted.

                    A rate  increase  was  submitted  for the City of  Hawthorne
              water system.  The Hawthorne city council exercises rate authority
              over the  proceeding.  A decision  for this  application  which is
              estimated  to provide  about  $350,000 of new revenue in the first
              twelve months after it becomes  effective,  is expected during the
              second quarter of 2000.

              1998 Rate Application Filings

                  In  1998,  14  Cal  Water   districts   plus  General   Office
              operations,  were  eligible  for general  rate  filings.  Earnings
              levels in those  districts  were  reviewed  and  applications  for
              additional  rate  consideration  were  filed with the CPUC in July
              1998 for four  districts and the  Company's  General  Office.  The
              applications involved 25% of the regulated customers.

                  In January 1999, the Company  reached  agreement with the CPUC
              staff  regarding  the  applications.   The  commission's  decision
              approving the settlement was effective in May 1999 and is expected
              to generate  $4,095,000  in total  additional  revenue  during the
              first twelve  months  following  its  effective  date. A 9.55% ROE
              providing  $1,916,000  in  additional  revenue  was adopted in the
              decision. In addition, the decision provides another $2,179,000 in
              revenue   for   environmental    compliance,    specific   capital
              expenditures,  and  recovery  of  General  Office  expenses.  This
              additional revenue is not reflected in the 9.55% ROE calculation.

              Second Amended Contract - Stockton East Water District

                    In  January  1995,  a  consultant  retained  by  the  CPUC's
              Organization  of  Ratepayer  Advocates  completed  a report on the
              reasonableness  of  the  Second  Amended  Contract.  The  contract
              pertains to the sale and delivery of water to Cal Water's Stockton
              District  by the  Stockton-East  Water  District.  Parties  to the
              contract are Cal Water,  Stockton-East Water District, the City of
              Stockton and San Joaquin County.  The consultant's  report alleged
              that the Company was  required to receive CPUC  approval  prior to
              entering  into  the  Second  Amended   Contract  and   furthermore
              challenges the  reasonableness  of the Second Amended Contract for
              ratemaking purposes.  However, the report did not include specific
              ratemaking  recommendations.  While no action is now in process or
              pending, the issue may be revisited in the Company's next Stockton
              district general rate  application.  Also refer to a discussion of
              this issue under "Item 3. Legal Proceedings".

     b.  Financial Information about Industry Segments

              The Company operates primarily in one business segment, the supply
              and distribution of water, and the provision of related services.

     c.  Narrative Description of Business

              The  Company  is  the  sole  shareholder  of its  three  operating
              subsidiaries:  California Water Service Company,  Washington Water
              Service Company and CWS Utility Services.


                                                                               7



              The Company's business,  which is carried on through its operating
              subsidiaries,  consists  of  the  production,  purchase,  storage,
              purification,   distribution  and  sale  of  water  for  domestic,
              industrial,  public and irrigation  uses, and for fire protection.
              It  also  provides  water  related  services,  including  contract
              operation  of  water  systems  and  utility  related  services  to
              municipalities and other private companies.

              The water business  fluctuates  according to the demand for water,
              which is partially dictated by seasonal conditions, such as summer
              temperatures  or the  amount and  timing of  precipitation  in the
              Company's service territories.

              The Company  distributes  water in accordance  with accepted water
              utility methods. Franchises and permits are held in the cities and
              communities where the Company operates. The franchises and permits
              allow the Company to operate  and  maintain  facilities  in public
              streets as necessary.

              The City of  Hawthorne  water  system is operated  under a 15-year
              lease that  commenced  in February  1996.  Under other  contracts,
              three municipally owned water systems, eight privately owned water
              systems and two reclaimed water distribution systems are operated.
              Billing services are also provided to a number of  municipalities.
              These  operations  are  discussed  in more  detail in a  following
              section titled "Nonregulated Operations."

              The Company intends to continue to explore opportunities to expand
              its regulated and nonregulated businesses. The opportunities could
              include system  acquisitions,  lease  arrangements  similar to the
              City of Hawthorne  contract,  full service  system  operation  and
              maintenance  agreements,   billing  contracts  and  other  utility
              related  services.  The Company  believes  that a holding  company
              structure,  as  discussed  above,  makes  it more  competitive  in
              providing  nonregulated  utility  services,  which  would  not  be
              subject to CPUC  jurisdiction.  The Company is  investigating  new
              business  opportunities  in the western United States as evidenced
              by its expansion into the state of Washington.


                                                                               8




         Geographical Service Areas and Number of Customers at Year-end

         The principal markets for the Company's products and services are users
         of water within the Company's service areas. The Company's geographical
         service  areas or districts  for both the  regulated  and  nonregulated
         operations and the approximate  number of customers served in each area
         at December 31, 1999, are listed below.

         SAN FRANCISCO BAY AREA
           Mid-Peninsula (serving San Mateo and
                San Carlos)                                 35,700
           South San Francisco (including Colma
                and Broadmoor)                              16,200
           Bear Gulch (serving Menlo Park, Atherton,
                Woodside and Portola Valley)                21,500
           Los Altos (including portions of Cupertino,
                Los Altos Hills, Mountain View
                and Sunnyvale)                              18,300
           Livermore                                        16,900       108,600
                                                            ------

         SACRAMENTO VALLEY
           Chico (including Hamilton City)                  22,800
           Oroville                                          3,500
           Marysville                                        3,700
           Dixon                                             2,800
           Willows                                           2,300        35,100
                                                            ------

         SALINAS VALLEY
           Salinas                                          25,900
           King City                                         2,200        28,100
                                                            ------

         SAN JOAQUIN VALLEY
           Bakersfield                                      81,600
           Stockton                                         41,600
           Visalia                                          29,700
           Selma                                             5,100       158,000
                                                            ------

         LOS ANGELES AREA
           East Los Angeles (including portions of
             the cities of Commerce and Montebello)         29,100
           Hermosa Redondo (serving Hermosa Beach,
            Redondo Beach and a portion of Torrance)        25,400
           Palos Verdes (including Palos Verdes
             Estates, Rancho Palos Verdes, Rolling
             Hills Estates and Rolling Hills)               23,700
           Westlake (a portion of Thousand Oaks)             6,900
           Hawthorne (leased municipal system)               6,100        91,200
                                                            ------

         WASHINGTON
           Harbor                                           11,000
           South Sound                                       3,800        14,800
                                                            -------      -------


         TOTAL                                                           435,800


                                                                               9



         Water Supply

         The Company's  water supply for the 23 operating  districts is obtained
         from wells,  surface  runoff or diversion,  and by purchase from public
         agencies and other wholesale  suppliers.  The Company's supply has been
         adequate  to meet  consumption  demands,  however,  during  periods  of
         drought some districts have experienced mandatory water rationing.

         California's  rainy season  usually  begins in November  and  continues
         through  March  with  December,   January  and  February   historically
         recording  the most  rainfall.  During  winter  months  reservoirs  and
         underground  aquifers are replenished by rainfall.  Snow accumulated in
         the  mountains  provides  an  additional  water  source when spring and
         summer temperatures melt the snowpack producing runoff into streams and
         reservoirs, and also replenishing underground aquifers.

         Washington  receives  rain in all  seasons  with the  majority  falling
         during winter months.

         During  years in which  precipitation  is  especially  heavy or extends
         beyond the spring into the early summer,  customer  demand can decrease
         from historic  normal  levels,  generally due to reduced  outdoor water
         usage.  This was the case  during  1995 and  1998,  when  winter  rains
         continued  well into the spring  and were  accompanied  by cooler  than
         normal  temperatures.  Likewise,  an early  start to the  rainy  season
         during  the fall can  cause a  decline  in  customer  usage  and have a
         negative impact on revenue.

