UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K


                                 CURRENT REPORT

    Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934


Date of report (Date of earliest event reported)        April 27, 2005
                                                  ------------------------------



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



         Delaware                       1-13883                  77-0448994
--------------------------------------------------------------------------------
(State or other jurisdiction          (Commission            (I.R.S. Employer
     of incorporation)                File Number)           Identification No.)


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

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


                                 Not Applicable
--------------------------------------------------------------------------------
         (Former name or former address, if changed since last report)


Check  the  appropriate  box  below  if the  form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

[_]  Written  communications  pursuant to Rule 425 under the  Securities Act (17
     CFR 230.425)

[_]  Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
     240.14a-12)

[_]  Pre-commencement   communications  pursuant  to  Rule  14d-2(b)  under  the
     Exchange Act (17 CFR 240.14d-2(b))

[_]  Pre-commencement  communications  pursuant  to Rule  13e-4(c  )  under  the
     Exchange Act (17 CFR 240.13e-4(c)





Item 2.02 Results of Operations and Financial Condition.

         On April 27, 2005, the registrant  issued the press release attached to
this report as Exhibit 99, which  announces  the results of  operations  for the
first quarter of 2005.



Item 9.01 Financial Statements and Exhibits.

(c) Exhibits.

         The  list of  exhibits  called  for by this  Item  is  incorporated  by
reference to the exhibit index to this report.










                                   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
undersigned hereunto duly authorized.



                                         CALIFORNIA WATER SERVICE GROUP
                                                   (Registrant)



Date: April 28, 2005                     By:      /s/ Richard D. Nye
                                              ----------------------------------
                                                      Richard D. Nye
                                                      Vice President,
                                                      Chief Financial Officer
                                                      and Treasurer









                                  Exhibit Index


Exhibit No.                                 Description
-----------                                 -----------

99                Press  release of the  registrant  dated  April 27, 2005 which
                  announces the results of  operations  for the first quarter of
                  2005.




CALIFORNIA
  WATER
 SERVICE
  GROUP
  LOGO


                                  NEWS RELEASE
                         CALIFORNIA WATER SERVICE GROUP



             1720 North First Street
             San Jose, CA 95112-4598                              April 27, 2005
                                                           For Immediate Release
Contact:     Richard Nye    (408) 367-8216 (analysts)
             Shannon Dean (310) 257-1435 (media)

                 CAL WATER ANNOUNCES FIRST QUARTER 2005 RESULTS;
               BOARD DECLARES 242nd CONSECUTIVE QUARTERLY DIVIDEND
--------------------------------------------------------------------------------

SAN JOSE, CA - California  Water Service Group (NYSE : CWT) today  announced net
income of $0.7 million and earnings of $0.03 per share for the first  quarter of
2005,  compared  to net  income of $1.4  million or $0.08 per share in the first
quarter of 2004.

         Revenue  was  basically  flat for the  quarter at $60.3  million.  Rate
increases  added $2.0 million to revenue and sales to new  customers  added $0.8
million,  but higher  than  average  precipitation  resulted  in a $2.8  million
decline in sales to existing customers.

         According to President  and Chief  Executive  Officer  Peter C. Nelson,
first  quarter  2005 results were lower  principally  due to reduced  usage from
higher  rainfall.  In addition,  significant  credits were received from certain
wholesale  suppliers in the first quarter of 2004 which were not received in the
first quarter of 2005.

         "The first quarter is typically a low earnings period for us because of
the  weather,  and we  experienced  heavy  rainfall in the  Southern  California
districts,"  Nelson said. "Our continued  efforts to secure fair and timely rate
relief,  add  customers,  and  operate  efficiently  will  be  critical  to  our
performance for the year," he said.




         Total operating expenses for the first quarter of 2005 increased 2%, or
$1.0 million.  Water  production  costs decreased by $1.3 million or 6%, because
less water was  produced as a result of higher  rainfall.  Included in the first
quarter of 2004 was a credit received from certain  wholesale water suppliers in
Southern  California for $1.4 million and a charge for $0.8 million to resolve a
meter reading  malfunction matter in the Stockton  district.  First quarter 2005
water production costs did not contain similar items.

         Excluding water production costs,  other operations  expenses increased
$1.6  million  or 8%.  The  increased  expenses  were  primarily  due  to  costs
associated with payroll, medical claims, pension, and outside services.

         Maintenance expense increased $0.5 million, or 15%, for the quarter due
to higher  repair costs for mains and pumping  equipment.  Depreciation  expense
increased $0.5 million,  or 7%, due to 2004 capital  expenditures.  Income taxes
were lower by $0.5 million,  or 53%, due to lower taxable  income.  Property and
other taxes increased $0.3 million or 10%.

