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General (Tables)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Major Streams of Revenue
The major streams of revenue for SJW Group are as follows:
 Three months ended June 30,Six months ended June 30,
 2021202020212020
Revenue from contracts with customers$147,204 142,163 $259,442 247,299 
Alternative revenue programs, net2,656 3,049 2,768 3,553 
Other balancing and memorandum accounts, net1,477 1,629 2,998 10,211 
Other regulatory mechanisms, net(416)(1,076)(846)(914)
Rental income1,320 1,444 2,664 2,814 
$152,241 147,209 $267,026 262,963 
Schedule of Real Estate Investments
The major components of real estate investments as of June 30, 2021, and December 31, 2020, are as follows: 
June 30,
2021		December 31,
2020
Land$14,198 14,168 
Buildings and improvements44,191 43,961 
Subtotal58,389 58,129 
Less: accumulated depreciation and amortization15,363 14,783 
Total$43,026 43,346