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 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


Item 12. Disclosure of Results of Operations and Financial Condition

     On July 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 June 30, 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: July 23, 2003    By: /s/ Richard D. Nye
                           Richard D. Nye
                           Vice President, Chief Financial Officer and Treasurer