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General (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Major Streams of Revenue
The major streams of revenue for SJW Group are as follows:
 Three months ended March 31,
 20222021
Revenue from contracts with customers$121,777 112,238 
Alternative revenue programs, net(1,927)112 
Other balancing and memorandum accounts, net2,430 1,521 
Other regulatory mechanisms, net666 (430)
Rental income1,356 1,344 
$124,302 114,785 
Schedule of Real Estate Investments and Nonutility Properties
The major components of real estate investments and nonutility properties as of March 31, 2022, and December 31, 2021, are as follows: 
March 31,
2022		December 31,
2021
Land$12,615 12,615 
Buildings and improvements45,058 45,017 
Subtotal57,673 57,632 
Less: accumulated depreciation and amortization16,251 15,951 
Total$41,422 41,681