         The  Company's  water  business  is  seasonal  in  nature  and  weather
         conditions  can have a  pronounced  effect on  customer  usage and thus
         operating revenues and net income.  Customer demand for water generally
         is less during the  normally  cooler and rainy  winter  months.  Demand
         increases in the spring when warmer weather  gradually  returns and the
         rains  end.  Temperatures  are warm  during  the  generally  dry summer
         months,  resulting in increased demand. Water usage declines during the
         fall as temperatures decrease and the rainy season approaches.

         During years of less than normal rainfall, customer demand can increase
         as  outdoor  water  usage  continues  into the fall  and  winter.  When
         rainfall is below average for consecutive years, drought conditions can
         result and certain  customers may be required to reduce  consumption to
         preserve  or  match  available  supply.   As  an  example,   California
         experienced a six-year period when rainfall was annually below historic
         average.  The drought  period ended with the winter of 1992-93.  During
         that six-year  period some districts had water  rationing  requirements
         imposed on customers.  In certain  districts,  penalties were collected
         from customers who exceeded  allotments.  During past drought  periods,
         the CPUC has allowed  modifications to consumer  billings that provided
         the  Company a means to recover a portion  of  revenue  that was deemed
         lost due to conservation measures.

         Historically,  about  half  of  the  water  supply  is  purchased  from
         wholesale  suppliers with the balance pumped from wells.  Well water is
         generally less expensive and the Company strives to maximize use of its
         well  sources.  A small  portion of the supply is received from surface
         runoff in the Company's Bear Gulch  district.  During 1999, 110 billion
         gallons were  delivered to customers.  Approximately  53 percent of the
         supply  was  obtained  from  wells and 47 percent  was  purchased  from
         wholesale  suppliers.  The following  table shows the quantity of water
         purchased in each operating district during 1999.

                                    Supply
             District              Purchased   Source of Purchased Supply
             --------              ---------   --------------------------
         SAN FRANCISCO BAY AREA

             Mid-Peninsula         100%        San Francisco Water Department
             South San Francisco   85%         San Francisco Water Department
             Bear Gulch            89%         San Francisco Water Department


                                                                              10



             Los Altos             83%         Santa Clara Valley Water District
             Livermore             69%         Alameda County Flood Control
                                                 and Water Conservation District

         SACRAMENTO VALLEY

             Oroville              94%         Pacific Gas and Electric Co.
                                    3%         County of Butte

         SAN JOAQUIN VALLEY

             Bakersfield           17%         Kern County Water Agency
             Stockton              70%         Stockton-East Water District

         LOS ANGELES AREA

             East Los Angeles      69%         Central Basin Municipal
                                                 Water District
             Hawthorne             87%         West Basin Municipal
                                                 Water District
             Hermosa Redondo       95%         West Basin Municipal
                                                 Water District
             Palos Verdes          100%        West Basin Municipal
                                                 Water District
             Westlake              100%        Russell Valley Municipal
                                                 Water District


         The balance of the required supply for the above districts was obtained
         from wells,  except for Bear Gulch  where the balance is obtained  from
         surface  runoff  from the local  watershed  and  processed  through the
         Company's  treatment plant before being  delivered to the  distribution
         system.  The Company  also  operates a treatment  plant in the Oroville
         district  where surface water  purchased from a wholesaler is processed
         before delivery to the system.

         Historically,   groundwater  has  yielded  10  to  15  percent  of  the
         Hermosa-Redondo  district supply.  During 1996, wells were taken out of
         service while treatment facilities were being installed.  One treatment
         facility was completed during 1998 and the well returned to service.  A
         second  well was  returned  to  service  in 1999 and the third  well is
         expected online in early 2000.

         The Chico,  Marysville,  Dixon and Willows  districts in the Sacramento
         Valley,  the Salinas and King City districts in the Salinas Valley, and
         the Selma and Visalia  districts in the San Joaquin Valley obtain their
         entire  supply  from  wells.   Harbor  and  South  Sound  districts  in
         Washington also obtain their entire supplies from wells.

         Purchases  for  the  Los  Altos,  Livermore,   Oroville,  Stockton  and
         Bakersfield  districts are pursuant to long-term  contracts expiring on
         various dates after 2011.

         The purchased supplies for the East Los Angeles, Hermosa-Redondo, Palos
         Verdes and Westlake  districts,  and the City of  Hawthorne  system are
         provided by public  agencies  pursuant to an  obligation  of  continued
         nonpreferential service to purveyors within the agencies' boundaries.

         Purchases  for the South San  Francisco,  Mid-Peninsula  and Bear Gulch
         districts  are in  accordance  with  long-term  contracts  with the San
         Francisco Water Department expiring on June 30, 2009.

         The price of wholesale  water  purchases is subject to pricing  changes
         imposed by the various wholesale suppliers. Price changes are generally
         beyond the Company's  control.  Shown below


                                                                              11




         are wholesaler price rates and increases that became effective in 1999,
         and estimated wholesaler price rates and estimated changes for 2000.

                               1999                                 2000
                               ----                                 ----
                  Effective   Percent                 Effective    Percent
   District        Month      Change      Unit Cost    Month       Change      Unit Cost
   --------        -----      ------      ---------    -----       ------      ---------
                                                           
Bakersfield                      0.0%        $125/af                 0.0%         $125/af
Bear Gulch           July       36.7%       0.82/ccf     July        3.7%        0.85/ccf
East Los Angeles     July        2.1%         478/af     July        1.5%          485/af
Hermosa Redondo                  0.0%         528/af                 0.0%          528/af
Livermore            Jan.        4.0%      1.212/ccf     Jan.        2.1%       1.237/ccf
Los Altos            July        7.6%         355/af     July        7.0%          380/af
Oroville             Jan.        3.4%    61,350/year     Jan.       14.8%     70,400/year
Palos Verdes                     0.0%         528/af                 0.0%          528/af
Mid Peninsula        July       36.7%       0.82/ccf     July        3.7%        0.85/ccf
So. San Francisco    July       36.7%       0.82/ccf     July        3.7%        0.85/ccf
Stockton             April      (9.1)%  250,820/year     April       7.0%    268,400/year
Westlake             Jan.        1.1%         560/af     Jan.        1.2%          570/af

         af = acre foot; ccf = hundred cubic feet; year = fixed annual cost

         During 1997, two wholesale  water  suppliers  refunded moneys which had
         been overcollected from wholesale water customers. The Company received
         a one-time  refund of $2.5  million in May 1997 that was  credited as a
         reduction of purchased water expense.

         Rainfall in the Company's  service  areas for the  1999-2000  season is
         above normal as of February 29,  2000.  The mountain  snowpack is about
         normal.  Water levels in  underground  aquifers that provide  supply to
         districts  served by well water  improved in recent  years due to above
         average  rainfall.  Most  regions  have  recorded  positive  changes in
         groundwater levels the past two years. Regional groundwater  management
         planning  continues as required.  Existing laws provide a mechanism for
         local agencies to maintain  control of their  groundwater  supply.  The
         Company continually updates long range projections and works with local
         wholesale  suppliers  to  ensure  an  adequate  future  supply  to meet
         customer needs.

         The water supply outlook for 2000 is good,  however,  California  faces
         long-term water supply  challenges.  The Company is actively working to
         meet the  challenges by continuing to educate  customers on responsible
         water use practices,  particularly  in the districts with  conservation
         programs approved by the Commissions.

         Progress has been made by Consolidated  Irrigation District (Selma) and
         Kaweah  Delta  Water   Conservation   District  (Visalia)  towards  the
         implementation  of a water  management  plan. The Company  continues to
         participates in the formulation of these plans.

