Exhibit 99

[CALIFORNIA WATER SERVICE GROUP LOGO]

                                                          [CWT Listed NYSE Logo]

                                  NEWS RELEASE
                         CALIFORNIA WATER SERVICE GROUP

             1720 North First Street
             San Jose, CA 95112-4598                               July 28, 2004
                                                           For Immediate Release

Contact:     Richard D. Nye    (408) 367-8216 (analysts)
             Shannon Dean (310) 257-1435 (media)

                CAL WATER ANNOUNCES SECOND QUARTER 2004 RESULTS;
               BOARD DECLARES 239TH CONSECUTIVE QUARTERLY DIVIDEND
- --------------------------------------------------------------------------------

SAN JOSE, CA - California  Water Service Group (NYSE : CWT) today  announced net
income of $10.1  million and earnings of $0.59 per share for the second  quarter
of 2004,  compared to net income of $4.6 million and earnings of $0.30 per share
in the second quarter of 2003.

         Revenue for the second  quarter  increased  $20.8  million,  or 31%, to
$88.8  million.  Rate  increases  added $9.7 million to revenue and sales to new
customers  added $1.7  million.  Sales to existing  customers  were also higher,
increasing $9.4 million over the same period last year.

         Total operating expenses for the second quarter increased 24%, or $14.3
million.  Water production costs increased 28%, primarily due to increased water
usage and rate increases by wholesale water suppliers. Other operations expenses
increased by 12% as a result of increased costs for water treatment,  insurance,
labor,  regulatory fees, and employee benefits.  Depreciation  expense increased
12% due to increases in 2003 capital  expenditures.  Income tax expense  doubled
due to the higher pre-tax income.

         There was no effect from property sales for the current quarter,  while
gains of $1.0 million were posted in the second quarter of 2003.

         "Our second  quarter water sales were  positively  affected by hot, dry
weather,  which  increased  sales  over the same  period  last year.  Also,  our

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improved  results  reflected rate relief we received from the California  Public
Utilities  Commission,"  said  President  and Chief  Executive  Officer Peter C.
Nelson.

         On July 8, 2004, the California Public Utilities  Commission (CPUC), in
approving a rate increase of $1.1 million for the Salinas  district,  found that
the Company should be fined $75,000 and reduced the return on equity by 50 basis
points  for the  Salinas  district  as a  result  of the  Company  not  properly
reporting the  acquisition of three small water systems.  The time frame for the
return on equity  reduction is expected to be one year.  The  decision  closes a
proceeding in which the CPUC's Office of Ratepayer  Advocates had  recommended a
penalty of nearly $10 million for the reporting error.

         Including the Salinas decision,  the CPUC has authorized rate increases
totaling approximately $10 million in annual revenues year-to-date.

         At their  meeting  today,  Directors  declared  the  239th  consecutive
quarterly  dividend on common  stock in the amount of $0.2825.  It is payable on
August  20,  2004,  to  stockholders  of record on August 9, 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 July 29,
2004. The call-in number is 1-866-206-5917 and the ID No. is 485611. A replay is
available  through August 5, 2004, by calling  1-888-266-2081  and entering pass
code 485611.

         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,


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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).

                                      ###

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CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED BALANCE SHEET
Unaudited
(In thousands, except per share data)                  June 30,     December 31,
                                                         2004          2003
                                                     -----------    -----------
ASSETS
Utility plant:
        Utility plant                                $ 1,106,534    $ 1,078,975
        Less accumulated depreciation
          and amortization                               331,150        319,477
                                                     -----------    -----------
              Net utility plant                          775,384        759,498
                                                     -----------    -----------

Current assets:
        Cash and cash equivalents                         24,109          2,856
        Customer receivables                              23,095         18,434
        Other receivables                                 13,608          5,125
        Unbilled revenue                                  13,108          8,522
        Materials and supplies                             3,225          2,957
        Taxes and other prepaid expenses                   6,934          5,609
                                                     -----------    -----------
              Total current assets                        84,079         43,503
                                                     -----------    -----------

Regulatory assets                                         54,747         53,326
Other assets                                              18,228         16,708
                                                     -----------    -----------
                                                     $   932,438    $   873,035
                                                     ===========    ===========

