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Long-Term Debt - Narrative (Details) - USD ($)	Dec. 01, 2021	May 13, 2021	Dec. 31, 2021	Aug. 04, 2021	Jun. 25, 2021	Mar. 02, 2021	Dec. 31, 2020	Dec. 23, 2020	Aug. 11, 2020	Mar. 12, 2020
Debt Instrument [Line Items]
Long-term debt			$ 1,522,955,000				$ 1,352,320,000
SJW Group | Senior notes
Debt Instrument [Line Items]
Long-term debt			$ 560,000,000				610,000,000
SJW Group | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates			3.53%
SJW Group | Senior notes | 2.47% Senior Notes, Series 2020
Debt Instrument [Line Items]
Aggregate principal amount									$ 50,000,000
Stated interest rates									2.47%
SJWC | Senior notes
Debt Instrument [Line Items]
Long-term debt			$ 420,000,000				320,000,000
SJWC | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates			8.58%
SJWC | Senior notes | 3.00% Senior Notes, Series N
Debt Instrument [Line Items]
Aggregate principal amount					$ 50,000,000
Stated interest rates					3.00%
SJWC | Senior notes | 3.00% Senior Notes, Series O
Debt Instrument [Line Items]
Aggregate principal amount				$ 50,000,000
Stated interest rates				3.00%
Connecticut Water
Debt Instrument [Line Items]
Long-term debt			$ 303,140,000				225,400,000
Connecticut Water | Senior notes
Debt Instrument [Line Items]
Long-term debt			$ 170,000,000				70,000,000
Connecticut Water | Senior notes | Maximum
Debt Instrument [Line Items]
Stated interest rates			3.53%
Connecticut Water | Senior notes | 3.07% Senior Notes, Series 2021A
Debt Instrument [Line Items]
Aggregate principal amount				$ 50,000,000
Stated interest rates				3.07%
Connecticut Water | Senior notes | 3.10% Senior Notes, Series 2021B
Debt Instrument [Line Items]
Aggregate principal amount	$ 50,000,000
Stated interest rates	3.10%
Connecticut Water | Senior notes | 3.51% Senior Notes, Due March 2050
Debt Instrument [Line Items]
Aggregate principal amount										$ 35,000,000
Stated interest rates										3.51%
Connecticut Water | Bank term loans
Debt Instrument [Line Items]
Long-term debt			$ 111,090,000				111,090,000
Connecticut Water | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates			4.75%
CLWSC | Bank term loans | 4.01% Note Due March 2041
Debt Instrument [Line Items]
Stated interest rates		4.01%
Proceeds from issuance of debt		$ 20,000,000
CLWSC | Bank term loans | 4.01% Note Due March 2041 | Maximum
Debt Instrument [Line Items]
Aggregate principal amount		$ 30,000,000
CLWSC | Bank term loans | 4.11% Note Due March 2041
Debt Instrument [Line Items]
Stated interest rates	4.11%
Proceeds from issuance of debt	$ 10,000,000
Maine Water
Debt Instrument [Line Items]
Long-term debt			$ 54,464,000				39,751,000
Maine Water | Bank term loans
Debt Instrument [Line Items]
Long-term debt			$ 34,500,000				17,500,000
Maine Water | Bank term loans | Maximum
Debt Instrument [Line Items]
Stated interest rates			5.51%
Maine Water | Bank term loans | 3.89% Note Due March 2041
Debt Instrument [Line Items]
Aggregate principal amount						$ 17,000,000
Stated interest rates						3.89%
Maine Water | Public utility, bonds | State Revolving Fund Loans Series T
Debt Instrument [Line Items]
Stated interest rates								1.00%
Long-term debt								$ 4,000,000
Significant Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of long-term debt			$ 1,651,825,000				$ 1,570,727,000

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