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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment
The major components of depreciable plant and equipment as of December 31, 2022 and 2021 are as follows:
20222021
Equipment$652,723 598,285 
Transmission and distribution plant2,649,476 1,802,008 
Office buildings and other structures359,086 981,615 
Total depreciable plant and equipment$3,661,285 3,381,908 
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, 2022 and 2021 are as follows:
20222021
Land$12,615 12,615 
Buildings and improvements45,418 45,017 
Total real estate investments and nonutility properties$58,033 57,632 
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, 2022:
Year ending December 31:Rental Revenue
2023$4,423 
20243,157 
20253,034 
20263,197 
20273,180 
Thereafter1,679 
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
2023$3,372 
20243,332 
20253,135 
20262,931 
20272,749 
Thereafter47,370 
Schedule of Asset Retirement Obligations
As of December 31, 2022 and 2021, the asset retirement obligation is as follows:
20222021
Estimated future retirement costs $4,426 4,511 
Discount rate6 %6 %
Retirement obligation, present value$920 925 
Schedule of Disaggregation of Revenue
The major streams of revenue for SJW Group are as follows:
 202220212020
Revenue from contracts with customers$586,918 559,568 549,270 
Alternative revenue programs, net(1,312)5,304 (493)
Other balancing and memorandum accounts, net30,179 5,138 11,856 
Other regulatory mechanisms, net(692)(1,703)(1,639)
Rental income5,605 5,379 5,532 
$620,698 573,686 564,526