         For a number of years,  the Company has worked with the Salinas  Valley
         water users and the Monterey County Water  Resources  Agency (MCWRA) to
         address  seawater  intrusion  into the  water  supply  for the  Salinas
         district.  MCWRA completed  construction  of the  Castroville  Seawater
         Intrusion  Project in 1998.  This  project is designed to deliver up to
         20,000 acre feet of recycled  water annually to  agricultural  users in
         the nearby  Castroville  area. It is intended to help mitigate seawater
         intrusion into the region by reducing the need to pump groundwater.

         With the City and County of San Francisco,  and the cities of San Bruno
         and Daly  City,  The  Company  is  working  to  prepare  a  groundwater
         management  plan for the  Westside  Basin  from  which  the  South  San
         Francisco  district  pumps a portion of its supply.  Additionally,  the
         Company is working with the City of San Francisco in its development of
         a long-range  water supply master plan for the entire area to which the
         San Francisco Water Department  (SFWD) is the wholesale water supplier.
         The South San  Francisco,  Mid-Peninsula  and Bear Gulch  districts are
         included in SFWD service area.


                                                                              12



         Nonregulated Operations

         Nonregulated  operations include full service operation and maintenance
         of water systems for cities and private  owners,  operation of recycled
         water systems, utility billing services, laboratory services and leases
         of antenna sites

         Nonregulated   revenue  from  water  system   operations  is  generally
         determined on a fee per customer basis.  With the exception of the City
         of  Hawthorne  water  system,  revenue and expenses  from  nonregulated
         operations are accounted for in other income on a pretax basis. Revenue
         and expenses for the City of Hawthorne  lease are included in operating
         revenue  and  operating  expenses  because  the  Company is entitled to
         retain all  customer  billings  and is  generally  responsible  for all
         operating expenses.

         Municipally  owned water  systems are operated  under  contract for the
         cities of  Bakersfield,  Commerce and  Montebello and for eight private
         water  company  systems  in the  Bakersfield,  Livermore,  Salinas  and
         Visalia districts.  Additionally,  the Company's  Washington  districts
         operate numerous systems under contract arrangements.  The Company also
         operates under contract  wastewater  collection  systems in Bakersfield
         and  Livermore.  Excluding  Hawthorne,  the total  number  of  services
         operated under the contracts is about 36,200. With the exception of the
         15-year  Hawthorne  lease discussed  below,  the terms of the operating
         agreements  range from one-year to three-year  periods with  provisions
         for renewals. The first operating agreement was signed with the City of
         Bakersfield in 1977. Upon expiration,  each existing agreement has been
         renewed.

         Recycled water  distribution  systems  located in the Los Angeles Basin
         are  operated  for the West Basin and  Central  Basin  municipal  water
         districts.  Some engineering  department services are also provided for
         these two recycled water systems.

         Meter reading,  billing and customer  service are provided for the City
         of Menlo Park's 4,000 water customers.  Meter reading is also performed
         under contract for the City of Manhattan Beach's 13,000 account system.
         Additionally,  sewer and/or refuse billing services are provided to six
         municipalities.

         Since February 1996, the City of Hawthorne's 6,100 account water system
         has been operated under terms of a 15-year agreement.  The system which
         is  located  near the  Hermosa-Redondo  district  serves  about half of
         Hawthorne's  population.  The lease  required an up-front  $6.5 million
         lease payment to the City which is being amortized over the lease term.
         Additionally,  annual lease payments to the City of $100,000 indexed to
         changes in water rates are required. The Company is responsible for all
         aspects of system operation and capital improvements, although title to
         the system and system improvements resides with the City. At the end of
         the lease, the Company will be reimbursed for the unamortized  value of
         capital  improvements.  In  exchange,  the Company  receives all system
         revenues which amounted to $4.2 million in 1999.

         During  1997,  an agreement  was signed with the Rural North  Vacaville
         Water  District  near the Dixon  district  to design  and build a water
         distribution  system.  The new system will  initially  provide water to
         about 400  services.  The Company has also  negotiated  an agreement to
         operate the system once construction is complete.

         The Company  leases 35 antenna  sites to  telecommunication  companies.
         Individual  lease  payments  range from $750 to $2,200  per month.  The
         antennas  are  used  in  cellular  phone  and  personal   communication
         applications. Other leases are being negotiated for similar uses.

         Laboratory services are also provided to Great Oaks Water Company.


                                                                              13




         Utility Plant Construction Program and Acquisitions

         The Company is  continually  extending,  enlarging  and  replacing  its
         facilities as required to meet  increasing  demands and to maintain its
         systems.  Construction  financing was provided by funds from operations
         and  short-term  bank  borrowings,   advances  for  construction,   and
         contributions  in aid of construction as set forth in the "Statement of
         Cash Flows" on page 26 of the  Company's  1999 Annual  Report  which is
         incorporated  herein by reference.  Advances for  construction are cash
         deposits or facilities deeded from subdivision developers. The advances
         are generally  refundable without interest over a period of 40 years by
         equal annual payments.  Contributions in aid of construction consist of
         nonrefundable cash deposits or facilities  transferred from developers,
         primarily  for fire  protection  and  relocation  projects.  The amount
         received  from  developers  varies  from  year to year as the  level of
         construction activity varies. It is impacted by the demand for housing,
         commercial  development  and  general  business  conditions,  including
         interest rates.

         During 1998,  the Company  funded  expenditures  were in the  following
         areas:  wells,  pumping and storage  facilities,  $6.7  million;  water
         treatment  and  purification  equipment,  $3.1  million;   distribution
         systems $9.6 million;  services and meters, $5.4; other equipment, $6.0
         million.  The increased  expenditure  for  treatment  and  purification
         equipment related to the Hawthorne treatment plant. The other equipment
         expenditures  included  computer  equipment for  installation  of a new
         Local Area Network (LAN) system.

         During 1999,  the Company  funded  expenditures  were in the  following
         areas: land, water rights and structures,  $2.9 million; wells, pumping
         and storage facilities,  $4.9 million; water treatment and purification
         equipment,  $2.9 million;  distribution systems, $9.0 million; services
         and  meters,  $6.1;  other  equipment,  $5.7  million.  Included in the
         expenditures  is acquisition  of the Olcese Water  District  assets and
         continued expenditures for computer technology system upgrades.

         The 2000 construction budget is approximately $35.7 million,  exclusive
         of  additions   and   improvements   financed   through   advances  for
         construction and  contributions  in aid of  construction.  The approved
         budget was for the following areas: land and structures,  $3.9 million;
         wells,  pumping and storage facilities,  $8.4 million;  water treatment
         and purification  equipment,  $1.9 million;  distribution systems $11.1
         million;  services and meters,  $5.1  million;  other  equipment,  $5.3
         million.

         During 1996,  Congress enacted  legislation which exempted from taxable
         income   proceeds   received  from  developers  to  fund  advances  for
         construction and contributions in aid of construction,  except payments
         for installation of services.  Services represent about 20% of deposits
         received  from  developers.  Because of the  legislation,  future water
         utility plant  additions will generally be depreciated  for federal tax
         purposes  on a  straight-line  25-year  life  basis.  The  federal  tax
         exemption of developer  payments will reduce cash flow requirements for
         income taxes. In 1997, California adopted similar legislation regarding
         the taxability of payments received from developers.

         The Department of Treasury intends to issue  regulations  regarding the
         taxability of developer  financed  services.  The Company  participated
         actively  along  with  other  private  water  companies  in  presenting
         evidence to Treasury that would result in services being  classified as
         nontaxable  contributions  in aid of  construction.  However,  the  new
         regulations  are  expected to continue to treat the cost of services as
         taxable income.

