Legal Proceedings	9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
LEGAL PROCEEDINGS	Legal Proceedings On June 14, 2018, certain shareholders of CTWS filed two nearly identical class-action complaints in Connecticut state court against the CTWS board of directors, SJW Group, Eric W. Thornburg, Chairman, President and Chief Executive Officer of SJW Group, and CTWS. The complaints, as amended on September 18, 2018 and September 20, 2018, allege that the CTWS board breached its fiduciary duties in connection with the Merger, that CTWS’s preliminary proxy statement, filed with the SEC on August 20, 2018, omits certain material information and that SJW Group and Mr. Thornburg aided and abetted the alleged breaches by the CTWS board of directors. Among other remedies, the actions seek to recover rescissory and other damages and attorney’s fees and costs. SJW Group believes the claims in these complaints are without merit and intends to vigorously defend this litigation. At this time, SJW Group cannot determine the likelihood that liability exists on the part of SJW Group or Mr. Thornburg and we are unable to provide a reasonable estimate of potential loss, if any. Additional complaints have been filed in connection with the Merger but neither SJW Group nor any of its officers or directors are named as defendants therein. On October 5, 2018, certain shareholders of CTWS filed two complaints, one individually and the other as a putative class action, in the United States District Court for the District of Connecticut against CTWS, the CTWS board of directors and the Merger. The complaints allege that the preliminary proxy statement issued in connection with the Merger omitted material information in violation of Section 14(a) and 20(a) of the Securities Exchange Act of 1934. Among other remedies, the actions seek an order (1) enjoining the defendants from consummating or closing on the Merger; (2) rescinding the Merger or awarding rescissory damages; (3) directing the defendants to disseminate a corrective proxy statement; (4) declaring that the defendants have violated Section 14(a) and/or 20(a) of the Securities Exchange Act of 1934, as well as Rule 14a-9 promulgated thereunder; and (5) awarding attorney’s fees and costs. SJW Group believes the claims in these complaints are without merit and accordingly has not accrued any amounts. 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.

Legal Proceedings

On June 14, 2018, certain shareholders of CTWS filed two nearly identical class-action complaints in Connecticut state court against the CTWS board of directors, SJW Group, Eric W. Thornburg, Chairman, President and Chief Executive Officer of SJW Group, and CTWS. The complaints, as amended on September 18, 2018 and September 20, 2018, allege that the CTWS board breached its fiduciary duties in connection with the Merger, that CTWS’s preliminary proxy statement, filed with the SEC on August 20, 2018, omits certain material information and that SJW Group and Mr. Thornburg aided and abetted the alleged breaches by the CTWS board of directors. Among other remedies, the actions seek to recover rescissory and other damages and attorney’s fees and costs. SJW Group believes the claims in these complaints are without merit and intends to vigorously defend this litigation. At this time, SJW Group cannot determine the likelihood that liability exists on the part of SJW Group or Mr. Thornburg and we are unable to provide a reasonable estimate of potential loss, if any.

Additional complaints have been filed in connection with the Merger but neither SJW Group nor any of its officers or directors are named as defendants therein. On October 5, 2018, certain shareholders of CTWS filed two complaints, one individually and the other as a putative class action, in the United States District Court for the District of Connecticut against CTWS, the CTWS board of directors and the Merger. The complaints allege that the preliminary proxy statement issued in connection with the Merger omitted material information in violation of Section 14(a) and 20(a) of the Securities Exchange Act of 1934. Among other remedies, the actions seek an order (1) enjoining the defendants from consummating or closing on the Merger; (2) rescinding the Merger or awarding rescissory damages; (3) directing the defendants to disseminate a corrective proxy statement; (4) declaring that the defendants have violated Section 14(a) and/or 20(a) of the Securities Exchange Act of 1934, as well as Rule 14a-9 promulgated thereunder; and (5) awarding attorney’s fees and costs. SJW Group believes the claims in these complaints are without merit and accordingly has not accrued any amounts.

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.