Lines of Credit	12 Months Ended
Dec. 31, 2016
Line of Credit Facility [Abstract]
LINES OF CREDIT	Lines of Credit On June 1, 2016, San Jose Water Company entered into a $125,000 credit agreement (the “Credit Agreement”) with JPMorgan Chase Bank, N.A., as the lender (the “Lender”). The Credit Agreement provides an unsecured credit facility with a letter of credit sublimit of $10,000. Proceeds of borrowings under the Credit Agreement may be used to refinance existing debt, for working capital, and for general corporate purposes. The Credit Agreement has a maturity date of June 1, 2021. The Credit Agreement contains customary representations, warranties and events of default, as well as certain restrictive covenants customary for facilities of this type, including restrictions on indebtedness, liens, acquisitions and investments, restricted payments, asset sales, and fundamental changes. The Credit Agreement also includes certain financial covenants that require the Company to maintain a maximum funded debt to capitalization ratio and a minimum interest coverage ratio. On June 1, 2016, the company entered into a fourth amendment to San Jose Water Company’s existing $85,000 credit agreement, dated as of March 1, 2012, as amended from time to time (the “WF Credit Agreement”) with Wells Fargo Bank, National Association (“Wells Fargo”) thereby reducing the maximum principal amount available under such line of credit to $3,060. Pursuant to such amendment, no further borrowing was permitted under the WF Credit Agreement and the WF Credit Agreement remained outstanding for the sole purpose of reimbursing Wells Fargo for any draws against outstanding letters of credit for the California Department of Water Resources’ Safe Drinking Water State Revolving Fund (“SDWSRF”) loans and related fees until such letters of credit were replaced or terminated. Under both the Credit Agreement and the WF Credit Agreement total borrowings could not exceed $125,000. On June 29, 2016, San Jose Water Company paid off the SDWSRF loans’ remaining balance of $1,823, which had a maturity date in 2027, and the WF Credit Agreement and letters of credit were terminated on September 27, 2016. On June 1, 2016, SJW Corp. and SJW Land Company (collectively, the “Borrowers”), entered into a $15,000 credit agreement with the Lender (the “SJW Corp. Credit Agreement”), which provides an unsecured credit facility to the Borrowers with a letter of credit sublimit of $5,000. The SJW Corp. Credit Agreement matures on June 1, 2021. Borrowings under the SJW Corp. Credit Agreement bear interest under the same terms and conditions as those in the Credit Agreement. The SJW Corp. Credit Agreement replaced the then outstanding $15,000 credit agreement, dated March 1, 2012, as amended from time to time, between the Borrowers and Wells Fargo, which was paid off and terminated. In addition, on June 1, 2016, SJW Corp., as guarantor, and SJWTX, Inc. (the “Borrower”), entered into a $5,000 credit agreement with the Lender (the “SJWTX Credit Agreement”), which provides an unsecured credit facility to the Borrower with a letter of credit sublimit of $1,000. The SJWTX Credit Agreement matures on June 1, 2021. As of December 31, 2015, SJW Group and its subsidiaries had unsecured bank lines of credit with Wells Fargo, allowing aggregate short-term borrowings of up to $100,000, of which $15,000 was available to SJW Group and SJW Land Company under one line of credit and $85,000 was available to San Jose Water Company under another line of credit. San Jose Water Company issued two standby letters of credit with a commercial bank in the amount of $3,000 in support of its SDWSRF loans which were funded in 2005 and 2008. As of December 31, 2015, $3,000 under the San Jose Water Company line of credit was set aside in the form of letters of credit for its SDWSRF loans. As of December 31, 2016 and 2015, SJW Group had outstanding balances on the lines of credit of $14,200 and $34,600, respectively. Cost of borrowing on the lines of credit averaged 1.48% and 1.31% as of December 31, 2016 and 2015, respectively. The SJW Corp. and SJWTX, Inc. unsecured bank lines of credit have the following affirmative covenants calculated with the financial statements of SJW Group, on a consolidated basis: (1) the funded debt cannot exceed 66-2/3% of total capitalization, and (2) net income available for interest charges for the trailing 12-calendar-month period cannot be less than 175% of interest charges. As of December 31, 2016, SJW Group and SJWTX, Inc. were in compliance with all covenants. San Jose Water Company’s unsecured bank lines of credit have the following affirmative covenants: (1) the funded debt cannot exceed 66-2/3% of total capitalization, and (2) net income available for interest charges for the trailing 12-calendar-month period cannot be less than 175% of interest charges. As of December 31, 2016, San Jose Water Company was in compliance with all covenants.