CAPITALIZATION AND LIABILITIES
Capitalization:
        Common stock, $.01 par value                 $       183    $       169
        Additional paid-in capital                       130,636         93,748
        Retained earnings                                152,764        150,908
        Accumulated other comprehensive loss                (301)          (301)
                                                     -----------    -----------
              Total common stockholders' equity          283,282        244,524
        Preferred stock                                    3,475          3,475
        Long-term debt, less current maturities          271,968        272,226
                                                     -----------    -----------
              Total capitalization                       558,725        520,225
                                                     -----------    -----------

Current liabilities:
        Current maturities of long-term debt                 846            904
        Short-term borrowings                               --            6,454
        Accounts payable                                  28,624         23,776
        Accrued expenses and other liabilities            36,406         32,430
                                                     -----------    -----------
              Total current liabilities                   65,876         63,564

Unamortized investment tax credits                         2,925          2,925
Deferred income taxes                                     48,144         38,005
Regulatory and other liabilities                          38,100         35,835
Advances for construction                                126,642        121,952
Contributions in aid of construction                      92,026         90,529
Commitments and contingencies                               --             --
                                                     -----------    -----------
                                                     $   932,438    $   873,035
                                                     ===========    ===========

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

For the three months ended:                                  June 30,   June 30,
                                                               2004      2003
                                                             -------    --------

Operating revenue                                             88,845    $67,994
                                                             -------    --------
Operating expenses:
      Operations                                              55,450     45,693
      Maintenance                                              3,032      3,063
      Depreciation and amortization                            6,521      5,838
      Income taxes                                             6,844      3,314
      Property and other taxes                                 2,915      2,538
                                                             -------    --------
           Total operating expenses                           74,762     60,446
                                                             -------    --------

           Net operating income                               14,083      7,548
                                                             -------    --------

Other income and expenses:
           Non-regulated income, net                             573        559
           Gain on sale of non-utility property                    0        958
                                                             -------    --------
           Total other income and expenses                       573      1,517

Interest expense:
      Interest expense                                         4,752      5,090
      Less capitalized interest                                  150        610
                                                             -------    --------
           Total interest expense                              4,602      4,480

Net income                                                    10,054    $ 4,585
                                                             =======    ========

Earnings per share
      Basic                                                     0.59    $  0.30
                                                             =======    ========
      Diluted                                                   0.59    $  0.30
                                                             =======    =======
Weighted average shares outstanding
      Basic                                                   16,965     15,182
                                                             =======    ========
      Diluted                                                 16,983     15,198
                                                             =======    ========
Dividends per share of common stock                          0.28250    $0.28125
                                                             =======    ========

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

For the six months ended:                                  June 30,     June 30,
                                                             2004         2003
                                                           --------     --------

Operating revenue                                          $149,085     $119,305
                                                           --------     --------
Operating expenses:
      Operations                                             96,948       83,453
      Maintenance                                             6,213        6,316
      Depreciation and amortization                          13,039       11,598
      Income taxes                                            7,802        2,761
      Property and other taxes                                5,609        5,003
                                                           --------     --------
           Total operating expenses                         129,611      109,131
                                                           --------     --------

           Net operating income                              19,474       10,174
                                                           --------     --------

Other income and expenses:
           Non-regulated income, net                          1,123        1,169
           Gain on sale of non-utility property                   1        1,511
                                                           --------     --------
           Total other income and expenses                    1,124        2,680

Interest expense:
      Interest expense                                        9,398        9,947
      Less capitalized interest                                 300          910
                                                           --------     --------
           Total interest expense                             9,098        9,037

Net income                                                 $ 11,500     $  3,817
                                                           ========     ========

Earnings per share
      Basic                                                $   0.67     $   0.25
                                                           ========     ========
      Diluted                                              $   0.67     $   0.25
                                                           ========     ========
Weighted average shares outstanding
      Basic                                                  16,949       15,182
                                                           ========     ========
      Diluted                                                16,967       15,191
                                                           ========     ========
Dividends per share of common stock                        $0.56500     $0.56250
                                                           ========     ========


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