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Lines of Credit Narrative (Details) |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 11, 2020 USD ($) | Dec. 31, 2020 USD ($) | May 29, 2020 USD ($) | May 28, 2020 USD ($) | Mar. 01, 2020 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 01, 2016 USD ($)
Revolving Credit Facility | SJW Group |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Aggregate outstanding balance on lines of credit |  | $ 175,094,000 |  |  |  |  | $ 117,209,000 |
Line of Credit | Revolving Credit Facility | SJW Group |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit cost of borrowing rate |  | 1.78% |  |  |  |  | 3.73% |
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | San Jose Water Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 140,000,000 |  |  |  |  |  |  | $ 125,000,000
Increase in maximum borrowing capacity | 15,000,000 |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | SJW Corp. and SJW Land Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 15,000,000
Line of Credit | Revolving Credit Facility | CoBank | Connecticut Water Service, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 40,000,000 | $ 15,000,000 |  |  |  |
Increase in maximum borrowing capacity |  |  | $ 25,000,000 |  |  |  |  |
Line of Credit | Revolving Credit Facility | RBS Citizens, N.A. | Connecticut Water Service, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 75,000,000 | $ 95,000,000 |  |
Line of Credit | Revolving Credit Facility - Temporary | Chase Bank, N.A. | San Jose Water Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 50,000,000 |  |  |  |  |  |  |
Line of credit, term | 6 months |  |  |  |  |  |  |
Aggregate outstanding balance on lines of credit | $ 0 |  |  |  |  |  |  |
Line of Credit | Credit Agreement | Standby Letters of Credit | Chase Bank, N.A. | San Jose Water Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 10,000,000
Line of Credit | SJW Corp Credit Agreement | Standby Letters of Credit | Chase Bank, N.A. | SJW Corp. and SJW Land Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 5,000,000
Line of Credit | SJWTX Credit Agreement | Revolving Credit Facility | Chase Bank, N.A. | SJW Corp. and SJWTX, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 5,000,000
Line of Credit | SJWTX Credit Agreement | Standby Letters of Credit | Chase Bank, N.A. | SJW Corp. and SJWTX, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 1,000,000
Bank term loans | Connecticut Water Service, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Ratio of indebtedness to total capital |  | 0.65 |  |  |  |  |  |
Bank term loans | Connecticut Water Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest coverage ratio |  | 3 |  |  |  |  |  |
Ratio of indebtedness to total capital |  | 0.60 |  |  |  |  |  |
Bank term loans | Maine Water Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Ratio of indebtedness to total capital |  | 0.60 |  |  |  |  |  |
Bank term loans | Unsecured Debt | San Jose Water Company |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt covenant interest charge maximum to net Income available to stockholders |  | 1.75 |  |  |  |  |  |
Ratio of indebtedness to total capital |  | 0.666 |  |  |  |  |  |
Bank term loans | Unsecured Debt | SJW Corp. and SJWTX, Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt covenant interest charge maximum to net Income available to stockholders |  | 1.75 |  |  |  |  |  |
Ratio of indebtedness to total capital |  | 0.666 |  |  |  |  |  |

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