Lines of Credit

On June 1, 2016, San Jose Water Company entered into a $125,000 credit agreement (the “Credit Agreement”) with JPMorgan Chase Bank, N.A., as the lender (the “Lender”). The Credit Agreement provides an unsecured credit facility with a letter of credit sublimit of $10,000. Proceeds of borrowings under the Credit Agreement may be used to refinance existing debt, for working capital, and for general corporate purposes. The Credit Agreement has a maturity date of June 1, 2021.

The Credit Agreement contains customary representations, warranties and events of default, as well as certain restrictive covenants customary for facilities of this type, including restrictions on indebtedness, liens, acquisitions and investments, restricted payments, asset sales, and fundamental changes. The Credit Agreement also includes certain financial covenants that require the Company to maintain a maximum funded debt to capitalization ratio and a minimum interest coverage ratio.

On June 1, 2016, the company entered into a fourth amendment to San Jose Water Company’s existing $85,000 credit agreement, dated as of March 1, 2012, as amended from time to time (the “WF Credit Agreement”) with Wells Fargo Bank, National Association (“Wells Fargo”) thereby reducing the maximum principal amount available under such line of credit to $3,060. Pursuant to such amendment, no further borrowing was permitted under the WF Credit Agreement and the WF Credit Agreement remained outstanding for the sole purpose of reimbursing Wells Fargo for any draws against outstanding letters of credit for the California Department of Water Resources’ Safe Drinking Water State Revolving Fund (“SDWSRF”) loans and related fees until such letters of credit were replaced or terminated. Under both the Credit Agreement and the WF Credit Agreement total borrowings could not exceed $125,000. On June 29, 2016, San Jose Water Company paid off the SDWSRF loans’ remaining balance of $1,823, which had a maturity date in 2027, and the WF Credit Agreement and letters of credit were terminated on September 27, 2016.

On June 1, 2016, SJW Corp. and SJW Land Company (collectively, the “Borrowers”), entered into a $15,000 credit agreement with the Lender (the “SJW Corp. Credit Agreement”), which provides an unsecured credit facility to the Borrowers with a letter of credit sublimit of $5,000. The SJW Corp. Credit Agreement matures on June 1, 2021. Borrowings under the SJW Corp. Credit Agreement bear interest under the same terms and conditions as those in the Credit Agreement. The SJW Corp. Credit Agreement replaced the then outstanding $15,000 credit agreement, dated March 1, 2012, as amended from time to time, between the Borrowers and Wells Fargo, which was paid off and terminated.

In addition, on June 1, 2016, SJW Corp., as guarantor, and SJWTX, Inc. (the “Borrower”), entered into a $5,000 credit agreement with the Lender (the “SJWTX Credit Agreement”), which provides an unsecured credit facility to the Borrower with a letter of credit sublimit of $1,000. The SJWTX Credit Agreement matures on June 1, 2021.

As of December 31, 2015, SJW Group and its subsidiaries had unsecured bank lines of credit with Wells Fargo, allowing aggregate short-term borrowings of up to $100,000, of which $15,000 was available to SJW Group and SJW Land Company under one line of credit and $85,000 was available to San Jose Water Company under another line of credit. San Jose Water Company issued two standby letters of credit with a commercial bank in the amount of $3,000 in support of its SDWSRF loans which were funded in 2005 and 2008. As of December 31, 2015, $3,000 under the San Jose Water Company line of credit was set aside in the form of letters of credit for its SDWSRF loans.

As of December 31, 2016 and 2015, SJW Group had outstanding balances on the lines of credit of $14,200 and $34,600, respectively.

Cost of borrowing on the lines of credit averaged 1.48% and 1.31% as of December 31, 2016 and 2015, respectively.

The SJW Corp. and SJWTX, Inc. unsecured bank lines of credit have the following affirmative covenants calculated with the financial statements of SJW Group, on a consolidated basis: (1) the funded debt cannot exceed 66-2/3% of total capitalization, and (2) net income available for interest charges for the trailing 12-calendar-month period cannot be less than 175% of interest charges. As of December 31, 2016, SJW Group and SJWTX, Inc. were in compliance with all covenants. San Jose Water Company’s unsecured bank lines of credit have the following affirmative covenants: (1) the funded debt cannot exceed 66-2/3% of total capitalization, and (2) net income available for interest charges for the trailing 12-calendar-month period cannot be less than 175% of interest charges. As of December 31, 2016, San Jose Water Company was in compliance with all covenants.