         Quality of Water Supplies

         Established operating practices are maintained to produce potable water
         in accordance with normal water utility  practices.  Water entering the
         distribution systems from surface sources is treated in compliance with
         federal Safe Drinking  Water Act (SWDA)  standards.  Most well supplies
         are chlorinated. Water samples from each water system are analyzed on a
         regular,  scheduled basis in compliance  with regulatory  requirements.
         The Company operates a state certified water quality  laboratory at its
         San Jose  General  Office that  provides  testing  for most  California
         operations.  Certain tests are contracted with independent  labs. Local
         independent  labs  provide  water  sample  testing  for the  Washington
         districts.


                                                                              14



         In recent  years,  federal and state  water  quality  regulations  have
         continued to increase.  Recent changes in the SDWA,  which are expected
         to bring  treatment  costs more in line with the actual  health  threat
         posed by  contaminants,  were enacted by Congress  during  1996.  Water
         quality  monitoring and upgrading  treatment  capabilities  to maintain
         compliance with the various  regulations  continues.  These  activities
         include:

         o     monitoring  of all sources for MTBE, a gasoline  additive that is
               widely used in California
         o     upgrading  laboratory  equipment and enhancing analytical testing
               capabilities
         o     installation  of dedicated  sample sites to assure water  samples
               are drawn at a secure source
         o     maintaining  a  state  approved  compliance   monitoring  program
               required by the Safe Drinking Water Act
         o     completion of mandatory  Information  Collection  Rule monitoring
               for specified water systems
         o     ongoing training of laboratory and operating personnel
         o     installation of disinfection treatment at all well sources
         o     treatment systems at two Los Angeles Basin wells and wells at the
               South San Francisco well field which have elevated levels of iron
               and manganese;  the treatment allowed the wells to be returned to
               production  during 1997 and 1998;  thus,  less costly well water,
               rather than purchased water supplies became available
         o     construction  of a new iron and manganese  treatment plant in the
               leased Hawthorne system
         o     installation and operation of several  granular  activated carbon
               (GAC)  filtration  systems  for  removal of  hydrogen  sulfide or
               volatile organic chemicals

         Competition and Condemnation

         Cal  Water  and  Washington  Water  are  regulated  public   utilities,
         providing  water service  within filed  service  areas  approved by the
         Commissions.  Under  California laws, no privately owned public utility
         may compete  with the Company in any  territory  already  served by the
         Company without first obtaining a certificate of public convenience and
         necessity  from the CPUC.  Such  certificates  will be issued only upon
         finding that the Company's service is deficient.

         California  law  provides  that  whenever  a public  agency  constructs
         facilities  to  extend a  utility  system  into the  service  area of a
         privately owned public  utility,  such an act constitutes the taking of
         property  and  requires  reimbursement  to the  utility  for its  loss.
         Further, the state's  constitution and statutes allows  municipalities,
         water  districts  and other  public  agencies to own and operate  water
         systems.  These  agencies are empowered to condemn  properties  already
         operated by  privately  owned public  utilities.  The agencies are also
         authorized to issue bonds,  including revenue bonds, for the purpose of
         acquiring or constructing  water systems.  However,  if a public agency
         were to acquire utility property by eminent domain action,  the utility
         would be entitled to just  compensation  for its loss. To the Company's
         knowledge,  no  municipality,  water district or other public agency is
         contemplating  or has any action  pending to acquire or condemn  any of
         the Company's systems.

         In  recent  years,   consolidation   within  the  water   industry  has
         accelerated.  A number of publicly  traded  water  companies  have been
         acquired or merged into larger domestic companies. Several acquisitions
         of publicly  traded  companies  have also been completed by much larger
         foreign  companies.  The  Company  has  participated  in  the  industry
         consolidation  by  its  pending   acquisition  of  Dominguez   Services
         Corporation and by its expansion into Washington  state,  other smaller
         acquisitions  and pursuit of  expanding  nonregulated  operations.  The
         Company  intends  to  continue  pursuing  opportunities  to expand  its
         business in the western United States.

         Environmental Matters

         The  Company  is  subject  to   environmental   regulation  by  various
         governmental authorities. Issues related to water quality are discussed
         separately within this report.

         Compliance  with federal,  state and local  provisions  which have been
         enacted or adopted  regulating  the  discharge  of  materials  into the
         environment,   or  otherwise   relating  to  the   protection   of  the
         environment,  has not had,  as of the date of filing of this Form 10-K,
         any material effect on the


                                                                              15



         Company's capital expenditures,  earnings or competitive position.  The
         Company is unaware of any pending  environmental matters that will have
         a  material  effect  on  its   operations.   Refer  to  Item  3,  Legal
         Proceedings, for additional information.

         The  Company's  environmental  affairs  program is  designed to provide
         compliance  with  underground   storage  tank  regulations,   hazardous
         materials management plans, air quality permitting requirements,  local
         and toxic discharge limitations,  and employee safety issues related to
         hazardous  materials.  The  Company has been  actively  involved in the
         formulation of air quality standards related to water utilities.  Also,
         the Company is  proactive  in looking to  alternative  technologies  in
         meeting  environmental   regulations  and  continuing  the  traditional
         practices of water quality.

         Human Resources

         At  December  31,  1999,  there  were 708  employees,  of whom 192 were
         executive,  administrative  and  supervisory  employees,  and 516  were
         members of unions. In December 1999, a three-year collective bargaining
         agreement, expiring December 31, 2002, was successfully negotiated with
         the  Utility  Workers  Union  of  America,  AFL-CIO,  representing  the
         majority of field and clerical union employees.  Also in December 1999,
         a new three-year  collective  bargaining  agreement was negotiated with
         the International  Federation of Professional and Technical  Engineers,
         AFL-CIO,  representing certain engineering department and water quality
         laboratory  employees.  Both  agreements  were  ratified by the unions'
         membership. As in the past, the agreements were successfully negotiated
         and ratified without a work interruption.

d. Financial Information about Foreign and Domestic Operations and Export Sales.

         The Company makes no export sales.

Item 2.  Properties.

         The Company's physical  properties consist of offices and water systems
         to accomplish the production, storage, purification and distribution of
         water.  These properties are located in or near the Geographic  Service
         Areas  listed  above  under  section  Item  1.c.  entitled   "Narrative
         Description  of the  Business."  The Company's  general  office,  which
         houses accounting,  engineering,  information systems, human resources,
         purchasing,  regulatory,  water quality and executive staffs is located
         in  San  Jose,  California.  All  properties  are  maintained  in  good
         operating condition.

         All principal properties are held in fee simple title. Properties owned
         by Cal Water are subject to the indenture  securing the Company's first
         mortgage bonds of which $116,345,000  remained  outstanding at December
         31, 1999. Washington Water has long-term bank loans totaling about $2.8
         million that is secured primarily by utility plant.

         The Company owns 783 wells and operates  six leased  wells.  There were
         390 storage tanks with a capacity of about 220 million  gallons and one
         reservoir  located in the Bear Gulch district with a 210 million gallon
         capacity.  There are about 4,700 miles of supply and distribution mains
         in the various systems. There are two treatment plants, one in the Bear
         Gulch  district,  the other in  Oroville.  Both  treatment  plants  are
         designed to process six million gallons per day.

         During  1999,  the  average  daily  water  production  was 271  million
         gallons,  while the maximum  production on a single day was 528 million
         gallons. By comparison,  during 1998 the average daily water production
         was 271 million  gallons,  while the maximum  production on one day was
         507 million gallons.

         In the leased system or in systems that are operated under contract for
         municipalities or private companies, title to the various properties is
         held exclusively by the municipality or private company.


                                                                              16



Item 3.  Legal Proceedings.

