UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM 10-Q

(Mark One)

X    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934

For the quarterly period ended March 31, 2001
                                            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 number 1-13883

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

            Delaware                                    77-0448994
- --------------------------------------------------------------------------------
   (Sate or other jurisdiction              (I.R.S. Employer identification No.)
of incorporation or organization)

1720 North First Street, San Jose, CA.                     95112
- --------------------------------------------------------------------------------
(Address of principal executive offices)                (Zip Code)

                                 1-408-367-8200
- --------------------------------------------------------------------------------
              (Registrant's telephone number, including area code)

                                 Not Applicable
- --------------------------------------------------------------------------------
              (Former name, former address and former fiscal year,
                          if changed since last report)

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

APPLICABLE  ONLY TO  ISSURES  INVOLVED  IN  BANKRUPTCY  PROCEEDINGS  DURING  THE
PRECEDING FIVE YEARS Indicate by check mark whether the registrant has filed all
documents  and reports  required to be filed by Sections  12, 13 or 15(d) of the
Securities  Exchange Act of 1934  subsequent to the  distribution  of securities
under a plan confirmed by a court. Yes ___ No ___


APPLICABLE ONLY TO CORPORATE ISSUERS:

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest practicable date. Common shares outstanding as of
April 30, 2001 - 15,182,046. This form 10-Q contains a total of 13 pages.






PART I        FINANCIAL INFORMATION

Item 1.       Financial Statements

     The financial information presented in this 10Q filing has been prepared by
management and has not been audited.





CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED BALANCE SHEET

(In thousands, except per share data)                    March 31,  December 31,
                                                           2001         2000
                                                        ---------     ---------
ASSETS
Utility plant:
       Utility plant                                    $ 865,643     $ 851,281
       Less depreciation and amortization                 274,642       269,273
                                                        ---------     ---------
             Net utility plant                            591,001       582,008
                                                        ---------     ---------

Current assets:
       Cash and cash equivalents                            1,779         3,241
       Receivables                                         17,390        20,613
       Unbilled revenue                                     6,036         7,964
       Materials and supplies at average cost               2,830         2,718
       Taxes and other prepaid expenses                     6,796         6,257
                                                        ---------     ---------
             Total current assets                          34,831        40,793
                                                        ---------     ---------

Other assets:
       Regulatory assets                                   38,313        38,133
       Other assets                                         5,565         5,671
                                                        ---------     ---------
             Total other assets                            43,878        43,804
                                                        ---------     ---------
                                                        $ 669,710     $ 666,605
                                                        =========     =========

CAPITALIZATION AND LIABILITIES
Capitalization:
       Common stock, $.01 par value                     $     151     $     151
       Additional paid-in capital                          49,984        49,984
       Retained earnings                                  145,908       149,185
       Accumulated other comprehensive loss                  (486)         (486)
                                                        ---------     ---------
             Total common stockholders' equity            195,557       198,834
       Preferred stock                                      3,475         3,475
       Long-term debt, less current maturities            187,393       187,098
                                                        ---------     ---------
             Total capitalization                         386,425       389,407
                                                        ---------     ---------

Current liabilities:
       Current maturities of long-term debt                 2,651         2,881
       Short-term borrowings                               18,500        14,598
       Accounts payable                                    24,151        26,493
       Accrued expenses and other liabilities              21,893        19,764
                                                        ---------     ---------
             Total current liabilities                     67,195        63,736

Unamortized investment tax credits                          2,986         2,989
Deferred income taxes                                      26,007        25,620
Regulatory and other liabilities                           20,350        20,316
Advances for construction                                 106,916       105,562
Contributions in aid of construction                       59,831        58,975
                                                        ---------     ---------
                                                        $ 669,710     $ 666,605
                                                        =========     =========

See Notes to Condensed Consolidated Financial Statements





CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED STATEMENT OF INCOME
(In thousands, except per share data)

For the three months ended:                             March 31,      March 31,
                                                          2001           2000
                                                        --------       --------
Operating revenue                                       $ 47,008       $ 46,694
                                                        --------       --------
Operating expenses:
       Operations                                         33,119         31,116
       Maintenance                                         2,740          2,995
       Depreciation and amortization                       4,817          4,471
       Income taxes                                          141            951
       Property and other taxes                            2,399          2,259
                                                        --------       --------
            Total operating expenses                      43,216         41,792
                                                        --------       --------

