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):    July 27, 2005
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                         CALIFORNIA WATER SERVICE GROUP
                         ------------------------------
             (Exact name of registrant as specified in its charter)


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


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


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


                                 Not Applicable
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          (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 ))


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Item 2.02 Results of Operations and Financial Condition.


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



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




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                                  Exhibit Index


Exhibit No.                            Description
-----------                            -----------
99.1           Press  release  of the  registrant  dated  July  27,  2005  which
               announces  the results of  operations  for the second  quarter of
               2005.



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