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Segment and Non-Tariffed Businesses Reporting (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
subsidiary
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting [Abstract]      
Number of subsidiaries | subsidiary 5    
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Operating revenue $ 620,698 $ 573,686 $ 564,526
Operating expense 489,720 462,527 446,856
Operating income (loss) 130,978 111,159 117,670
Net income (loss) 73,828 60,478 61,515
Depreciation and amortization 104,417 94,400 89,279
Senior note and other interest expense 58,062 54,339 54,255
Income tax expense (benefit) in net income 8,496 8,369 8,380
Assets 3,632,624 3,492,395 3,311,465
Regulated | Water Utility Services      
Segment Reporting Information [Line Items]      
Operating revenue 603,000 558,154 548,013
Operating expense 473,141 449,401 431,375
Operating income (loss) 129,859 108,753 116,638
Net income (loss) 86,500 67,530 69,245
Depreciation and amortization 99,412 91,896 86,758
Senior note and other interest expense 37,958 34,308 33,877
Income tax expense (benefit) in net income 12,756 10,327 16,563
Assets 3,524,328 3,380,637 3,197,626
Regulated | SJW Corp.      
Segment Reporting Information [Line Items]      
Operating revenue 603,000 558,154 548,013
Operating expense 473,141 449,401 431,375
Operating income (loss) 129,859 108,753 116,638
Net income (loss) 86,500 67,530 69,245
Depreciation and amortization 99,412 91,896 86,758
Senior note and other interest expense 37,958 34,308 33,877
Income tax expense (benefit) in net income 12,756 10,327 16,563
Assets 3,524,328 3,380,637 3,197,626
Non- tariffed | Water Utility Services      
Segment Reporting Information [Line Items]      
Operating revenue 12,093 10,153 10,981
Operating expense 9,538 7,138 6,943
Operating income (loss) 2,555 3,015 4,038
Net income (loss) 1,060 3,309 4,099
Depreciation and amortization 2,906 443 442
Senior note and other interest expense 0 0 0
Income tax expense (benefit) in net income 708 369 998
Assets 4,832 6,916 8,869
Non- tariffed | Real Estate Services      
Segment Reporting Information [Line Items]      
Operating revenue 5,605 5,379 5,532
Operating expense 3,719 3,585 3,510
Operating income (loss) 1,886 1,794 2,022
Net income (loss) 1,442 1,950 1,455
Depreciation and amortization 1,206 1,168 1,186
Senior note and other interest expense 0 0 0
Income tax expense (benefit) in net income 453 619 467
Assets 42,801 43,383 44,405
Non- tariffed | All Other      
Segment Reporting Information [Line Items]      
Operating revenue 0 0 0
Operating expense 3,322 2,403 5,028
Operating income (loss) (3,322) (2,403) (5,028)
Net income (loss) (15,174) (12,311) (13,284)
Depreciation and amortization 893 893 893
Senior note and other interest expense 20,104 20,031 20,378
Income tax expense (benefit) in net income (5,421) (2,946) (9,648)
Assets 60,663 61,459 60,565
Non- tariffed | SJW Corp.      
Segment Reporting Information [Line Items]      
Operating revenue 17,698 15,532 16,513
Operating expense 16,579 13,126 15,481
Operating income (loss) 1,119 2,406 1,032
Net income (loss) (12,672) (7,052) (7,730)
Depreciation and amortization 5,005 2,504 2,521
Senior note and other interest expense 20,104 20,031 20,378
Income tax expense (benefit) in net income (4,260) (1,958) (8,183)
Assets $ 108,296 $ 111,758 $ 113,839