California Water Service (CWT) 10-Q 2011 Q3 Quarterly report

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, 2011, 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 XX, 2011	By:	/s/ Peter C. Nelson
		PETER C. NELSON
		President and Chief Executive Officer
		California Water Service Group
Date: November 4, 2011	By:	/s/ Martin A. Kropelnicki
		MARTIN A. KROPELNICKI
		Vice President, Chief Financial Officer
		and Treasurer California Water Service Group