EXHIBIT 99.1


[CALIFORNIA WATER                                                       [CWT
  SERVICE GROUP                                                        LISTED
      LOGO]                                                           NYSE LOGO]

                                  NEWS RELEASE
                         CALIFORNIA WATER SERVICE GROUP


             1720 North First Street
             San Jose, CA 95112-4598                            October 27, 2004
                                                           For Immediate Release
Contact:     Richard D. Nye    (408) 367-8216 (analysts)
             Shannon Dean (310) 257-1435 (media)

                 CAL WATER ANNOUNCES THIRD QUARTER 2004 RESULTS;
               BOARD DECLARES 240TH CONSECUTIVE QUARTERLY DIVIDEND
- --------------------------------------------------------------------------------

SAN JOSE, CA - California Water Service Group (NYSE : CWT) today announced net
income of $10.8 million and earnings of $0.59 per share for the third quarter of
2004, compared to net income of $8.6 million and earnings of $0.53 per share in
the third quarter of 2003.

         Revenue for the third quarter increased $8.9 million,  or 10%, to $97.1
million.  Rate  increases  added $9.9  million to  revenue,  while  sales to new
customers added $1.3 million.  Partially  offsetting these higher revenues was a
3%, or $2.3  million,  decrease in sales to existing  customers  compared to the
same period last year.

         Total  operating  expenses for the third quarter  increased 9%, or $6.9
million.  Water production costs increased 3% due to rate increases by wholesale
water suppliers.  Other operations  expenses  increased by 14%. For the quarter,
the Company experienced  unexpected cost increases from higher claims for health
benefits and workers'  compensation.  Both of these  programs are basically self
insured with stop loss insurance coverage for extraordinary claims. In addition,



costs   increases  were  incurred  to  comply  with  the  Sarbanes  Oxley  (SOX)
requirements on internal controls. SOX costs have increased more than originally
estimated.  Areas of cost increases that were in line with internal expectations
were  depreciation  and property  taxes due to capital  investments,  and higher
income taxes driven by the higher  taxable  income.

     "Our third quarter results were good.  Although we had some unexpected cost
increases  for health  benefits and  workers'  compensation  claims,  net income
increased 26% over last year," said President and Chief Executive  Officer Peter
C. Nelson.

     "Also,  we are very  pleased  to  announce  that we have  prevailed  in our
efforts  to stop the City of Selma from  taking  over our Selma  water  system,"
Nelson said.

     At a public  hearing on October  18,  2004,  the Selma City  Council  voted
unanimously to abandon efforts to acquire Cal Water's Selma system.  Hundreds of
customers made calls, signed petitions,  wrote letters,  and attended the public
hearing to speak on the Company's behalf.

     The Company will also pay its 240th  consecutive  dividend.  On October 27,
2004, Directors declared a dividend of $0.2825 on common stock. It is payable on
November 19, 2004, to  stockholders  of record on November 8, 2004.  The regular
dividend on Series C preferred stock was also declared.

     Investors  are invited to listen to the Company's  analyst  teleconference,
which is scheduled  for 4:00 p.m.  EDT / 1:00 p.m. PDT on October 28, 2004.  The


call-in number is 1-866-244-4742 and the ID No. is 558049. A replay is available
through  January 26, 2005,  by calling  1-888-266-2081  and  entering  pass code
558049.

     California  Water Service Group is the parent  company of California  Water
Service  Company,  Washington  Water Service  Company,  New Mexico Water Service
Company, Hawaii Water Service Company, Inc., and CWS Utility Services.  Together
these companies provide regulated and non-regulated water service to more than 2
million  people  in  100  California,   Washington,   New  Mexico,   and  Hawaii
communities.  Group's  common stock trades on the New York Stock  Exchange under
the symbol "CWT."

