Exhibit 32
CERTIFICATION OF CEO AND CFO
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 period ended September 30, 2010, 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.
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| Date: November 5, 2010 |
By: |
/s/ Peter C. Nelson
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PETER C. NELSON |
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President and Chief Executive Officer
California Water Service Group |
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| Date: November 5, 2010 |
By: |
/s/ Martin A. Kropelnicki
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MARTIN A. KROPELNICKI |
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Vice President, Chief Financial Officer
and Treasurer California Water Service Group |
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