Long-Term Liabilities and Bank Borrowings (Notes)	9 Months Ended
Long-Term Liabilities and Bank Borrowings (Notes)	Sep. 30, 2020
Long-Term Liabilities and Bank Borrowings [Abstract]
LONG-TERM LIABILITIES AND BANK BORROWINGS	Long-Term Liabilities and Bank Borrowings SJW Group’s contractual obligations and commitments include senior notes, bank term loans, revenue bonds, state revolving fund loans, mortgages, and other obligations. Water Utility Services have received advance deposit payments from its customers on certain construction projects and the refunds of the advance deposit payments constitute an obligation of the respective subsidiaries. Lines of Credit On April 24, 2020, SJW Group and SJW Land Company entered into a Termination and Payoff agreement with JPMorgan Chase Bank, N.A. as the lender (the “Lender”) to terminate the SJW Group and SJW Land Company $15,000 credit agreement. On May 11, 2020, the SJWC entered into a Second Amendment (the “Second Amendment”) to SJWC’s existing $125,000 credit agreement, dated as of June 1, 2016, with the Lender, as amended by the First Amendment, dated January 12, 2018, (collectively, the “Existing SJWC Credit Agreement”), with the Lender. The Second Amendment amends the existing SJWC Credit Agreement to, among other things, increase the total commitment by $15,000, from $125,000 to $140,000. Also on May 11, 2020, SJWC entered into a $50,000 credit agreement (the “New SJWC Credit Agreement”) with the Lender. Proceeds of borrowings under the New SJWC Credit Agreement may be used to refinance existing debt, for working capital, and for general corporate purposes. The New SJWC Credit Agreement has a maturity date of November 11, 2020. Borrowings under the New SJWC Credit Agreement bear interest at either the Alternate Base Rate (“ABR”) or the LIBOR (as defined in the New SJWC Credit Agreement) rate. ABR borrowings (which are borrowings bearing interest at a rate determined by reference to the ABR) will bear interest at a rate per annum equal to (i) the greatest of (a) the prime rate in effect on such day, (b) the federal funds effective rate on such day plus 0.5%, and (c) the adjusted LIBOR rate for a one-month interest period on such day plus 1% plus (ii) the Applicable Rate (as defined in the New SJWC Credit Agreement), which is determined based on a pricing grid that is dependent upon the credit rating of SJWC as determined by either S&P or Moody’s. Eurodollar borrowings under the New SJWC Credit Agreement will bear interest at a rate per annum equal to (i) the adjusted LIBOR rate for the interest period in effect plus (ii) the Applicable Rate. The New SJWC 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 New SJWC Credit Agreement also includes certain financial covenants that require SJWC to maintain a maximum funded debt to capitalization ratio and a minimum interest coverage ratio and to limit SJWC’s maximum consolidated cash balance. On May 29, 2020, CTWS entered into a Second Amendment to the CTWS’s existing $15,000 credit agreement, dated as of August 6, 2014, with CoBank, ACB (“CoBank), as amended by the First Amendment, dated October 28, 2015. The Second Amendment amends the prior agreement to, among other things, increase the total commitment by $25,000, from $15,000 to $40,000 and extend the maturity date to May 15, 2025. Long-Term Debt On March 12, 2020, Connecticut Water entered into a note purchase agreement with the purchasers listed in the agreement, pursuant to which Connecticut Water sold on the same date an aggregate principal amount of $35,000 of its 3.51% Senior Notes, due March 12, 2050. The notes are unsecured obligations of Connecticut Water. Interest is payable semi-annually in arrears on March 12th and September 12th of each year. The note purchase agreement contains customary representations and warranties. Under the note purchase agreement, Connecticut Water is required to comply with certain customary affirmative and negative covenants for as long as the notes are outstanding. The notes are also subject to customary events of default, the occurrence of which may result in all of the notes then outstanding becoming immediately due and payable. The notes have terms and conditions that restrict Connecticut Water from issuing additional debt or paying a dividend to CTWS if such debt or distribution would trigger an event of default. The note purchase agreement also requires Connecticut Water to maintain a debt to capitalization ratio of not more than 60% and an interest coverage ratio at each fiscal quarter end of no less than three-to-one. As of September 30, 2020, Connecticut Water was in compliance with all financial ratio and operational covenants under this note purchase agreement. On December 19, 2019, Maine Water issued $5,000 of Series S First Mortgage Bonds to the Maine Municipal Bond Bank through the State Safe Drinking Water Revolving Loan Fund. The Series S bonds mature on October 1, 2039, and carry 1% interest. The Series S First Mortgage Bond covenants are the same as all other First Mortgage Bonds. The proceeds were held as restricted cash by a trustee to be used for pre-approved projects primarily related to preliminary engineering and design work of a new water treatment plant in Maine Water’s Biddeford and Saco division. Proceeds were held by a trustee for the bond until conditions were met. On February 3, 2020, and March 11, 2020, the trustee released proceeds of $4,114 and $886, respectively, from the bond. The associated bond indentures and loan agreements contain customary affirmative and negative covenants, including a prohibition on the issuance of indebtedness secured by assets or revenue of Maine Water where the lien is senior to the lien of the bond trustee under the above bonds except as permitted by the bond indentures and related loan and security agreements, a requirement to maintain a debt to capitalization ratio of not more than 65%, required compliance with various financial and operational covenants, and a provision for maturity acceleration upon the occurrence of stated events of default. On August 11, 2020, SJW Group entered into a note purchase agreement with the purchasers listed in the agreement, pursuant to which SJW Group sold an aggregate principal amount of $50,000 of its 2.47% Senior Notes, Series 2020, due August 1, 2030. The notes are unsecured obligations of the Company. Interest is payable semi-annually in arrears on February 1st and August 1st of each year. The note purchase agreement contains customary representations and warranties. Under the note purchase agreement, SJW Group is required to comply with certain customary affirmative and negative covenants for as long as the notes are outstanding. The notes are also subject to customary events of default, the occurrence of which may result in all of the notes then outstanding becoming immediately due and payable.