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Contingencies	12 Months Ended
Contingencies	Dec. 31, 2012
Legal Proceedings [Abstract]
Contingencies	Contingencies SJW Corp. is subject to ordinary routine litigation incidental to its business. There are no pending legal proceedings to which SJW Corp. or any of its subsidiaries is a party, or to which any of its properties is the subject, that are expected to have a material effect on SJW Corp.’s business, financial position, results of operations or cash flows.