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                                  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): March 28, 2006

                         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))

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Item 2.02 Results of Operations and Financial Condition.
(Amounts in thousands)

On March 28,  2006,  the  Company  received  an amended  report from its actuary
regarding  the  future  benefit  payments  expected  to be paid  related  to the
Company's  pension  plan(s)  in each of the next  five  fiscal  years and in the
aggregate for the five fiscal years thereafter.

The  following  corrects  and  replaces  two  sentences  contained  in the third
paragraph of Note 12 "Employee  Benefit Plans" in the Notes to the  Consolidated
Financial  Statements  attached as part of Exhibit 13.1 to the Company's  Annual
Report on Form 10-K for the year ended December 31, 2005:

     Delete:

     Excluding costs to annuitize future retirement benefits,  benefits expected
     to be paid in each  year  from  2006 to 2010 are  $2,610,  $3,266,  $4,412,
     $5,617 and $5,683, respectively.  The aggregate benefit expected to be paid
     in the five years 2011 through 2015 is $39,142.

     Replaced by:

     If  monthly  benefits  are paid to  future  retirees,  rather  than  with a
     purchase of an annuity, payments expected to be made in each year from 2006
     to 2010 are $920,  $1,210,  $1,673,  $2,239 and $2,870,  respectively.  The
     aggregate  benefits expected to be paid in the five years 2011 through 2015
     is $26,729.  If annuities are purchased for the retirees rather than making
     monthly  payments,   the  payments  for  the  same  time  period  would  be
     approximately $2,819, $3,947, $5,448, $6,922 and $7,425, respectively.  The
     aggregate  benefit expected to be paid for annuities in the five years 2011
     through 2015 would be approximately $51,006.


The impact of the above change did not affect the Balance Sheets,  Statements of
Income  or  Statements  of Cash  Flows  or  other  disclosures  in the  Notes to
Consolidated Financial Statements.



                                    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:   March 29, 2006


                                  CALIFORNIA WATER SERVICE GROUP


                                  By:  /s/  Martin Kropelnicki
                                     ----------------------------
                                       Martin Kropelnicki
                                       Vice President, Chief Financial Officer
                                       and Treasurer
                                       (Duly Authorized Officer)