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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
REVENUE	$ 113,997	$ 124,853	$ 294,644	$ 298,981
Production Expenses:
Purchased water	35,583	33,545	75,626	72,673
Power	2,294	1,882	4,947	4,774
Groundwater extraction charges	13,182	14,890	29,145	34,341
Other production expenses	5,295	4,836	15,553	13,674
Total production expenses	56,354	55,153	125,271	125,462
Administrative and general	14,712	12,752	40,411	36,278
Maintenance	4,923	4,980	13,977	14,036
Property taxes and other non-income taxes	4,065	4,016	12,041	11,332
Depreciation and amortization	15,122	13,682	45,368	40,921
Merger related expenses	1,737	8,442	6,113	14,994
Total operating expense	96,913	99,025	243,181	243,023
OPERATING INCOME	17,084	25,828	51,463	55,958
OTHER (EXPENSE) INCOME:
Interest on long-term debt and other interest expense	(6,588)	(6,077)	(19,093)	(18,213)
Pension non-service cost	(921)	(589)	(2,749)	(1,767)
Unrealized loss on California Water Service Group stock	0	0	0	(527)
Interest income on money market fund	2,165	0	6,339	0
Gain on sale of California Water Service Group stock	0	191	0	104
Gain on sale of real estate investments	0	0	745	0
Other, net	303	538	1,210	1,980
Income before income taxes	12,043	19,891	37,915	37,535
Provision for income taxes	2,565	4,103	8,802	7,591
NET INCOME BEFORE NONCONTROLLING INTEREST	9,478	15,788	29,113	29,944
Less net income attributable to the noncontrolling interest	0	0	224	0
SJW GROUP NET INCOME	9,478	15,788	28,889	29,944
SJW GROUP COMPREHENSIVE INCOME	$ 9,478	$ 15,788	$ 28,889	$ 29,944
SJW GROUP EARNINGS PER SHARE
Basic (usd per share)	$ 0.33	$ 0.77	$ 1.02	$ 1.45
Diluted (usd per share)	0.33	0.76	1.01	1.45
DIVIDENDS PER SHARE	$ 0.30	$ 0.28	$ 0.90	$ 0.84
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (shares)	28,451,811	20,626,654	28,438,521	20,593,570
Diluted (shares)	28,549,928	20,732,040	28,528,002	20,721,970

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