Exhibit 12.1

California Water Service Group
Computation of Ratios of Earnings to Fixed Charges
(In thousands except ratios)

 
  Year ended December 31,  
 
  2012   2011   2010   2009   2008  

Earnings:

                               

Income before Income Tax Expense

  $ 70,279   $ 60,878   $ 62,211   $ 67,916   $ 63,936  

Fixed Charges Interest Expense

    32,354     32,455     27,936     24,394     20,591  

Capitalized Interest

    (3,401 )   (2,741 )   (1,563 )   (3,081 )   (3,411 )
                       

Total

  $ 99,232   $ 90,592   $ 88,584   $ 89,229   $ 81,116  
                       

Fixed Charges:

                               

Interest Expensed & Capitalized, & amortization of capitalized expense related to indebtedness

  $ 32,072   $ 32,455   $ 27,936   $ 24,394   $ 20,591  

Estimated Interest Component of Rent Expense

    282     474     338     329     237  
                       

Total

  $ 32,354   $ 32,929   $ 28,274   $ 24,723   $ 20,828  
                       

Ratio of Earnings to Fixed Charges

    3.07     2.75     3.13     3.61     3.89