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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Property, Plant and Equipment | The major components of depreciable plant and equipment as of December 31, 2021 and 2020 are as follows:
| 2021 |  | 2020
Equipment | $ | 598,285 |  |  | 567,904 |
Transmission and distribution | 1,802,008 |  |  | 1,699,953 |
Office buildings and other structures | 981,615 |  |  | 930,203 |
Total depreciable plant and equipment | $ | 3,381,908 |  |  | 3,198,060 |
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
Equipment | 5 to 35 years
Transmission and distribution plant | 35 to 75 years
Office buildings and other structures | 7 to 50 years
Schedule of Real Estate Investments | The major components of real estate investments and nonutility properties as of December 31, 2021 and 2020 are as follows:
| 2021 |  | 2020
Land | $ | 12,615 |  |  | 14,168 |
Buildings and improvements | 45,017 |  |  | 43,961 |
Total real estate investments and nonutility properties | $ | 57,632 |  |  | 58,129 |
Schedule of Future Minimum Rental Payments to be Received | The following schedule shows the future minimum rental payments to be received from third parties under operating leases that have remaining noncancelable lease terms in excess of one year as of December 31, 2021:
Year ending December 31: | Rental Revenue
2022 | $ | 4,251 |
2023 | 4,230 |
2024 | 2,990 |
2025 | 2,912 |
2026 | 3,075 |
Thereafter | 4,753 |
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
2022 | $ | 3,609 |
2023 | 3,548 |
2024 | 3,282 |
2025 | 3,030 |
2026 | 2,809 |
Thereafter | 49,582 |
Schedule of Asset Retirement Obligations | As of December 31, 2021 and 2020, the asset retirement obligation is as follows:
| 2021 |  | 2020
Retirement obligation | $ | 4,511 |  |  | 4,619 |
Discount rate | 6 | % |  | 6 | %
Retirement obligation, present value | $ | 925 |  |  | 939 |
Disaggregation of Revenue | The major streams of revenue for SJW Group are as follows:
| 2021 |  | 2020 |  | 2019
Revenue from contracts with customers | $ | 559,568 |  |  | 549,270 |  |  | 447,720 |
Alternative revenue programs, net | 5,304 |  |  | (493) |  |  | (18,232) |
Other balancing and memorandum accounts, net | 5,138 |  |  | 11,856 |  |  | (30,092) |
Other regulatory mechanisms, net | (1,703) |  |  | (1,639) |  |  | 15,689 |
Rental income | 5,379 |  |  | 5,532 |  |  | 5,397 |
| $ | 573,686 |  |  | 564,526 |  |  | 420,482 |

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