         The State of California's Department of Toxic Substances Control (DTSC)
         alleges that the Company is a potential  responsible  party for cleanup
         of a toxic contamination  plume in the Chico groundwater.  The DTSC has
         prepared a draft report titled  "Preliminary  Nonbinding  Allocation of
         Financial  Responsibility"  for the  cleanup  which  asserts  that  the
         Company's  share  should be 10 percent.  The DTSC  estimates  the total
         cleanup  cost to be  $8.69  million.  The  toxic  spill  occurred  when
         cleaning  solvents,  which were discharged into the city's sewer system
         by local dry cleaners,  leaked into the underground water supply due to
         breaks  in the  sewer  pipes.  The DTSC  contends  that  the  Company's
         responsibility  stems from its  operation  of wells in the  surrounding
         vicinity  that caused the  contamination  plume to spread.  The Company
         denies  any  responsibility  for  the  contamination  or the  resulting
         cleanup and intends to vigorously resist any action that may be brought
         against it. The Company  believes  that it has  insurance  coverage for
         this  claim  and  that if it were  ultimately  held  responsible  for a
         portion of the cleanup  costs,  there  would not be a material  adverse
         effect on the Company's financial position or results of operations.

         In  December  1997,  the Company  along with the City of Stockton  (the
         Contractors)  filed a lawsuit  against the Stockton East Water District
         (SEWD).  The  Contractors  take 98% of SEWD's  wholesale  potable water
         production.  SEWD also serves treated water to agricultural  customers.
         Under a contract to enable SEWD to meet its financial obligations,  the
         Contractors are required to pay specific Base Monthly  Payments that as
         of June 30,  1997 had  generated  $5.4  million in surplus  funds.  The
         Contractors  contend that a portion of these funds have been or will be
         used  for  purposes   other  than  to  meet  SEWD's  agreed   financial
         obligations.  Presently, all parties to the lawsuit have entered into a
         Stipulated   Preliminary   Injunction.   A  favorable   settlement   is
         anticipated.

         On March 15, 2000,  the Company was served with a lawsuit  naming it as
         one of several  defendants for damages  alleged to have occurred in the
         Marysville  district due to MTBE  contamination in the Company's water.
         The suit did not specify a dollar  amount.  The Company  believes it is
         covered by insurance in such a matter and has tendered the claim to its
         carrier.

         The Company is not a party to any other legal matters, other than those
         which are incidental to its business.

Item 4.  Submission of Matters to a Vote of Security Holders.

         No matters were  submitted to a vote of security  holders in the fourth
         quarter of 1999.


                                                                              17




Executive Officers of the Registrant

Name                        Positions and Offices with California Water Service Group                Age
- ----                        ---------------------------------------------------------                ---
                                                                                                
Robert W. Foy               Chairman of the Board since January 1, 1996.  A director since            63
(1)                         1977.  Formerly President and Chief Executive Officer of Pacific
                            Storage Company, Stockton, Modesto,  Sacramento, San
                            Jose, Vallejo Marysville,  and Merced California,  a
                            diversified  transportation and warehousing company,
                            where he had been employed for 32 years.

Peter C. Nelson             President and Chief Executive Officer since February 1, 1996.             52
(1,2)                       Formerly Vice President, Division Operations (1994-1995) and
                            Region  Vice  President  (1989-1994),  Pacific Gas &
                            Electric Company, a gas and electric public utility.

Gerald F. Feeney            Vice President, Chief Financial Officer and Treasurer since               55
(1)                         November 1994; Controller, Assistant Secretary and Assistant
                            Treasurer from 1976 to 1994.  From 1970 to 1976, an audit
                            manager with Peat Marwick Mitchell & Co., certified public
                            accountants.

Calvin L. Breed             Controller, Assistant Secretary and Assistant Treasurer since             44
(3)                         November 1994;  previously Treasurer of TCI International, Inc.;
                            from 1980 to 1983, a certified public accountant with Arthur
                            Andersen & Co., certified public accountants.

Paul G. Ekstrom             Corporate Secretary since August 1996; Operations Coordinator,            47
(1)                         1993 to 1996; District Manager, Livermore, 1988 to 1993;
                            previously   served  in  various  field   management
                            positions since 1979; an employee since 1972.

(1)      holds the same position with California Water Service Company, CWS Utility Services;
         and Washington Water Service Company
(2)      Chief Executive Officer of Washington Water Service Company
(3)      holds the same position with California Water Service Company



Name                        Positions and Offices with the California Water Service Company          Age
- ----                        ---------------------------------------------------------------          ---

Francis S. Ferraro          Vice President, Regulatory Matters since August 1989.  Employed           50
                            by the California Public Utilities Commission for 15 years, from
                            1985 through 1989 as an administrative law judge.

James L. Good               Vice President, Corporate Communications  and Marketing since             36
(1)                         January 1995.  Previously Director of Congressional Relations for
                            the National Association of Water Companies from  1991 to 1994.

Robert R. Guzzetta          Vice President, Engineering and Water Quality since August 1996;          46
                            Chief Engineer, 1990 to 1996; Assistant Chief Engineer, 1988 to
                            1990; various engineering department positions since 1977.

Christine L. McFarlane      Vice President, Human Resources since August 1996; Director               53
                            of Human Resources, 1991 to 1996; Assistant Director of
                            Personnel, 1989 to 1991; an employee since 1969.


                                                                                                      18



Raymond H. Taylor           Vice President, Operations since April 1995; Vice President and           54
                            Director of Water Quality, 1990 to 1995; Director of Water Quality,
                            1986 to 1990; prior to 1982 an employee of the United States
                            Environmental Protection Agency.

Raymond L. Worrell          Vice President, Chief Information Officer since August 1996;              60
                            Director of Information Systems, 1991 to 1996; Assistant Manager
                            of Data Processing, 1970 to 1991; Data Processing Supervisor, 1967
                            to 1970.

John S. Simpson             Assistant Secretary, Manager of New Business since 1991; Manager          55
                            of New Business Development for the past thirteen years; served in
                            various management positions since 1967.

(1)      Also, Vice President, Marketing with CWS Utility Services.


Name                        Positions and Offices with the Washington Water Service Company          Age
- ----                        ---------------------------------------------------------------          ---
Michael P. Ireland          President since December 1999; previously President of Harbor Water       46
                            Company, Gig Harbor, Washington

No  officer  or  director  has any family  relationship  to any other  executive
officer or director.  No executive  officer is appointed for any set term. There
are no agreements or understandings  between any executive officer and any other
person  pursuant to which he was  selected as an executive  officer,  other than
those  with  directors  or  officers  of the  Company  acting  solely  in  their
authorized capacities.


                                                                              19





                                     PART II

Item 5.  Market for Registrant's Common Equity and Related Stockholder Matters.

         The  information  required  by this item is  contained  in the  section
         captioned "Quarterly Financial and Common Stock Market Data" on page 34
         of the  Company's  1999  Annual  Report and is  incorporated  herein by
         reference.  The number of stockholders  listed in such section includes
         the  Company's  record  stockholders  and an estimate  of  stockholders
         holding stock in street name.

Item 6.  Selected Financial Data.

         The  information  required  by this item is  contained  in the  section
         captioned  "Ten-Year Financial Review" on page 15 of the Company's 1999
         Annual Report and is incorporated herein by reference.

Item 7.  Management's Discussion and Analysis of Financial Condition and Results
         of Operations.

         The  information  required  by this item is  contained  in the  section
         captioned "Management's  Discussion and Analysis of Financial Condition
         and  Results of  Operations,"  on pages 16 through 22 of the  Company's
         1999 Annual Report and is incorporated herein by reference.

Item 8.  Financial Statements and Supplementary Data.

         The  information  required by this item is  contained  in the  sections
         captioned  "Consolidated  Balance  Sheet",  "Consolidated  Statement of
         Income",  "Consolidated  Statement  of  Common  Stockholders'  Equity",
         "Consolidated   Statement  of  Cash  Flows",   "Notes  to  Consolidated
         Financial  Statements" and "Independent  Auditors'  Report" on pages 23
         through 35 of the  Company's  1999  Annual  Report and is  incorporated
         herein by reference. The 1999 Annual Report to stockholders is included
         with this report as Exhibit 13.1.