     This news release contains  forward-looking  statements  within the meaning
established by the Private Securities Litigation Reform Act of 1995 ("Act"). The
forward-looking  statements  are  intended to qualify  under  provisions  of the
federal  securities  laws for "safe harbor"  treatment  established  by the Act.
Forward-looking   statements  are  based  on  currently  available  information,
expectations,  estimates, assumptions and projections, and management's judgment
about the Company,  the water utility industry and general economic  conditions.
Such  words  as  expects,   intends,   plans,  believes,   estimates,   assumes,
anticipates,  projects,  predicts,  forecasts  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.  They are
subject to  uncertainty  and changes in  circumstances.  Actual results may vary
materially from what is contained in a forward-looking  statement.  Factors that
may cause a result different than expected or anticipated include:  governmental
and  regulatory  commissions'  decisions;  changes  in  regulatory  commissions'
policies and  procedures;  the  timeliness  of regulatory  commissions'  actions
concerning rate relief;  new  legislation;  the ability to satisfy  requirements
related to the Sarbanes  Oxley Act section 404 and other  regulation on internal
controls;  electric power interruptions;  increases in suppliers' prices and the
availability  of supplies  including  water and power;  fluctuations in interest
rates;  changes in  environmental  compliance  and water  quality  requirements;
acquisitions and our ability to successfully  integrate acquired companies;  the



ability to successfully  implement business plans; changes in customer water use
patterns; the impact of weather on water sales and operating results;  access to
sufficient  capital on  satisfactory  terms;  civil  disturbances  or  terrorist
threats or acts, or apprehension  about the possible future  occurrences of acts
of this type; the involvement of the United States in war or other  hostilities;
restrictive  covenants  in or changes to the  credit  ratings on our  current or
future debt that could  increase  our  financing  costs or affect our ability to
borrow, make payments on debt or pay dividends;  and, other risks and unforeseen
events. When considering forward-looking statements, you should keep in mind the
cautionary  statements  included  in this  paragraph.  The  Company  assumes  no
obligation to provide public updates of forward-looking  statements.

     Additional    information    is    available    at   our   Web    site   at
www.calwatergroup.com.

     Attachments (3).

                                      ###





CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED BALANCE SHEET
Unaudited
(In thousands, except per share data)                                                         September 30,             December 31,
                                                                                                  2004                     2003
                                                                                               -----------              -----------
                                                                                                                  
ASSETS
Utility plant:
           Utility plant                                                                       $ 1,124,938              $ 1,078,975
           Less accumulated depreciation and amortization                                          337,766                  319,477
                                                                                               -----------              -----------
                   Net utility plant                                                               787,172                  759,498
                                                                                               -----------              -----------

Current assets:
           Cash and cash equivalents                                                                31,322                    2,856
           Customer receivables                                                                     23,950                   18,434
           Other receivables                                                                         4,881                    5,125
           Unbilled revenue                                                                         12,906                    8,522
           Materials and supplies                                                                    3,276                    2,957
           Taxes and other prepaid expenses                                                          5,458                    5,609
                                                                                               -----------              -----------
                   Total current assets                                                             81,793                   43,503
                                                                                               -----------              -----------

Regulatory assets                                                                                   55,398                   53,326
Other assets                                                                                        18,571                   16,708
                                                                                               -----------              -----------
                                                                                               $   942,934              $   873,035
                                                                                               ===========              ===========

CAPITALIZATION AND LIABILITIES
Capitalization:
           Common stock, $.01 par value                                                        $       183              $       169
           Additional paid-in capital                                                              130,647                   93,748
           Retained earnings                                                                       158,333                  150,908
           Accumulated other comprehensive loss                                                       (301)                    (301)
                                                                                               -----------              -----------
                   Total common stockholders' equity                                               288,862                  244,524
           Preferred stock                                                                           3,475                    3,475
           Long-term debt, less current maturities                                                 271,895                  272,226
                                                                                               -----------              -----------
                   Total capitalization                                                            564,232                  520,225
                                                                                               -----------              -----------

Current liabilities:
           Current maturities of long-term debt                                                        857                      904
           Short-term borrowings                                                                      --                      6,454
           Accounts payable                                                                         26,779                   23,776
           Accrued expenses and other liabilities                                                   37,373                   32,430
                                                                                               -----------              -----------
                   Total current liabilities                                                        65,009                   63,564


