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Long-Term Debt - Narrative (Details) - USD ($)							12 Months Ended
	Dec. 15, 2020	Nov. 02, 2020	Aug. 11, 2020	Mar. 12, 2020	Oct. 08, 2019	Mar. 28, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 23, 2020	Dec. 19, 2019
Debt Instrument [Line Items]
Repayments of Long-term Debt							$ 28,931,000	$ 1,400,000	$ 0
Long-term debt							1,352,320,000	1,292,586,000
Significant Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of long-term debt							1,570,727,000	1,396,205,000
SJW Group | Senior notes
Debt Instrument [Line Items]
Minimum net worth required for compliance							$ 175,000,000
Cumulative net income, percentage included in net worth for compliance							30.00%
Principal Debt Sold			$ 50,000,000
Stated interest rates			2.47%
Long-term debt							$ 610,000,000	560,000,000
SJW Group | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates							2.47%
SJW Group | Senior notes | Financial Guarantee
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.6666
SJW Group | Senior notes | 2011 Senior Notes
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.6666
SJW Group | Senior notes | 2019 and 2020 Unsecured Notes
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.70
SJW Group | Senior notes | Series 2019A
Debt Instrument [Line Items]
Principal Debt Sold					$ 310,000,000
Stated interest rates					3.05%
SJW Group | Senior notes | Series 2019B
Debt Instrument [Line Items]
Principal Debt Sold					$ 75,000,000
Stated interest rates					3.15%
SJW Group | Senior notes | Series 2019C
Debt Instrument [Line Items]
Principal Debt Sold					$ 125,000,000
Stated interest rates					3.53%
San Jose Water Company | California Pollution Control Financing Authority Revenue Bonds
Debt Instrument [Line Items]
Long-term debt							$ 440,000,000	450,000,000
San Jose Water Company | Senior notes
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.6666
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges							1.75
Restricted payment, maximum payment amount							$ 20,000,000
Long-term debt							$ 320,000,000	330,000,000
San Jose Water Company | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates							4.29%
San Jose Water Company | Senior notes | Series C
Debt Instrument [Line Items]
Repayments of Long-term Debt		$ 10,000,000
San Jose Water Company | Senior notes | Series M
Debt Instrument [Line Items]
Principal Debt Sold						$ 80,000,000
Stated interest rates						4.29%
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds
Debt Instrument [Line Items]
Long-term debt							$ 120,000,000	120,000,000
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Minimum
Debt Instrument [Line Items]
Stated interest rates							4.75%
Connecticut Water Service, Inc. | Bank term loans
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.60
Long-term debt							$ 22,169,000	23,935,000
Connecticut Water Service, Inc. | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates							4.09%
Connecticut Water Company
Debt Instrument [Line Items]
Long-term debt							$ 225,400,000	198,646,000
Connecticut Water Company | Senior notes
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.60
Principal Debt Sold				$ 35,000,000
Stated interest rates				3.51%
Long-term debt							$ 70,000,000	35,000,000
Interest coverage ratio							3
Connecticut Water Company | Senior notes | Minimum
Debt Instrument [Line Items]
Stated interest rates							3.51%
Connecticut Water Company | Bank term loans
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.60
Repayments of Long-term Debt	$ 8,000,000
Long-term debt							$ 111,090,000	119,090,000
Interest coverage ratio							3
Connecticut Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates							3.51%
Connecticut Water Company | Public utility, bonds | Water Facilities Revenue Bonds
Debt Instrument [Line Items]
Long-term debt							$ 44,310,000
SJWTX, Inc. | Senior notes
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.6666
Stated interest rates							6.27%
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges							1.75
Long-term debt							$ 15,000,000	15,000,000
SJWTX, Inc. | Senior notes | Financial Guarantee
Debt Instrument [Line Items]
Minimum net worth required for compliance							$ 125,000,000
SJWTX, Inc. | Senior notes | Financial Guarantee | Minimum
Debt Instrument [Line Items]
Cumulative net income, percentage included in net worth for compliance							30.00%
Maine Water Company
Debt Instrument [Line Items]
Long-term debt							$ 39,751,000	38,032,000
Maine Water Company | Bank term loans
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.60
Long-term debt							$ 17,500,000	17,500,000
Interest coverage ratio							3
Maine Water Company | Bank term loans | Minimum
Debt Instrument [Line Items]
Stated interest rates							4.18%
Maine Water Company | Public utility, bonds | State revolving fund loans
Debt Instrument [Line Items]
Long-term debt							$ 18,651,000	16,032,000
Maine Water Company | Public utility, bonds | State revolving fund loans | Minimum
Debt Instrument [Line Items]
Stated interest rates							0.00%
Maine Water Company | Public utility, bonds | Other First Mortgage Bonds
Debt Instrument [Line Items]
Ratio of indebtedness to total capital							0.65
Stated interest rates							8.95%
Long-term debt							$ 3,600,000	$ 4,500,000
Interest coverage ratio							3
Dividend restriction, cumulative dividends paid maximum							$ 120,000
Maine Water Company | Public utility, bonds | State Revolving Fund Loans Series T
Debt Instrument [Line Items]
Stated interest rates										1.00%
Long-term debt										$ 4,000,000
Maine Water Company | Public utility, bonds | State Revolving Fund Loans Series S
Debt Instrument [Line Items]
Stated interest rates											1.00%
Long-term debt											$ 5,000,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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