Exhibit 99

[GRAPHIC OMITTED]                                               [OBJECT OMITTED]
                                  NEWS RELEASE

                         CALIFORNIA WATER SERVICE GROUP

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

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

                 CAL WATER ANNOUNCES FIRST QUARTER 2004 RESULTS;
               BOARD DECLARES 238TH CONSECUTIVE QUARTERLY DIVIDEND

- --------------------------------------------------------------------------------

SAN JOSE, CA - California  Water Service Group (NYSE : CWT) today  announced net
income  of $1.4  million  or $0.08 per  share  for the  first  quarter  of 2004,
compared  to a loss of $0.8  million or $0.05 per share in the first  quarter of
2003.
         Revenue for the first  quarter  increased  $8.9 million or 17% to $60.2
million. Rate increases added $7.0 million to revenue and sales to new customers
added $1.6 million. Sales to existing customers were slightly higher, increasing
$0.3 million over the same period last year.

         According to President  and Chief  Executive  Officer  Peter C. Nelson,
first quarter 2004 results were favorably impacted by rate increases  authorized
by the California Public Utilities  Commission (CPUC) late in 2003 and the first
quarter of 2004 and the addition of customers.

         "We are seeing the impact of rate decisions received last year and this
year.  While the first quarter is traditionally a low earnings period for us due
to weather and its impact on sales,  we are pleased  with the  earnings  for the
quarter. We will continue to be



persistent  and  diligent in our efforts to secure  fair  regulatory  treatment,
because that will be key to our continued success," Nelson said.

         In February,  the Company  received  approval from the CPUC to increase
rates in its  Stockton  District  by  approximately  $0.7  million per year as a
result of rate increases by the district's  wholesale water supplier;  in April,
the CPUC  approved the Company's  General Rate Cases for 4 districts  from 2002,
which will increase rates by approximately $3.5 million annually.

         Total operating  expenses for the first quarter  increased 13%, or $6.2
million.  Water production costs increased 12%,  primarily due to rate increases
by wholesale  water  suppliers in several  districts.  Other cost increases were
payroll, health care, pension, insurance,  settlements of property damage claims
and income taxes.  Depreciation  expense  increased 13% due to increases in 2003
capital expenditures.

         Maintenance  expense  declined by 2% for the quarter.  Interest expense
also declined  slightly as a result of  refinancing  part of the Company's  long
term debt and lower  short-term  borrowings.  There was no impact from  property
sales for the  first  quarter  compared  to gains of $0.6  million  in the first
quarter of 2003.

         At their  meeting  today,  Directors  declared  the  238th  consecutive
quarterly  dividend on common  stock in the amount of $0.2825  per share.  It is
payable on May 21, 2004, to  stockholders of record on May 10, 2004. The regular
dividend on Series C preferred stock was also declared.

         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, Hawaii and New Mexico 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; 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 (2).

                                       ###



CALIFORNIA WATER SERVICE GROUP
CONDENSED CONSOLIDATED BALANCE SHEETS
Unaudited



(In thousands, except per share data)                       March 31,    December 31,
                                                              2004           2003
                                                              ----           ----
                                                                   
ASSETS
Utility plant:
         Utility plant                                    $ 1,089,894    $ 1,078,975
         Less accumulated depreciation and amortization       326,361        319,477
                                                          -----------    -----------
                 Net utility plant                            763,533        759,498
                                                          -----------    -----------

Current assets:
         Cash and cash equivalents                              2,086          2,856
         Receivables                                           19,198         23,559
         Unbilled revenue                                       8,115          8,522
         Materials and supplies at average cost                 2,875          2,957
         Taxes and other prepaid expenses                       6,258          5,609
                                                          -----------    -----------
                 Total current assets                          38,532         43,503
                                                          -----------    -----------

Other assets:
         Regulatory assets                                     53,710         53,326
         Other assets                                          18,127         16,708
                                                          -----------    -----------
                 Total other assets                            71,837         70,034
                                                          -----------    -----------
                                                          $   873,902    $   873,035
                                                          ===========    ===========

CAPITALIZATION AND LIABILITIES
Capitalization:
         Common stock, $.01 par value                     $       169    $       169
         Additional paid-in capital                            93,748         93,748
         Retained earnings                                    147,533        150,908
         Accumulated other comprehensive loss                    (301)          (301)
                                                          -----------    -----------
                 Total common stockholders' equity            241,149        244,524
         Preferred stock                                        3,475          3,475
         Long-term debt, less current maturities              272,042        272,226
                                                          -----------    -----------
                 Total capitalization                         516,666        520,225
                                                          -----------    -----------

Current liabilities:
         Current maturities of long-term debt                     904            904
         Short-term borrowings                                  9,800          6,454
         Accounts payable                                      18,264         23,776
         Accrued expenses and other liabilities                36,606         32,430
                                                          -----------    -----------
                 Total current liabilities                     65,574         63,564

Unamortized investment tax credits                              2,925          2,925
Deferred income taxes                                          38,161         38,005
Regulatory and other liabilities                               35,888         35,835
Advances for construction                                     123,372        121,952
Contributions in aid of construction                           91,316         90,529
Commitments and contingencies
                                                          -----------    -----------
                                                          $   873,902    $   873,035
                                                          ===========    ===========




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

For the three months ended:                                 March 31,  March 31,
                                                              2004       2003
                                                              ----       ----

Operating revenue                                           $ 60,240   $ 51,310
                                                            --------   --------
Operating expenses:
        Operations                                            41,498     37,761
        Maintenance                                            3,181      3,253
        Depreciation and amortization                          6,518      5,760
        Income taxes                                             958       (553)
        Property and other taxes                               2,694      2,465
                                                            --------   --------
              Total operating expenses                        54,849     48,686
                                                            --------   --------

              Net operating income                             5,391      2,624
                                                            --------   --------

Other income and expenses:
              Non-regulated income, net                          550        612
              Gain on sale of non-utility property                 1        552
                                                            --------   --------
                                                                 551      1,164
                                                            --------   --------

              Income before interest expense                   5,942      3,788
                                                            --------   --------

Interest expense:
        Interest Expense                                       4,646      4,856
        Less: Capitalized Interest                               150        300
                                                            --------   --------
              Total interest expense                           4,496      4,556
                                                            --------   --------

Net income (loss)                                           $  1,446   $   (768)
                                                            ========   ========

Earnings per share
        Basic                                               $   0.08   $  (0.05)
                                                            ========   ========
        Diluted                                             $   0.08   $  (0.05)
                                                            ========   ========
Weighted average shares outstanding
        Basic                                                 16,932     15,182
                                                            ========   ========
        Diluted                                               16,953     15,182
                                                            ========   ========
Dividends per share of common stock                         $0.28250   $0.28125
                                                            ========   ========