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Capitalization	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
CAPITALIZATION	Capitalization SJW Corp. is authorized to issue 36,000,000 shares of common stock of $0.521 par value per share. At December 31, 2014 and 2013, 20,286,840 and 20,169,211, respectively, shares of common stock were issued and outstanding. At December 31, 2014 and 2013, 176,407 shares of preferred stock of $25 par value per share were authorized; no shares of preferred stock were issued or outstanding.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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