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):       October 27, 2004
                                                  ------------------------------



                         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
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 (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 October 27, 2004, the registrant  issued the press release  attached
to this report as Exhibit 99, which  announces the results of operations for the
third quarter of 2004.


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: October 28, 2004                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 October 27, 2004 which
                  announces the results of  operations  for the third quarter of
                  2004.