            Net operating income                           3,792          4,902

Other income and expenses, net                               393            329
                                                        --------       --------
            Income before interest expense                 4,185          5,231
                                                        --------       --------

Interest expense:
       Long-term debt interest                             3,516          3,248
       Other interest                                        448            450
                                                        --------       --------
            Total interest expense                         3,964          3,698
                                                        --------       --------

Net income                                              $    221       $  1,533
                                                        ========       ========

Earnings per share
       Basic                                            $   0.01       $   0.10
                                                        ========       ========
       Diluted                                          $   0.01       $   0.10
                                                        ========       ========
Weighted average shares outstanding
       Basic                                              15,182         15,094
                                                        ========       ========
       Diluted                                            15,294         15,146
                                                        ========       ========
Dividends per share of common stock                     $0.27875       $0.27500
                                                        ========       ========

See Notes to Condensed Consolidated Financial Statements






CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS
For the three months ended


(In thousands)
                                                                                                     March 31,            March 31,
                                                                                                       2001                  2000
                                                                                                     --------              --------
                                                                                                                     
Operating activities
     Net income                                                                                      $    221              $  1,533
                                                                                                     --------              --------
     Adjustments to reconcile net income to net cash
       provided by operating activities:
          Depreciation and amortization                                                                 4,817                 4,471
          Deferred income taxes, investment tax credits
              regulatory assets and liabilities, net                                                      240                (3,057)
          Changes in operating assets and liabilities:
              Receivables                                                                               3,223                 4,513
              Unbilled revenue                                                                          1,928                 1,880
              Accounts payable                                                                         (2,342)               (6,251)
              Other current assets and liabilities                                                      2,129                 1,821
              Other changes, net                                                                         (546)                  606
                                                                                                     --------              --------
              Net adjustments                                                                           9,449                 3,983
                                                                                                     --------              --------
                    Net cash provided by operating activities                                           9,670                 5,516
                                                                                                     --------              --------
Investing activities:
     Utility plant expenditures                                                                       (13,405)               (3,980)
                                                                                                     --------              --------
Financing activities:
     Net short-term borrowings                                                                          3,902                 2,300
     Net long-term debt                                                                                    28                  (126)
     Advances for construction                                                                          2,590                 1,018
     Refunds of advances for construction                                                              (1,239)               (1,190)
     Contributions in aid of construction                                                               1,252                   373
     Dividends paid                                                                                    (4,260)               (3,986)
                                                                                                     --------              --------
                    Net cash provided by (used in)
                       financing activities                                                             2,273                (1,611)
                                                                                                     --------              --------

Change in cash and cash equivalents                                                                    (1,462)                  (75)
Cash and cash equivalents at beginning  of period                                                       3,241                 1,655
                                                                                                     --------              --------
Cash and cash equivalents at end of period                                                           $  1,779              $  1,580
                                                                                                     ========              ========

<FN>
See Notes to Condensed Consolidated Financial Statements
</FN>






                          Notes to Financial Statements

1.   Due to the seasonal nature of the water  business,  the results for interim
     periods are not indicative of the results for a twelve month period.

2.   The  interim  financial  information  is  unaudited.   In  the  opinion  of
     management,  the accompanying  financial statements reflect all adjustments
     which are  necessary  to provide a fair  statement  of the  results for the
     periods  covered.   The  adjustments   consist  only  of  normal  recurring
     adjustments.

3.   Basic  earnings per share is  calculated  by dividing  income  available to
     common  stockholders  by the  weighted  average  number  of  common  shares
     outstanding during the period.  Diluted earnings per share is calculated by
     dividing income  available to common  stockholders by the weighted  average
     number of common shares outstanding plus potentially dilutive shares.

4.   Refer to the  Annual  Report on Form 10-K for the year ended  December  31,
     2000  for  a  summary  of  significant  accounting  policies  and  detailed
     information regarding the financial statements.

5.   The Company  operates  primarily in one business  segment  providing  water
     utility services.

6.   The Company adopted  Statement of Financial  Accounting  Standards No. 133,
     "Accounting for Derivative  Instruments and Hedging  Activities" on January
     1,  2001.  Its  adoption  did not have a material  impact on the  Company's
     financial position or results of operations.

7.   Acquisitions  of two water  systems,  accounted for as asset  purchases and
     adding 375 customers to Washington  Water Service  Company,  a wholly-owned
     subsidiary, were completed in the first quarter. The purchase price for the
     two systems was $428,000.

