CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 42,050	$ 40,377	$ 55,252	$ 110,067
Other comprehensive income (loss):
Unrecoverable pension benefit plan costs, net of tax of $0	0	0	0	(13,663)
Amortization of defined benefit pension plans, net of tax of $60, $0, $120, and $0, respectively	154	298	308	595
Other comprehensive income (loss), net of tax	154	298	308	(13,068)
Comprehensive income	42,204	40,675	55,560	96,999
Comprehensive loss attributable to noncontrolling interest	(118)	(174)	(247)	(401)
Comprehensive income attributable to California Water Service Group	$ 42,322	$ 40,849	$ 55,807	$ 97,400