SJW 2012 Q4 10K Exhibit 23

We consent to the incorporation by reference in the registration statements (Nos. 333-105010 and 333-127383) on Form S-8 and in the registration statements (No. 333-172048 and 333-184984) on Form S-3 of SJW Corp. of our report dated February 28, 2013, with respect to the consolidated balance sheets of SJW Corp. and subsidiaries as of December 31, 2012 and 2011, and the related consolidated statements of comprehensive income, changes in shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2012, and the related financial statement schedule, and the effectiveness of internal control over financial reporting as of December 31, 2012, which report appears in the December 31, 2012 annual report on Form 10-K of SJW Corp.