Unamortized investment tax credits                                                                   2,925                    2,925
Deferred income taxes                                                                               50,182                   38,005
Regulatory and other liabilities                                                                    37,967                   35,835
Advances for construction                                                                          129,008                  121,952
Contributions in aid of construction                                                                93,611                   90,529
Commitments and contingencies                                                                         --                       --
                                                                                               -----------              -----------
                                                                                               $   942,934              $   873,035
                                                                                               ===========              ===========




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


For the three months ended:                                                                   September 30,            September 30,
                                                                                                  2004                    2003
                                                                                                --------                --------
                                                                                                                  
Operating revenue                                                                               $ 97,104                $ 88,197
                                                                                                --------                --------
Operating expenses:
     Operations                                                                                   62,456                  58,398
     Maintenance                                                                                   3,640                   3,172
     Depreciation and amortization                                                                 6,518                   5,830
     Income taxes                                                                                  7,050                   5,587
     Property and other taxes                                                                      2,942                   2,691
                                                                                                --------                --------
        Total operating expenses                                                                  82,606                  75,678
                                                                                                --------                --------

        Net operating income                                                                      14,498                  12,519
                                                                                                --------                --------

Other income and expenses:
        Non-regulated income, net                                                                    650                     623
        Gain on sale of non-utility property                                                           6                      24
                                                                                                --------                --------
        Total other income and expenses                                                              656                     647
                                                                                                --------                --------

Interest expense:
     Interest expense                                                                              4,615                   4,879
     Less capitalized interest                                                                       250                     300
                                                                                                --------                --------
        Total interest expense                                                                     4,365                   4,579
                                                                                                --------                --------

Net income                                                                                       $10,789                 $ 8,587
                                                                                                ========                ========

Earnings per share
     Basic                                                                                       $  0.59                 $  0.53
                                                                                                ========                ========
     Diluted                                                                                     $  0.59                 $  0.53
                                                                                                ========                ========
Weighted average shares outstanding
     Basic                                                                                        18,345                  16,209
                                                                                                ========                ========
     Diluted                                                                                      18,360                  16,222
                                                                                                ========                ========
Dividends per share of common stock                                                             $0.28250                $0.28125
                                                                                                ========                ========





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


For the nine months ended:                                                                   September 30,            September 30,
                                                                                                 2004                     2003
                                                                                               --------                 --------
                                                                                                                  
Operating revenue                                                                              $246,189                 $207,502
                                                                                               --------                 --------
Operating expenses:
     Operations                                                                                 159,404                  141,851
     Maintenance                                                                                  9,853                    9,488
     Depreciation and amortization                                                               19,557                   17,428
     Income taxes                                                                                14,852                    8,348
     Property and other taxes                                                                     8,551                    7,694
                                                                                               --------                 --------
        Total operating expenses                                                                212,217                  184,809
                                                                                               --------                 --------

        Net operating income                                                                     33,972                   22,693
                                                                                               --------                 --------

Other income and expenses:
        Non-regulated income, net                                                                 1,773                    1,792
        Gain on sale of non-utility property                                                          7                    1,535
                                                                                               --------                 --------
        Total other income and expenses                                                           1,780                    3,327
                                                                                               --------                 --------

Interest expense:
     Interest expense                                                                            14,013                   14,826
     Less capitalized interest                                                                      550                    1,210
                                                                                               --------                 --------
        Total interest expense                                                                   13,463                   13,616
                                                                                               --------                 --------

Net income                                                                                     $ 22,289                 $ 12,404
                                                                                               ========                 ========
Earnings per share
     Basic                                                                                     $   1.27                 $   0.79
                                                                                               ========                 ========
     Diluted
                                                                                               $   1.27                 $   0.79
                                                                                               ========                 ========
Weighted average shares outstanding
     Basic                                                                                       17,418                   15,528
                                                                                               ========                 ========
     Diluted
                                                                                                 17,433                   15,539
                                                                                               ========                 ========
Dividends per share of common stock
                                                                                               $0.84750                 $0.84375
                                                                                               ========                 ========