Item  9. Changes  in  and  Disagreements  with  Accountants  on  Accounting  and
         Financial Disclosure.

         None.


                                    PART III

Item 10. Directors and Executive Officers of the Registrant.

         The information required by this item as to directors of the Company is
         contained in the section  captioned "Board  Committees" and is included
         on page 8 of the 2000 Proxy  Statement,  and in the  section  captioned
         "Proposal No. 1 - Election of Directors" on pages 10 and 11 of the 2000
         Proxy  Statement and is incorporated  herein by reference.  Information
         regarding  executive  officers of the Company is included in a separate
         item captioned "Executive Officers of the Registrant" contained in Part
         I of this report.

Item 11. Executive Compensation.

         The information required by this item as to directors of the Company is
         included under the caption  "Directors  Compensation  Arrangements"  on
         page 9 of the  2000  Proxy  Statement  and is  incorporated  herein  by
         reference.  The information required by this item as to compensation of


                                                                              20



         executive officers,  including officers who are directors,  is included
         under  the  captions  "  Executive  Compensation"  and  "Report  of the
         Compensation   Committee   of  the  Board  of  Directors  on  Executive
         Compensation"  on page 20 through 23 of the 2000 Proxy Statement and is
         incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management.

         The  information  required  by this item is  contained  in the  section
         captioned "Stock Ownership of Management and Certain Beneficial Owners"
         on  page  18,  respectively,   of  the  2000  Proxy  Statement  and  is
         incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions.

         None.


                                                                              21



                                     PART IV

Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K.

  (a) (1) Financial Statements:

              Consolidated Balance Sheet as of December 31, 1999 and 1998.

              Consolidated  Statement of Income for the years ended December 31,
              1999, 1998 and 1997.

              Consolidated  Statement  of Common  Stockholders'  Equity  for the
              years ended December 31, 1999, 1998 and 1997.

              Consolidated  Statement of Cash Flows for the years ended December
              31, 1999, 1998 and 1997.

              Notes to  Consolidated  Financial  Statements,  December 31, 1999,
              1998 and 1997.

              Independent Auditors' Report dated January 21, 2000.

              The above financial  statements are contained in sections  bearing
              the same  captions  on pages 23 through 35 of the  Company's  1999
              Annual  Report to  stockholders  which is filed with this Form 10K
              and incorporated by reference.  Refer to Exhibit 13.1 of this Form
              10-K.

         (2)  Financial Statement Schedule:

Schedule
 Number
- --------
              Independent Auditors' Report dated January 21, 2000.

    II        Valuation  and  Qualifying  Accounts  and  Reserves  for the years
              ending December 31, 1999, 1998, and 1997.

              All other  schedules  are omitted as the required  information  is
              inapplicable  or the  information  is presented  in the  financial
              statements or related notes to the financial statements.

         (3)  Exhibits required to be filed by Item 601 of Regulation S-K.

              The  Exhibit  Index on page 27 of this Form  10-K is  incorporated
              herein by reference.

              The exhibits filed as part of this Form 10-K are attached,  unless
              otherwise indicated. The exhibits listed in the Exhibit Index that
              are not filed with this Form 10-K were  previously  filed with the
              Securities  and Exchange  Commission as  indicated;  unless stated
              otherwise, those exhibits are hereby incorporated by reference.

    (b) Reports on Form 8-K.

         (1)  A Form 8-K was filed  November 23, 1999 to report that on November
              23,  1999  Registrant  had  completed  all  actions  necessary  to
              reincorporate itself as a Delaware corporation.  From November 23,
              1999  forward,  California  Water  Service Group will operate as a
              Delaware  corporation.  The  reincorporation  had been approved by
              shareholders at their annual meeting in April 1999.


                                                                              22



         (2)  February  3,  2000,  a Form 8-K was filed to  report an  amendment
              adopted by the Board of  Directors  of  California  Water  Service
              Group to add director conflict of interest qualification rules.

                                   SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  Registrant  has duly  caused  this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                               CALIFORNIA WATER SERVICE GROUP


Date: March 15, 2000                      By /s/ Peter C Nelson
                                          PETER C. NELSON,
                                          President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following  persons on behalf of the  Registrant and
in the capacities and on the dates indicated:

Date: March 15, 2000                      /s/ Robert W. Foy
                                          ROBERT W. FOY, Chairman,
                                          Board of Directors

Date: March 15, 2000                      /s/ Edward D. Harris, Jr.
                                          EDWARD D. HARRIS, JR., M.D., Member,
                                          Board of Directors

                                          ROBERT K. JAEDICKE, Member,
                                          Board of Directors

Date: March 15, 2000                      /s/ Richard P. Magnuson
                                          RICHARD P. MAGNUSON, Member,
                                          Board of Directors

Date: March 15, 2000                      /s/ Linda R. Meier
                                          LINDA R. MEIER, Member,
                                          Board of Directors

Date: March 15, 2000                      /s/ Peter C. Nelson
                                          PETER C. NELSON
                                          President and Chief Executive Officer,
                                          Member, Board of Directors

Date: March 15, 2000                      /s/ C. H. Stump
                                          C. H. STUMP, Member,
                                          Board of Directors

Date: March 15, 2000                      /s/ George A. Vera
                                          GEORGE A. VERA, Member
                                          Board of Directors


                                                                              23



Date: March 15, 2000                      /s/ J. W. Weinhardt
                                          J. W. WEINHARDT, Member,
                                          Board of Directors

Date: March 15, 2000                      /s/ Gerald F. Feeney
                                          GERALD F. FEENEY,
                                          Vice President, Chief Financial
                                              Officer and Treasurer;
                                          Principal Financial Officer

Date: March 15, 2000                      /s/ Calvin L. Breed
                                          CALVIN L. BREED, Controller,
                                          Assistant Secretary and Assistant
                                               Treasurer;
                                          Principal Accounting Officer



                                                                              24



                          Independent Auditors' Report

Stockholders and Board of Directors
California Water Service Group:


Under date of January 21, 2000, we reported on the consolidated balance sheet of
California Water Service Group as of December 31, 1999 and 1998, and the related
consolidated  statements of income,  common stockholders' equity, and cash flows
for each of the years in the  three-year  period ended  December  31,  1999,  as
contained  in  the  1999  annual  report  to  stockholders.  These  consolidated
financial statements and our report thereon are incorporated by reference in the
annual report on Form 10-K for the year 1999.  In connection  with our audits of
the  aforementioned  consolidated  financial  statements,  we also  audited  the
related  consolidated  financial  statement  schedule  as  listed  in the  index
appearing  under  Item  14(a)(2).  This  financial  statement  schedule  is  the
responsibility of the Company's management.  Our responsibility is to express an
opinion on this financial statement schedule based on our audits.

In our opinion,  such basic  consolidated  financial  statement  schedule,  when
considered in relation to the basic consolidated financial statements taken as a
whole,  presents  fairly,  in all material  respects,  the information set forth
therein.




