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Commitments (Details) $ / billionGallon in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 12, 2024 | May 19, 2023 gal | Nov. 07, 2020 $ / ft³ gal | Nov. 06, 2020 | May 19, 2003 | Oct. 31, 2024 USD ($) serviceConnection | Mar. 31, 2023 | Dec. 31, 2024 USD ($) acre_foot employee $ / billionGallon $ / ft³ gal | Dec. 31, 2023 USD ($) gal | Dec. 31, 2022 USD ($) gal | Dec. 31, 2008 gal
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchased water | $ |  |  |  |  |  |  |  | $ 158,568 | $ 135,982 | $ 122,334 |
Number of service connections | serviceConnection |  |  |  |  |  | 4,700 |  |  |  |  |
Service agreement, term of contract |  |  |  |  |  | 12 years |  |  |  |  |
Service agreement, renewal term |  |  |  |  |  | 8 years |  |  |  |  |
Service agreement, upfront concession fee | $ |  |  |  |  |  | $ 22,100 |  |  |  |  |
Service agreement, annual rent expense | $ |  |  |  |  |  | $ 1,800 |  |  |  |  |
Union Member |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2023 |  |  |  |  |  |  | 6.00% |  |  |  |
Collective bargaining agreement percent of wage increase for 2024 |  |  |  |  |  |  | 3.50% |  |  |  |
Collective bargaining agreement percent of wage increase for 2025 |  |  |  |  |  |  | 5.50% |  |  |  |
SJW Group |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  |  | 395 |  |  |
SJW Group | Union Member |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  |  | 241 |  |  |
RWA | Capacity Agreement |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current contract water rate | $ / billionGallon |  |  |  |  |  |  |  | 3,100 |  |  |
RWA | Maximum | Capacity Agreement |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal |  |  |  |  |  |  |  |  |  |  | 1,000,000
MDC | Capacity Agreement |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current contract water rate | $ / ft³ |  |  |  |  |  |  |  | 3.80 |  |  |
Agreement to purchase water (in gallons of water) | gal |  | 280,000,000 |  |  |  |  |  |  |  |  |
Purchase commitment period |  |  |  |  | 50 years |  |  |  |  |  |
Kennebec Water District |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal |  |  | 50,000,000.00 |  |  |  |  |  |  |  |
Long-term purchase commitment, wholesale discount (in USD per hundred cubic feet) | $ / ft³ |  |  | 0.20 |  |  |  |  |  |  |  |
Contract agreement, term |  |  | 20 years | 20 years |  |  |  |  |  |  |
Tariff rate (in USD per hundred cubic feet) | $ / ft³ |  |  |  |  |  |  |  | 1.51 |  |  |
International Union of Operating Engineers | SJW Group |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bargaining agreements, term |  |  |  |  |  |  | 3 years |  |  |  |
Santa Clara Valley Water District |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Master contract, negotiated term for delivery schedules |  |  |  |  |  |  |  | 3 years |  |  |
Water purchased (in gallons) | gal |  |  |  |  |  |  |  | 17,000,000,000.0 | 18,300,000,000 | 18,200,000,000 |
Purchased water | $ |  |  |  |  |  |  |  | $ 117,698 | $ 111,173 | $ 96,793 |
Reduction in delivery schedule, percent | 23.00% |  |  |  |  |  |  |  |  |  |
Minimum percent of delivery schedule to be purchased |  |  |  |  |  |  |  | 90.00% |  |  |
Minimum volume of water to be purchased (in gallons) | gal |  |  |  |  |  |  |  | 18,900,000,000 |  |  |
Cost of water to be purchased | $ |  |  |  |  |  |  |  | $ 135,975 |  |  |
Current contract water rate | $ / billionGallon |  |  |  |  |  |  |  | 7,194 |  |  |
Guadalupe-Blanco River Authority | SJWTX, Inc. |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot |  |  |  |  |  |  |  | 7,602 |  |  |
Notice period required for contract adjustment |  |  |  |  |  |  |  | 60 days |  |  |
Lower Colorado River Authority | SJWTX, Inc. |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot |  |  |  |  |  |  |  | 350 |  |  |

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