Regulatory Rate Filings	9 Months Ended
Sep. 30, 2017
Regulated Operations [Abstract]
Regulatory Rate Filings	Regulatory Rate Filings On January 6, 2017, San Jose Water Company filed Advice Letter No. 501 with the CPUC requesting authorization to implement a sales reconciliation mechanism to better conform to water forecasts authorized in the last general rate case to recorded consumption for the period of October 2015 through September 2016. The CPUC has ordered all Class A and B water utilities that have a five percent or greater divergence between authorized and actual sales during declared drought years to consider requesting a sales reconciliation mechanism to better conform to sale forecasts authorized in the last general rate case to recorded consumption. On May 3, 2017, the CPUC rejected the filing citing the end of a drought and the improved California water supply conditions. On May 10, 2017, San Jose Water Company formally requested the CPUC’s review of the rejection. The request for review is still pending before the CPUC. As required by the CPUC, on April 3, 2017 San Jose Water Company filed an application requesting authority to increase its authorized Cost of Capital for the period from January 1, 2018 through December 31, 2020. If approved by the CPUC, San Jose Water Company’s annual revenues would increase by approximately $7,550 or about 2.1% in 2018. This request is still pending before the CPUC. On June 6, 2017, San Jose Water Company filed Advice Letter No. 510 with the CPUC requesting authorization to issue a surcredit totaling $1,794 to refund service charge rate changes as a result of a change in billing practice effective January 1, 2017. The refund period covers prorated service charge rate changes that occurred from January 1, 2014, through December 31, 2016. On August 11, 2017, the CPUC rejected Advice Letter No. 510 citing the formal complaint filed by some customers and served to San Jose Water Company by the CPUC over the same issue. A pre-hearing conference was held on the formal complaint on September 12, 2017, where the parties agreed to suspend the proceeding. On September 29, 2017, San Jose Water Company filed Advice Letter No. 512 with the CPUC requesting authorization to re-implement a surcharge to recover the under-collected balance of $11,474 remaining from the 2012 General Rate Case true-up due to the delayed 2012 General Rate Case Application decision. Actual sales were substantially lower than the CPUC authorized sales estimate used to calculate the surcharge amount over the three-year recovery period. San Jose water Company is seeking to recover the remaining under-collected balance. This request is still pending before the CPUC.

Regulatory Rate Filings

On January 6, 2017, San Jose Water Company filed Advice Letter No. 501 with the CPUC requesting authorization to implement a sales reconciliation mechanism to better conform to water forecasts authorized in the last general rate case to recorded consumption for the period of October 2015 through September 2016. The CPUC has ordered all Class A and B water utilities that have a five percent or greater divergence between authorized and actual sales during declared drought years to consider requesting a sales reconciliation mechanism to better conform to sale forecasts authorized in the last general rate case to recorded consumption. On May 3, 2017, the CPUC rejected the filing citing the end of a drought and the improved California water supply conditions. On May 10, 2017, San Jose Water Company formally requested the CPUC’s review of the rejection. The request for review is still pending before the CPUC.

As required by the CPUC, on April 3, 2017 San Jose Water Company filed an application requesting authority to increase its authorized Cost of Capital for the period from January 1, 2018 through December 31, 2020. If approved by the CPUC, San Jose Water Company’s annual revenues would increase by approximately $7,550 or about 2.1% in 2018. This request is still pending before the CPUC.

On June 6, 2017, San Jose Water Company filed Advice Letter No. 510 with the CPUC requesting authorization to issue a surcredit totaling $1,794 to refund service charge rate changes as a result of a change in billing practice effective January 1, 2017. The refund period covers prorated service charge rate changes that occurred from January 1, 2014, through December 31, 2016. On August 11, 2017, the CPUC rejected Advice Letter No. 510 citing the formal complaint filed by some customers and served to San Jose Water Company by the CPUC over the same issue. A pre-hearing conference was held on the formal complaint on September 12, 2017, where the parties agreed to suspend the proceeding.

On September 29, 2017, San Jose Water Company filed Advice Letter No. 512 with the CPUC requesting authorization to re-implement a surcharge to recover the under-collected balance of $11,474 remaining from the 2012 General Rate Case true-up due to the delayed 2012 General Rate Case Application decision. Actual sales were substantially lower than the CPUC authorized sales estimate used to calculate the surcharge amount over the three-year recovery period. San Jose water Company is seeking to recover the remaining under-collected balance. This request is still pending before the CPUC.