Exhibit 32

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant  to  Section  906  of  the  Sarbanes-Oxley  Act of  2002,  each  of the
undersigned  certifies that this  Quarterly  Report on Form 10-Q for the Quarter
Ended  September 30, 2003 fully complies with the  requirements of Section 13(a)
or 15(d),  as applicable,  of the  Securities  Exchange Act of 1934 and that the
information  contained in this Report fairly presents, in all material respects,
the financial  condition  and results of operations of California  Water Service
Group.



Date: November 13, 2003                         /s/ Peter C. Nelson
                                                --------------------------
                                                PETER C. NELSON
                                                Chief Executive Officer
                                                California Water Service Group



Date: November 13, 2003                         /s/  Richard D. Nye
                                                ---------------------------
                                                RICHARD D. NYE
                                                Chief Financial Officer
                                                California Water Service Group