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Regulatory Rate Filings	9 Months Ended
	Sep. 30, 2016
Regulated Operations [Abstract]
Regulatory Rate Filings	Regulatory Rate Filings Effective September 15, 2016, the Cupertino City Council authorized San Jose Water Company to implement a 8.6% general rate increase and a 2016 Interim Rate True-Up Surcharge of $0.1832 per CCF to be collected over a 12-month period from customers in the Cupertino leased water system San Jose Water Company operates. The new rates match those previously approved by the CPUC in San Jose Water Company's most recent General Rate Case Decision effective January 1, 2016.

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