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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Schedule of Property, Plant and Equipment | The major components of depreciable plant and equipment as of December 31, 2024 and 2023 are as follows:
| 2024 |  | 2023
Source of supply | $ | 228,621 |  |  | 207,537 |
Pumping plant | 301,280 |  |  | 284,308 |
Water treatment plant | 367,836 |  |  | 354,617 |
Transmission and distribution plant | 3,015,978 |  |  | 2,820,358 |
General plant | 335,599 |  |  | 301,091 |
Total depreciable plant and equipment | $ | 4,249,314 |  |  | 3,967,911 |
Depreciation is computed using the straight-line method over the estimated remaining service lives of groups of assets. The estimated service lives of depreciable plant and equipment are as follows:
| Useful Lives
Source of supply | 20 to 100 years
Pumping plant | 5 to 70 years
Water treatment plant | 5 to 62 years
Transmission and distribution plant | 10 to 100 years
General plant | 5 to 68 years
Schedule of Real Estate Investments | The major components of nonutility properties and real estate investments are as follows as of December 31:
| 2024 |  | 2023
Land | $ | 915 |  |  | 4,137 |
Wholesale water supply assets | — |  |  | 8,465 |
Buildings and improvements | 399 |  |  | 748 |
Subtotal | 1,314 |  |  | 13,350 |
Less: accumulated depreciation and amortization | 98 |  |  | 194 |
Total | $ | 1,216 |  |  | 13,156 |
The following represents the major components of the Tennessee warehouse building and land property recorded in assets held-for-sale on the Consolidated Balance Sheets as of December 31, 2023:
| 2023
Land | $ | 13,170 |
Buildings and improvements | 44,950 |
Subtotal | 58,120 |
Less: accumulated depreciation and amortization | 17,270 |
Total | $ | 40,850 |
Schedule of Estimated Refunds of Advances for Construction and Contributions in Aid of Construction | Estimated refunds for the next five years and thereafter are shown below:
| Estimated Refunds
2025 | $ | 2,997 |
2026 | 2,898 |
2027 | 2,808 |
2028 | 2,741 |
2029 | 2,645 |
Thereafter | 44,406 |
Schedule of Asset Retirement Obligations | As of December 31, 2024 and 2023, the asset retirement obligation is as follows:
| 2024 |  | 2023
Estimated future retirement costs | $ | 4,303 |  |  | 4,198 |
Discount rate | 6 | % |  | 6 | %
Retirement obligation, present value | $ | 887 |  |  | 862 |
Schedule of Disaggregation of Revenue | Detail of SJW Group’s revenue components are as follows for the years ended December 31:
| 2024 |  | 2023 |  | 2022
Revenue from contracts with customers | $ | 736,326 |  |  | 678,168 |  |  | 586,918 |
Alternative revenue programs, net | 6,181 |  |  | 3,634 |  |  | (1,312) |
Other balancing and memorandum accounts and regulatory mechanisms, net | (153) |  |  | (17,123) |  |  | 29,487 |
Rental income | 6,085 |  |  | 5,684 |  |  | 5,605 |
| $ | 748,439 |  |  | 670,363 |  |  | 620,698 |

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