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, 2005

                         California Water Service Group
             (Exact name of registrant as specified in its charter)

         Delaware                      1-13883                  77-0448994
         --------                      -------                  ----------
(State or other jurisdiction    (Commission File No.)          (IRS Employer
      of incorporation)                                   Identification Number)


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

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

                                       N/A
          (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 5.02 Departure of Directors or Principal  Officers;  Election of Directors;
Appointment of Principal Officers.

     Richard D. Nye,  former Chief Financial  Officer of the Company,  submitted
his  resignation  from the Company  effective  October 27, 2005.  As  previously
reported,  Mr. Nye had been placed on administrative leave on September 28, 2005
following the filing of a civil suit by the Securities  and Exchange  Commission
against Mr. Nye relating to a position  that Mr. Nye held  previously at another
company.  The  Company  and Mr.  Nye  are  currently  finalizing  the  terms  of
separation arrangements which will be disclosed once they are completed.







                                    SIGNATURE

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, hereunto duly authorized.


Dated:   October 31, 2005


                                                  CALIFORNIA WATER SERVICE GROUP


                                                  By:   /s/ John S. Tootle
                                                     ---------------------------
                                                             John S. Tootle
                                                         Acting Vice President,
                                                        Chief Financial Officer
                                                             and Treasurer
                                                       (Duly Authorized Officer)