     The  acquisition  of the 1,100  customer  NISH water  systems  in  Visalia,
     California  was completed as a pooling of interests.  The effect of pooling
     was deemed not to be material,  therefore,  prior year financial statements
     have  not been  restated  and  pro-forma  disclosures  were not  considered
     significant.  The net  equity  of NISH was  recorded  as an  adjustment  to
     retained  earnings as of January 1, 2001.  36,180 common shares were issued
     for NISH which were valued at $899,000.





Item 2

MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS

FORWARD LOOKING STATEMENTS

     This Form 10Q, contains forward-looking  statements intended to qualify for
"safe harbor" within the meaning of the Federal  securities  laws as established
by the Private  Securities  Litigation  Reform Act of 1995.  Such statements are
based on currently available information,  expectations,  estimates, assumptions
and projections,  and management's judgment about California Water Service Group
(Company),  the water utility  industry and general economic  conditions.  Words
such 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:  governmental  and  regulatory  commissions'
decisions, new legislation,  increases in suppliers' prices and the availability
of supplies, changes in environmental compliance requirements, acquisitions, the
ability to successfully  implement business plans, changes in customer water use
patterns and the impact of weather on operating results.  The Company assumes no
obligation to provide public updates of forward-looking statements.

RESULTS OF FIRST QUARTER OPERATIONS

     First quarter net income was $221,000, equivalent to $0.01 per common share
on a diluted  basis  compared to the  $1,533,000  or $0.10 per share earned last
year.  Operating  revenue increased  $314,000 to $47,008,000.  Heavier rain this
year,  especially in our Southern  California  service areas,  caused usage from
existing customers to decline 2%. However, that decline was offset by additional
revenue from rate  increases  and usage by 6,400 new  customers  that were added
since  last  year,  resulting  in the  net  revenue  growth.  Components  of the
operating revenue increase are presented in the following table:

Decreased consumption                                               $(1,065,000)
Rate increases                                                          889,000
Usage by new customers                                                  490,000
                                                                    -----------
     Net revenue increase                                           $   314,000
                                                                    ===========

     Total  operating  expenses were  $43,216,000 in 2001 versus  $41,792,000 in
2000, a 3% increase.

     Water  production  costs,  representing  the  largest  components  of total
operating expenses include purchased water,  purchased power for pump operations
and pump taxes.  Together,  these  costs  accounted  for 38% of total  operating
expenses and increased






3% compared to last year. Well production  provided 47% of the water supply, 53%
was purchased from wholesale suppliers and a small portion was developed through
the Company's surface water treatment plants. The components of water production
costs and the changes from last year are shown in the table below:

                                             First Quarter
                                               2001 Cost               Change
                                              -----------           -----------
Purchased water                               $13,014,000           $   330,000
Purchased power                                 2,432,000               375,000
Pump taxes                                        848,000              (257,000)
                                              -----------           -----------
     Total                                    $16,294,000           $   448,000
                                              ===========           ===========

     The purchased water increase was primarily  attributable to wholesale water
suppliers' rate increases in six California districts. Purchased power increased
due to higher  energy  costs.  Pump taxes  decreased  because of less pumping in
districts where pump taxes are incurred.

     Other operations expense increases resulted from:

o    The impact of a general wage  increase  that was  effective at the start of
     the year,  additional  hours  worked  and  increases  in  related  employee
     benefits.

o    Increased  consultants'  costs in regards to the continuing  enhancement of
     the new computer system.

     Maintenance expense decreased $255,000 due to decreased water treatment and
pump equipment maintenance, and fewer water main repairs.

     Federal and state income taxes decreased  $810,000 because of lower taxable
income.

     Other income was $393,000  this year and $329,000 in 2000.  Two real estate
transactions  involving  $140,000 in pretax  income  were  recorded in the first
quarter. Other real estate transactions are expected to be completed during 2001
that will provide pretax income of over $4 million.

     Interest expense on long-term debt rose $268,000 because of the issuance in
October  2000  of the $20  million,  Series  C  8.15%  senior  notes  that  were
outstanding during the entire quarter this year.

REGULATORY MATTERS

     The Company will review 17 California  Water Service Company  districts for
consideration in filing 2001 general rate applications.  Based on the results of
the review the company  will file  applications  as  appropriate.  General  rate
applications  will be filed in July  2001 with CPUC  decisions  expected  in the
second  quarter of 2002. A rate  increase  application  is  anticipated  for the
Washington operations for early 2002.

