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): January 28, 2004


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


             Delaware                                  77-0448994
     (State of Incorporation)            (I.R.S. Employer Identification No.)

                         Commission file number 1-13883


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

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

Former  name,  former  address and former  fiscal  year,  if changed  since last
report: Not Applicable





Item 12. Disclosure of Results of Operations and Financial Condition

         On January 28, 2004, the registrant  issued the press release  attached
to this report as Exhibit 99, which  announces the results of its operations for
the fourth quarter and full year of 2003.


                                   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 thereunto duly authorized.


                         CALIFORNIA WATER SERVICE GROUP
                                   Registrant


Date: January 28, 2004                  By: /s/ Richard D. Nye
                                            ---------------------------
                                            Richard D. Nye
                                            Vice President, Chief Financial
                                            Officer and Treasurer