Mountain View, California                                           /s/ KPMG LLP
January 21, 2000


                                                                              25




                                                    CALIFORNIA WATER SERVICE GROUP                                       Schedule II
                                                  Valuation and Qualifying Accounts
                                            Years Ended December 31, 1999, 1998 and 1997

                                                                                Additions
                                                                          ------------------------
                                                            Balance at    Charged to    Charged to                           Balance
                                                             beginning     costs and         other                            at end
      Description                                            of period      expenses      accounts      Deductions         of period
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                          
1999 (A)Reserves deducted in the balance sheet
          from assets to which they apply:
              Allowance for doubtful accounts               $   206,155   $  335,282    $   41,517      $  466,990       $   115,964
              Allowance for obsolete materials and supplies     137,460       48,000                        85,163           100,297
                                                            ===========   ==========    ==============  ==============   ===========
     (B)Reserves classified as liabilities
          in the balance sheet:
            Miscellaneous reserves:
              General Liability                               1,270,752      125,000                       376,552       $ 1,019,200
              Employees' group health plan                      643,383    3,745,000        31,065       3,908,969           510,479
              Retirees' group health plan                     2,018,373    1,284,000       675,000         575,000         3,402,373
              Workers compensation                            1,003,798       (5,890)                      496,162           501,746
              Deferred revenue - contributions
                in aid of construction                        2,117,632            0       275,170         323,620         2,069,182
              Disability insurance                               26,219                     82,306         108,066               459
                                                            -----------   ----------    --------------  --------------   -----------
                                                            $ 7,080,157   $5,148,110    $1,063,541      $5,788,369       $ 7,503,439
                                                            ========================================================================
              Contributions in aid of construction          $50,576,486                 $3,684,884      $1,644,233       $52,617,137
                                                            ========================================================================


1998 (A)Reserves deducted in the balance sheet
          from assets to which they apply:
              Allowance for doubtful accounts               $   103,596   $  549,344    $   52,796 (3)  $  499,581 (1)   $   206,155
              Allowance for obsolete materials and supplies $   129,193   $   48,000                    $   39,733 (2)       137,460
                                                            ===========   ==========    ==============  ==============   ===========
     (B)Reserves classified as liabilities
          in the balance sheet:
            Miscellaneous reserves:
              General Liability                             $   900,425   $  600,000                    $  229,673 (2)   $ 1,270,752
              Employees' group health plan                      721,120    3,000,000        15,509       3,093,246 (2)       643,383
              Retirees' group health plan                     1,443,373      751,664       458,336         635,000 (2)     2,018,373
              Workers compensation                              661,829      878,423                       536,454 (2)     1,003,798
              Deferred revenue - contributions
                in aid of construction                        2,221,381                    302,137         405,886 (6)     2,117,632
              Disability insurance                               23,811                    107,110         104,702 (2)        26,219
                                                            ----------    ----------    -------------   -------------    -----------
                                                            $ 5,971,939   $5,230,087    $  883,092      $5,004,961       $ 7,080,157
                                                            =======================================================================
              Contributions in aid of construction          $49,297,196                 $3,121,146 (4)  $1,841,856 (5)   $50,576,486
                                                            =======================================================================


1997 (A)Reserves deducted in the balance sheet
          from assets to which they apply:
              Allowance for doubtful accounts               $   100,544   $  620,778    $   70,850 (3)  $  688,576 (1)   $   103,596
              Allowance for obsolete materials and supplies     101,077       48,000                        19,884 (2)       129,193
                                                            ===========   ===========   ==============  ==============   ===========
     (B)Reserves classified as liabilities
          in the balance sheet:
            Miscellaneous reserves:
              General Liability                             $   997,834   $  668,496                    $  765,905 (2)   $   900,425
              Employees' group health plan                      467,986    3,140,000        14,539       2,901,405 (2)       721,120
              Retirees' group health plan                       911,998      581,000       531,375         581,000 (2)     1,443,373
              Workers compensation                              499,651      830,313                       668,135 (2)       661,829
              Deferred revenue - contributions
                 in aid of construction                       2,413,531            0       194,784         386,934 (6)     2,221,381
              Disability insurance                               50,371                    103,167         129,727 (2)        23,811
                                                            ----------    ----------    --------------   ------------    -----------
                                                            $ 5,341,371   $5,219,809    $  843,865      $5,433,106       $ 5,971,939
                                                            =======================================================================
              Contributions in aid of construction          $48,033,820                 $2,808,969 (4)  $1,545,593 (5)   $49,297,196
                                                            ========================================================================

<FN>
(1) Accounts written off during the year.
(2) Expenditures and other charges made during the year.
(3) Recovery of amounts previously charged to reserve.
(4) Properties acquired at no cost, cash contributions and net transfer on non-refundable balances from advances to contributions.
(5) Depreciation of utility plant acquired by contributions charged to a balance sheet account.
(6) Amortized to revenue.
</FN>


                                                                                                                                  26





                                  EXHIBIT INDEX

                                                                                             Sequential
Exhibit                                                                                    Page Numbers
Number                                                                                   in this Report
- ------                                                                                   --------------
                                                                                             
     Unless filed with this Form 10-K, the documents  listed are incorporated by
     reference.

3.    Articles of Incorporation and By-laws:

       3.1     Certificate of  Incorporation  of California  Water Service Group                     27
               and  (Filed as  Exhibit A of the 1999  California  Water  Service
               Group Proxy Statement)

       3.2     Restated  By-laws of California Water Service Group as amended on                     27
               January 26, 2000 (Exhibit E-2 to Form 8-K filed February 3, 2000)

       3.3     Certificate of  Determination of Preferences for Group's Series C                     27
               Preferred Stock (Exhibit 3.2 to Form 10-K for fiscal year 1987)

       3.4     Certificate of  Determination of Preferences for Group's Series D                     27
               Preferred  Stock  (Exhibit A to the  Shareholder  Rights Plan, an
               agreement between  California Water Service Group and BankBoston,
               N.A., rights agent,  dated January 28, 1998 filed as Exhibit 1 to
               Form 8-A and Exhibit 1 to Form 8-K dated February 13, 1998)


4.    Instruments Defining the Rights of Security Holders of California
      Water Service Company, including Indentures:

       4.1     Mortgage of  Chattels  and Trust  Indenture  dated April 1, 1928;                     27
               Eighth  Supplemental  Indenture dated November 1, 1945,  covering
               First Mortgage 3.25% Bonds,  Series C; twenty-first  Supplemental
               Indenture  dated October 1, 1972,  covering First Mortgage 7.875%
               Bonds,  Series  P;  twenty-fourth  Supplemental  Indenture  dated
               November 1, 1973,  covering First Mortgage 8.50% Bonds,  Series S
               (Exhibits 2(b), 2(c), 2(d),  Registration  Statement No. 2-53678,
               of which  certain  exhibits  are  incorporated  by  reference  to
               Registration  Statement  Nos.  2-2187,  2-5923,  2-5923,  2-9681,
               2-10517 and 2-11093.)

       4.2     Thirty-third  Supplemental  Indenture  dated  as of May 1,  1988,                     27
               covering  First Mortgage  9.48% Bonds,  Series BB.  (Exhibit 4 to
               Form 10-Q dated September 30, 1988)


                                                                                                     27



       4.3     Thirty-fourth  Supplemental  Indenture  dated as of  November  1,                     28
               1990,  covering First Mortgage 9.86% Bonds, Series CC. (Exhibit 4
               to Form 10-K for fiscal year 1990)

       4.4     Thirty-fifth Supplemental Indenture dated as of November 1, 1992,                     28
               covering  First Mortgage  8.63% Bonds,  Series DD.  (Exhibit 4 to
               Form 10-Q dated September 30, 1992)

       4.5     Thirty-sixth  Supplemental  Indenture  dated  as of May 1,  1993,                     28
               covering  First Mortgage 7.90% Bonds Series EE (Exhibit 4 to Form
               10-Q dated June 30, 1993)

       4.6     Thirty-seventh  Supplemental  Indenture  dated as of September 1,                     28
               1993,  covering First Mortgage 6.95% Bonds,  Series FF (Exhibit 4
               to Form 10-Q dated September 30, 1993)

       4.7     Thirty-eighth  Supplemental  Indenture  dated as of  October  15,                     28
               1993,  covering First Mortgage 6.98% Bonds,  Series GG (Exhibit 4
               to Form 10-K for fiscal year 1994)

       4.8     Note Agreement  dated August 15, 1995,  pertaining to issuance of                     28
               $20,000,000,  7.28% Series A Unsecured Senior Notes, due November
               1, 2025 (Exhibit 4 to Form 10-Q dated September 30, 1995)

       4.9     Note  Agreement  dated March 1, 1999,  pertaining  to issuance of                     67
               $20,000,000,  6.77% Series B Unsecured Senior Notes, due November
               1, 2028 (Exhibit 4.1 to Form 10-K dated December 31, 1999)


10.    Material Contracts.

       10.1    Water  Supply  Contract  between  Cal Water  and  County of Butte                     28
               relating to Cal Water's Oroville District;  Water Supply Contract
               between Cal Water and the Kern County  Water  Agency  relating to
               Cal Water's Bakersfield  District;  Water Supply Contract between
               Cal  Water and  Stockton  East  Water  District  relating  to Cal
               Water's  Stockton  District.  (Exhibits 5(g),  5(h),  5(i), 5(j),
               Registration  Statement  No.  2-53678,  which  incorporates  said
               exhibits by reference to Form 10-K for fiscal year 1974).

