CERTIFICATION
Published on March 25, 2003
Exhibit 99
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 periodic report 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 annual report on
Form 10K fairly presents, in all material respects, the financial condition and
results of operations of California Water Service Group.
A signed original of this written statement required by Section 906 has been
provided to California Water Service Group and will be retained by California
Water Service Group and furnished to the Securities and Exchange Commission or
its staff upon request.
Date: March 24, 2003 /s/ Peter C. Nelson
PETER C. NELSON
Chief Executive Officer
California Water Service Group
Date: March 24, 2003 By: /s/ Richard D. Nye
RICHARD D. NYE
Chief Financial Officer
California Water Service Group