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Legal Proceedings	3 Months Ended
Legal Proceedings	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
LEGAL PROCEEDINGS	Legal Proceedings SJW Group is subject to ordinary routine litigation incidental to its business. There are no pending legal proceedings to which SJW Group 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 Group’s business, financial position, results of operations or cash flows.