       10.2    Settlement  Agreement and Master Water Sales Contract between the                     28
               City and County of San Francisco and Certain Suburban  Purchasers
               dated August 8, 1984;  Supplement  to  Settlement  Agreement  and
               Master Water Sales Contract,  dated


                                                                                                     28



               August 8, 1984;  Water Supply Contract  between the Cal Water and
               the City and County of San Francisco relating to Cal Water's Bear
               Gulch  District  dated  August 8,  1984;  Water  Supply  Contract
               between  Cal  Water  and the City  and  County  of San  Francisco
               relating to the Cal Water's San Carlos  District  dated August 8,
               1984;  Water Supply  Contract  between the Cal Water and the City
               and County of San Francisco relating to the Cal Water's San Mateo
               District dated August 8, 1984;  Water Supply Contract between the
               Cal Water and the City and County of San  Francisco  relating  to
               the Cal Water's  South San  Francisco  District  dated  August 8,
               1984. (Exhibit 10.2 to Form l0-K for fiscal year 1984).

       10.3    Water Supply  Contract dated January 27, 1981,  between Cal Water                     29
               and the Santa Clara  Valley  Water  District  relating to the Cal
               Water's Los Altos District  (Exhibit 10.3 to Form 10-K for fiscal
               year 1992)

       10.4    Amendments  No. 3, 6 and 7 and Amendment  dated June 17, 1980, to                     29
               Water Supply  Contract  between Cal Water and the County of Butte
               relating to the Cal Water's Oroville  District.  (Exhibit 10.5 to
               Form 10-K for fiscal year 1992)

       10.5    Amendment dated May 31, 1977 to Water Supply Contract between Cal                     29
               Water and  Stockton-East  Water District  relating to Cal Water's
               Stockton  District.  (Exhibit  10.6 to Form 10-K for fiscal  year
               1992)

       10.6    Second Amended  Contract dated  September 25, 1987 among Stockton                     29
               East Water District,  California Water Service Company,  the City
               of Stockton,  the Lincoln Village Maintenance  District,  and the
               Colonial Heights  Maintenance  District Providing for the Sale of
               Treated Water. (Exhibit 10.7 to Form 10-K for fiscal year 1987).

       10.7    Water  Supply  Contract  dated April 19, 1927,  and  Supplemental                     29
               Agreement  dated June 5, 1953,  between Cal Water and Pacific Gas
               and Electric Company  relating to Cal Water's Oroville  District.
               (Exhibit 10.9 to Form 10-K for fiscal year 1992)

       10.8    California  Water Service  Company Pension Plan (Exhibit 10.10 to                     29
               Form 10-K for fiscal year 1992)

       10.9    California   Water   Service   Company   Supplemental   Executive                     30
               Retirement  Plan.  (Exhibit  10.11 to Form 10-K for  fiscal  year
               1992)

       10.10   California Water Service Company Employees Savings Plan. (Exhibit                     30
               10.12 to Form 10-K for fiscal year 1992)


                                                                                                     29




       10.11   Agreement  between the City of  Hawthorne  and  California  Water                     30
               Service Company for the 15-year lease of the City's water system.
               (Exhibit 10.17 to Form 10-Q dated March 31, 1996)

       10.12   Water Supply  Agreement dated September 25, 1996 between the City                     30
               of Bakersfield  and California  Water Service  Company.  (Exhibit
               10.18 to Form 10-Q dated September 30, 1996)

       10.13   Agreement of Merger  dated March 6, 1997 by and among  California                     30
               Water Service  Company,  CWSG Merger Company and California Water
               Service Group.  (Filed as Exhibit A of the 1997 California  Water
               Service   Company   Proxy   Statement/   Prospectus   which   was
               incorporated by reference in the Form 10-K for 1997)

       10.14   Shareholder  Rights Plan; an agreement  between  California Water                     30
               Service Group and BankBoston,  N.A., rights agent,  dated January
               28,  1998  (Exhibit 1 to Form 8-A and Exhibit 1 to Form 8-K dated
               February 13, 1998)

       10.15   Dividend  Reinvestment and Stock Purchase Plan dated February 17,                     30
               1998 (Filed on Form S-3 dated February 17, 1998)

       10.16   California  Water Service Group Directors  Deferred  Compensation                     30
               Plan (Exhibit 10.17 to Form 10-K for fiscal year 1997)

       10.17   California Water Service Group Directors Retirement Plan (Exhibit                     30
               10.18 to Form 10-K for fiscal year 1997)

       10.18   $50,000,000   Business  Loan  Agreements   between  California  1
               California Water Service Group,  California Water Service Company                    133
               and CWS  Utility  Services  and Bank of  America  Bank of America
               dated May 3, 1999, expiring April 30, 2001 (Exhibit 10.18 to Form
               10-K for the year 1999)


                                                                                                     30



       10.20   Certificate of  Determination  regarding  Series D  Participating                     31
               Preferred  Shares.  These shares are relative to the  Shareholder
               Rights  Plan  and  would  be  issued  if  the  rights  plan  were
               triggered.  This is a revised filing at the California  Secretary
               of State's  request in a revised form (Exhibit  10.19 to Form 10Q
               for the quarter ending September 30, 1998)

       10.21   Amendment to the California  Water Service  Company  Supplemental                     31
               Executive  Retirement  Plan  (refer  to  Exhibit  10.9)  to allow
               benefits to be received by Plan  participants at age 60 without a
               reduction in the level of benefit

       10.22   Amendment to the California Water Service Group Deferred Director                     31
               Compensation  Plan (refer to Exhibit 10.16)  regarding the timing
               for electing Plan benefits

       10.24   Executive  Severance  Plan  (Exhibit  10.24  to Form  10K for the                     31
               fiscal year 1998)

       10.25   Water Supply Contract dated November 16, 1994 between  California                     31
               Water Service  Company and Alameda County Flood Control and Water
               Conservation  District relating to Cal Water's Livermore District
               (Exhibit 10.15 to Form 10-K for fiscal year 1994)


13.    Annual Report to Security Holders, Form 10-Q or Quarterly Report to
       Security Holders:

       13.1    1999 Annual Report. Certain sections of the 1999 Annual Report to                     32
               stockholders  are  incorporated  by reference in this 10-K filing
               and filed with this Form 10-K as Exhibit 13. This includes  those
               sections  referred to in Part II, Item 5, Market for Registrant's
               Common Equity and Related Shareholder  Matters;  Part II, Item 6,
               Selected Financial Data; Part II, Item 7, Management's Discussion
               and Analysis of Financial  Condition  and Results of  Operations;
               and Part II, Item 8, Financial Statement and Supplementary Data.

27.    Financial Data Schedule as of December 31, 1999                                               66


                                                                                                     31