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Long-Term Liabilities	3 Months Ended
Long-Term Liabilities	Mar. 31, 2012
Long Term Liabilities [Abstract]
Long-term Debt [Text Block]	Long-Term Liabilities SJW Corp.’s contractual obligations and commitments include senior notes, mortgages and other obligations. San Jose Water Company, a subsidiary of SJW Corp., has received advance deposit payments from its customers on certain construction projects. Refunds of the advance deposit payments constitute an obligation of San Jose Water Company solely. On March 1, 2012, SJW Corp., SJW Land Company and Wells Fargo Bank, National Association (“Wells Fargo”) entered into a credit agreement which provides for an unsecured revolving credit facility in an aggregate amount of $15,000. This credit agreement expanded and replaced SJW Corp.’s and SJW Land Company’s existing credit facility with Wells Fargo. In addition, San Jose Water Company and Wells Fargo entered into a credit agreement which provides for an unsecured revolving credit facility in an aggregate amount of $75,000. This credit agreement replaced San Jose Water Company’s existing credit facility with Wells Fargo. These lines of credit bear interest at variable rates, and will expire on September 1, 2014.