EXHIBIT 12

California Water Service Group
Computation of Ratios of Earnings to Fixed Charges
including Preferred Stock Dividends

In thousands except ratios

		Three months				Six months
		ended				ended				Year ended December 31,
		June 30, 2006				June 30, 2006				2005				2004				2003				2002				2001
Earnings (1):
Income before income tax expense			9,760				11,138				47,229				43,111				32,315				31,641				24,693
Fixed charges expensed and capitalized			5,021				9,770				18,790				18,833				19,682				18,491				17,113
Capitalized interest			-625				-850				-900				-824				-1,995				-1,473				-858
Preferred dividend requirement			-38				-76				-153				-153				-153				-153				-153
			14,118				19,982				64,967				60,967				49,849				48,507				40,795
Fixed Charges:
Interest expensed and capitalized, and amortization of capitalized expense related to indebtedness			4,970				9,667				18,600				18,664				19,512				18,314				16,888
Estimated interest component of rent expense			13				27				38				16				17				24				72
Preferred dividend requirement			38				76				153				153				153				153				153
			5,021				9,770				18,790				18,833				19,682				18,491				17,113
Ratio of earnings to fixed charges including preferred stock dividends			2.81				2.05				3.46				3.24				2.53				2.62				2.38