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General (Tables)
 9 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]  
Major Streams of Revenue The major streams of revenue for SJW Group are as follows:
 Three months ended September 30,Nine months ended September 30,
 2022202120222021
Revenue from contracts with customers$169,972 163,103 $440,406 422,545 
Alternative revenue programs, net3,172 2,216 (1,737)4,984 
Other balancing and memorandum accounts, net1,857 639 6,719 3,637 
Other regulatory mechanisms, net(494)(438)(260)(1,284)
Rental income1,474 1,403 4,196 4,067 
$175,981 166,923 $449,324 433,949 
Schedule of Real Estate Investments and Nonutility Properties
The major components of real estate investments and nonutility properties as of September 30, 2022, and December 31, 2021, are as follows: 
September 30,
2022		December 31,
2021
Land$12,615 12,615 
Buildings and improvements45,397 45,017 
Subtotal58,012 57,632 
Less: accumulated depreciation and amortization16,855 15,951 
Total$41,157 41,681