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General (Tables)
 9 Months Ended
Sep. 30, 2021
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,
 2021202020212020
Revenue from contracts with customers$163,103 167,045 $422,545 414,344 
Alternative revenue programs, net2,216 1,324 4,984 4,877 
Other balancing and memorandum accounts, net639 1,532 3,637 11,743 
Other regulatory mechanisms, net(438)(5,441)(1,284)(6,355)
Rental income1,403 1,403 4,067 4,217 
$166,923 165,863 $433,949 428,826 
Schedule of Real Estate Investments
The major components of real estate investments as of September 30, 2021, and December 31, 2020, are as follows: 
September 30,
2021		December 31,
2020
Land$14,168 14,168 
Buildings and improvements44,597 43,961 
Subtotal58,765 58,129 
Less: accumulated depreciation and amortization15,655 14,783 
Total$43,110 43,346