Form: 10-K

Annual report pursuant to Section 13 and 15(d)

March 1, 2011

Exhibit 12.1
California Water Service Group
Computation of Ratios of Earnings to Fixed Charges

(In thousands except ratios)
                                                 
    Year ended December 31,  
    2010     2009     2008     2007     2006     2005  
Earnings:
                                               
Income before Income Tax Expense
  $ 62,211     $ 67,916     $ 63,936     $ 51,882     $ 42,419     $ 47,229  
Fixed Charges Interest Expense
    27,936       24,394       20,591       19,719       19,669       18,600  
Capitalized Interest
    (1,563 )     (3,081 )     (3,411 )     (2,585 )     (2,700 )     (900 )
 
                                   
Total
  $ 88,584     $ 89,229     $ 81,116     $ 69,016     $ 59,388     $ 64,929  
 
                                   
Fixed Charges:
                                               
Interest Expensed &Capitalized, & amortization of capitalized expense related to indebtedness
  $ 27,936     $ 24,394     $ 20,591     $ 19,719     $ 19,669     $ 18,600  
Estimated Interest Component of Rent Expense
    338       329       237       221       208       180  
 
                                   
Total
  $ 28,274     $ 24,723     $ 20,828     $ 19,940     $ 19,877     $ 18,780  
 
                                   
Ratio of Earnings to Fixed Charges
    3.13       3.61       3.89       3.46       2.99       3.46