         At their  meeting  today,  Directors  declared  the  242nd  consecutive
quarterly  dividend on common stock. The quarterly dividend of $0.285 is payable
on May 20, 2005, to stockholders of record on May 9, 2005. 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, 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, including decisions on proper disposition
of property;  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 and other regulations 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.  For  additional  information  relating to the risks of the Company's
business see "Risk  Factors" in the Company's  Annual  Report on Form 10-K.  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,
                                                                                                  2005                     2004
                                                                                               -----------              -----------
                                                                                                                  
ASSETS
Utility plant:
         Utility plant                                                                         $ 1,160,399              $ 1,144,074
         Less accumulated depreciation and amortization                                            350,884                  343,769
                                                                                               -----------              -----------
               Net utility plant                                                                   809,515                  800,305
                                                                                               -----------              -----------
Current assets:
         Cash and cash equivalents                                                                  28,298                   18,820
         Receivables:
                    Customers                                                                       13,626                   15,867
                    Income taxes                                                                      --                      7,298
                    Other                                                                            3,422                    3,147
         Unbilled revenue                                                                            8,391                    9,307
         Materials and supplies at average cost                                                      3,396                    3,161
         Prepaid pension expense                                                                     1,976                    3,671
         Taxes and other prepaid expenses                                                            7,866                    9,122
                                                                                               -----------              -----------
                 Total current assets                                                               66,975                   70,393
                                                                                               -----------              -----------
Regulatory assets                                                                                   54,325                   53,477
Other assets                                                                                        19,575                   18,678
                                                                                               -----------              -----------
                                                                                               $   950,390              $   942,853
                                                                                               ===========              ===========
CAPITALIZATION AND LIABILITIES
Capitalization:
         Common stock, $.01 par value                                                          $       184              $       184
         Additional paid-in capital                                                                131,418                  131,271
         Retained earnings                                                                         152,257                  156,851
         Accumulated other comprehensive loss                                                         (701)                    (701)
                                                                                               -----------              -----------
               Total common stockholders' equity                                                   283,158                  287,605
         Preferred stock                                                                             3,475                    3,475
         Long-term debt, less current maturities                                                   274,414                  274,821
                                                                                               -----------              -----------
               Total capitalization                                                                561,047                  565,901
                                                                                               -----------              -----------
Current liabilities:
         Current maturities of long-term debt                                                        1,100                    1,100
         Short-term borrowings                                                                        --                       --
         Accounts payable                                                                           23,134                   19,745
         Accrued expenses and other liabilities                                                     42,545                   36,367
                                                                                               -----------              -----------
               Total current liabilities                                                            66,779                   57,212

Unamortized investment tax credits                                                                   2,721                    2,721
Deferred income taxes                                                                               54,555                   54,826
Regulatory and other liabilities                                                                    36,072                   35,986
Advances for construction                                                                          133,906                  131,292
Contributions in aid of construction                                                                95,310                   94,915
Commitments and contingencies                                                                         --                       --
                                                                                               -----------              -----------
                                                                                               $   950,390              $   942,853
                                                                                               ===========              ===========




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,
                                                                                                   2005                    2004
                                                                                               -----------              -----------
                                                                                                                  
Operating revenue                                                                              $    60,303              $    60,240
                                                                                               -----------              -----------
Operating expenses:
     Water production costs                                                                         19,821                   21,161
     Other operations                                                                               21,943                   20,337
     Maintenance                                                                                     3,658                    3,181
     Depreciation and amortization                                                                   6,996                    6,518
     Income taxes                                                                                      455                      958
     Property and other taxes                                                                        2,965                    2,694
                                                                                               -----------              -----------
            Total operating expenses                                                                55,838                   54,849
                                                                                               -----------              -----------

            Net operating income                                                                     4,465                    5,391
                                                                                               -----------              -----------

Other income and expenses:
            Non-regulated income, net                                                                  638                      550
            Gain (loss) on sale of non-utility property                                                 (2)                       1
                                                                                               -----------              -----------
            Total other income and expenses                                                            636                      551
                                                                                               -----------              -----------

Interest expense:
     Interest expense                                                                                4,646                    4,646
     Less: capitalized interest                                                                        225                      150
                                                                                               -----------              -----------
            Total interest expense                                                                   4,421                    4,496
                                                                                               -----------              -----------


Net income                                                                                     $       680              $     1,446
                                                                                               ===========              ===========

Earnings per share
     Basic                                                                                     $      0.03              $      0.08
                                                                                               ===========              ===========
     Diluted                                                                                   $      0.03              $      0.08
                                                                                               ===========              ===========
Weighted average shares outstanding
     Basic                                                                                          18,371                   16,932
                                                                                               ===========              ===========
     Diluted                                                                                        18,403                   16,953
                                                                                               ===========              ===========
Dividends per share of common stock                                                            $    0.2850              $    0.2825
                                                                                               ===========              ===========