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 23, 2003



                         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


                                  Page 1 of 9


Item 12. Disclosure of Results of Operations and Financial Condition

     On April 23, 2003, the registrant issued the press release attached to this
report as Exhibit 99,  which  announces  the results of its  operations  for the
quarter ended March 31, 2003.


                                  Page 2 of 9


                                   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:  April 23, 2003               By: /s/ Richard D. Nye
                                        Richard D. Nye
                                        Vice President, Chief Financial Officer
                                        and Treasurer