     As noted  elsewhere  in this  report,  the  Company  plans to file for rate
recovery of the higher California power costs as soon as the final electric rate
tariffs have been established.






     During 2001,  rate increases are projected to provide about $6.4 million in
new revenue from the following sources:

>    A rate increase  filed by Dominguez  Water Company prior to the merger with
     the Company was  approved by the  California  Public  Utilities  Commission
     (CPUC) in October  2000.  Total new revenue as a result of  increases  from
     these proceeding is estimated at $1,300,000 for 2001.

>    Increased  rates in the  Hawthorne  district will provide  $240,000  during
     2001.

>    Starting late in the second quarter, 2001 after CPUC approval,  new revenue
     from the  general  rate  applications  filed in 2000 for  three  California
     districts is expected to be $1,600,000.

>    The Company filed with the CPUC in May 2001 for recovery of certain general
     office expenses.  If approved,  the 2001 revenue is estimated at $2,500,000
     starting in August 2001.

>    A total of $775,000 in  additional  revenue  from 2001 step rate  increases
     that became effective January 1, 2001 is anticipated.

LIQUIDITY

     Short-term  bank  borrowings  were   $18,500,000  at  March  31,  2001  and
$14,598,000 at December 31, 2000.  Additional short-term bank borrowings will be
necessary  during the second quarter to fund semiannual  long-term debt interest
payments due on May 1, 2001 and the second quarter  dividend  payable on May 15,
2001.  Following those payments,  the Company expects to generate cash flow from
operations to repay a portion of the short-term bank borrowings.

     The first quarter common dividend was paid on February 15, 2001 at $0.27875
per share. This represents a $0.00375 or 1.4% increase in the quarterly dividend
rate from 2000 as  approved  by the Board of  Directors  at their  January  2001
meeting.  Annualized, the 2001 dividend rate is $1.115 per common share compared
to $1.10 in 2000.  Based on the  12-month  earnings per share at March 31, 2001,
the  dividend  payout ratio is 92%. At their April 18, 2001  meeting,  Directors
declared the second quarter  dividend  payable May 15, 2001 to  shareholders  of
record on May 1, 2001. This is the 226th consecutive  quarterly dividend paid by
the Company.

     About 10% of the outstanding shares participate in the reinvestment program
under the Company's Dividend  Reinvestment and Stock Purchase Plan ("Plan").  No
new common shares were issued under the Plan during the quarter. Shares required
for the  dividend  reinvestment  and  stock  purchase  option  of the Plan  were
purchased  on the open market.  Shares are also  purchased on the open market to
fulfill  the  requirements  of  the  Company  sponsored  Employee  Savings  Plan
(401(k)). Purchases for this plan are made on a biweekly basis.

     Book value per common share was $12.88 at March 31, 2001 compared to $12.69
a year earlier.

     During the quarter,  utility plant  expenditures  totaled  $13,405,000  for
additions to and  replacements of utility plant. Of that amount,  $3,457,000 was
funded through the Company's  construction  budget with the remainder  funded by
developers'  contributions






in aid of  construction  and  refundable  advances  for  construction.  The 2001
Company construction budget is $53,900,000.

WATER SUPPLY

     The  Company  believes  that  its  various  sources  of  water  supply  are
sufficient to meet customer demand for the remainder of the year.  Historically,
roughly half of the water source is purchased from wholesale  suppliers with the
other half pumped from wells.  A small portion is developed  through three local
surface treatment plants.

     Storage in state  reservoirs  was 106% of historic  average as of March 23,
2001,  and  groundwater  levels remain  adequate.  While somewhat below historic
average,  the mountain snowpack will provide runoff to streams and reservoirs as
it melts during the summer months.

ACQUISITIONS

     Acquisitions  of two water  systems,  accounted for as asset  purchases and
adding 375  customers to  Washington  Water,  a  wholly-owned  subsidiary of the
Company,  were  completed in the first  quarter.  The purchase price for the two
systems was $428,000.

     The  acquisition  of the 1,100  customer  NISH water  systems  in  Visalia,
California  was completed as a pooling of  interests.  The effect of pooling was
deemed not to be material,  therefore,  prior year financial statements have not
been restated and pro-forma disclosures were not considered significant. The net
equity of NISH was recorded as an adjustment to retained  earnings as of January
1, 2001.  36,180  common  shares  were  issued  for NISH  which  were  valued at
$899,000.

