Commitments	12 Months Ended
Dec. 31, 2017
Commitments Disclosure [Abstract]
Commitments	Commitments San Jose Water Company purchases water from SCVWD under terms of a master contract expiring in 2051. Delivery schedules for purchased water are based on a contract year beginning July 1, and are negotiated every three years under terms of the master contract with SCVWD. For the years ended December 31, 2017, 2016 and 2015, San Jose Water Company purchased from SCVWD 20,172 million gallons ($76,106), 18,241 million gallons ($61,645) and 18,482 million gallons ($52,553), respectively, of contract water. In accordance with the reduction of treated water deliveries approved by the SCVWD Board of Directors on June 14, 2016, the contractual delivery schedule was reduced by 20% through January 31, 2017. On January 31, 2017, SCVWD Board of Directors approved treated water deliveries reflecting the contractual delivery schedule reduced by 10% through June 30, 2018. Based on current prices and estimated deliveries, San Jose Water Company is committed to purchase from SCVWD a minimum of 90% of the reduced delivery schedule, or 19,748 million gallons ($77,271) of water at the current contract water rate of $3.9 per million gallons in the year ending December 31, 2018. Additionally, San Jose Water Company purchases non-contract water from SCVWD on an “as needed” basis if the water supply is available. In 1997, San Jose Water Company entered into a 25-year contract agreement with the City of Cupertino to operate the City’s municipal water system. San Jose Water Company paid a one-time, upfront concession fee of $6,800 to the City of Cupertino which is amortized over the contract term. Under the terms of the contract agreement, San Jose Water Company assumed responsibility for maintenance and operating costs, while receiving all payments for water service. Water service rates are generally subject to approval by the Cupertino City Council. CLWSC has long-term contracts with the GBRA. The terms of the agreements expire in 2037, 2040, 2044 and 2050. The agreements, which are take-or-pay contracts, provide CLWSC with 6,900 acre-feet per year of water supply from Canyon Lake. The water rate may be adjusted by GBRA at any time, provided they give CLWSC a 60-day written notice on the proposed adjustment. As of December 31, 2017, San Jose Water Company had 368 employees, of whom 134 were executive, administrative or supervisory personnel, and of whom 234 were members of unions. In November 2016, San Jose Water Company reached three-year collective bargaining agreements with the Utility Workers of America, representing the majority of all employees, and the International Union of Operating Engineers, representing certain employees in the engineering department, covering the period from January 1, 2017 through December 31, 2019. The agreements include a 3.5% wage increase in 2017, 3% in 2018 and 4% in 2019 for union workers as well as increases in medical co-pays and employee cost-sharing.

Commitments

San Jose Water Company purchases water from SCVWD under terms of a master contract expiring in 2051. Delivery schedules for purchased water are based on a contract year beginning July 1, and are negotiated every three years under terms of the master contract with SCVWD. For the years ended December 31, 2017, 2016 and 2015, San Jose Water Company purchased from SCVWD 20,172 million gallons ($76,106), 18,241 million gallons ($61,645) and 18,482 million gallons ($52,553), respectively, of contract water. In accordance with the reduction of treated water deliveries approved by the SCVWD Board of Directors on June 14, 2016, the contractual delivery schedule was reduced by 20% through January 31, 2017. On January 31, 2017, SCVWD Board of Directors approved treated water deliveries reflecting the contractual delivery schedule reduced by 10% through June 30, 2018. Based on current prices and estimated deliveries, San Jose Water Company is committed to purchase from SCVWD a minimum of 90% of the reduced delivery schedule, or 19,748 million gallons ($77,271) of water at the current contract water rate of $3.9 per million gallons in the year ending December 31, 2018. Additionally, San Jose Water Company purchases non-contract water from SCVWD on an “as needed” basis if the water supply is available.

In 1997, San Jose Water Company entered into a 25-year contract agreement with the City of Cupertino to operate the City’s municipal water system. San Jose Water Company paid a one-time, upfront concession fee of $6,800 to the City of Cupertino which is amortized over the contract term. Under the terms of the contract agreement, San Jose Water Company assumed responsibility for maintenance and operating costs, while receiving all payments for water service. Water service rates are generally subject to approval by the Cupertino City Council.

CLWSC has long-term contracts with the GBRA. The terms of the agreements expire in 2037, 2040, 2044 and 2050. The agreements, which are take-or-pay contracts, provide CLWSC with 6,900 acre-feet per year of water supply from Canyon Lake. The water rate may be adjusted by GBRA at any time, provided they give CLWSC a 60-day written notice on the proposed adjustment.

As of December 31, 2017, San Jose Water Company had 368 employees, of whom 134 were executive, administrative or supervisory personnel, and of whom 234 were members of unions. In November 2016, San Jose Water Company reached three-year collective bargaining agreements with the Utility Workers of America, representing the majority of all employees, and the International Union of Operating Engineers, representing certain employees in the engineering department, covering the period from January 1, 2017 through December 31, 2019. The agreements include a 3.5% wage increase in 2017, 3% in 2018 and 4% in 2019 for union workers as well as increases in medical co-pays and employee cost-sharing.