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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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:
20242023
Source of supply
$228,621 207,537 
Pumping plant
301,280 284,308 
Water treatment plant
367,836 354,617 
Transmission and distribution plant3,015,978 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:
20242023
Land$915 4,137 
Wholesale water supply assets
— 8,465 
Buildings and improvements399 748 
Subtotal1,314 13,350 
Less: accumulated depreciation and amortization98 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 improvements44,950 
Subtotal58,120 
Less: accumulated depreciation and amortization17,270 
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 
20262,898 
20272,808 
20282,741 
20292,645 
Thereafter44,406 
Schedule of Asset Retirement Obligations
As of December 31, 2024 and 2023, the asset retirement obligation is as follows:
20242023
Estimated future retirement costs $4,303 4,198 
Discount rate6 %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:
 202420232022
Revenue from contracts with customers$736,326 678,168 586,918 
Alternative revenue programs, net6,181 3,634 (1,312)
Other balancing and memorandum accounts and regulatory mechanisms, net
(153)(17,123)29,487 
Rental income6,085 5,684 5,605 
$748,439 670,363 620,698