     Combined,  the three  acquisitions  are  expected to provide  approximately
$350,000 in annual revenue.

CALIFORNIA ENERGY SITUATION

     In recent months, the California energy crisis has been well publicized. In
January 2001,  electric rates  increased about 10 percent.  Another  increase of
about 35 percent was approved by the CPUC and is expected to be effective during
the second quarter.  The Company intends to file an application with the CPUC to
recovery the higher  electric rates from customers as soon as the final electric
rate structure is known.

     During the quarter, California experienced several power outages when power
suppliers  implemented rolling electric blackouts due to supply shortages.  This
summer,  additional periods of electric blackouts are expected.  The Company has
taken  action  for such  situations  in  order  to  continue  water  service  to
customers.  Many wellsites are equipped with emergency electric generators.  The
generators are designed to produce  electricity to keep wells  operating  during
power outages.  Storage tanks also provide  customers with water during blackout
periods.


ACCOUNTING PRONOUNCEMENTS

     No  accounting  pronouncements  were issued or effective  during the period
that would have a  significant  impact on the  Company,  however,  Statement  of
Financial Accounting  Standards No. 133, "Accounting for Derivative  Instruments
and Hedging Activities" was adopted on January 1, 2001.

MARKET RISK

     The  Company  does  not  hold,  trade  in  or  issue  derivative  financial
instruments and therefore is not exposed to risks these instruments present.

     The Company's  market risk to interest rate exposure is limited because the
cost of long-term  financing,  including interest costs, are covered in consumer
water rates as approved by the  Commission.  The Company  does not have  foreign
operations, therefore, it does not have a foreign currency exchange risk.

     The Company's  sensitivity to commodity  prices is most affected by changes
in purchased water and purchased power costs. Through the Commission's balancing
account  procedures,  increases in purchased water and purchased power costs can
be passed on to consumers.  The Company  manages other  commodity price exposure
through the duration and terms of its vendor contracts.


PART II OTHER INFORMATION

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

(a)  The annual meeting of  stockholders  of California  Water Service Group was
     held on April  18,  2001 at the  Company's  executive  office  in San Jose,
     California.  As proposed in the 2001 Proxy,  the election of directors  and
     confirmation  of KPMG LLP to serve as  independent  auditors  for 2001 were
     approved by stockholders at the meeting.

(b)  At the annual  stockholders  meeting, a Board of Directors to serve for the
     ensuing  year  was  elected.   The  following  directors  were  elected  as
     nominated:

              Douglas M. Brown                 Robert W. Foy
              Edward D. Harris, Jr. M.D.       Robert K. Jaedicke
              Richard P. Magnuson              Linda R. Meier






              Peter C. Nelson                  Langdon W. Owen
              George A. Vera

(c)  Two proposals  were voted on at the meeting:  (1) election of directors for
     the ensuing  year,  and (2)  ratification  of the  selection of KPMG LLP as
     independent auditors for 2001.

(1)  Tabulation of the votes for the election of directors was:

                                                      For                Against
                                                   ----------            -------
Douglas M. Brown                                   13,892,197            171,402
Robert W. Foy                                      12,955,436            171,402
Edward D. Harris, Jr. M.D                          13,893,894            171,402
Robert K. Jaedicke                                 13,875,169            171,402
Richard P. Magnuson                                13,903,012            172,202
Linda R. Meier                                     13,868,808            171,402
Peter C. Nelson                                    12,949,509            173,706
Langdon W. Owen                                    13,885,153            172,202
George A. Vera                                     13,894,987            171,402

(2)  The Directors'  selection of KPMG LLP to serve as independent  auditors for
     2001 was  ratified  by the  stockholders.  There were  13,642,844  votes in
     favor, 100,979 against and 120,585 abstentions.


PART II           OTHER INFORMATION

Item 6. Exhibits and Reports on Form 8-K

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

None





                                   SIGNATURES

     Pursuant to the requirement of the Securities and Exchange Act of 1934, the
     Registrant  has duly  caused  this report to be signed on its behalf by the
     authorized undersigned.


                         CALIFORNIA WATER SERVICE GROUP
                                   Registrant

April 30, 2001

                              /s/ Gerald F. Feeney
                                Gerald F. Feeney
                     Vice President, Chief Financial Officer
                                  and Treasurer