General - Schedule of H2O America's Revenue Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 197,777	$ 173,106	$ 362,640	$ 323,114
Alternative revenue programs, net	1,759	1,314	2,351	(523)
Other balancing and memorandum accounts and regulatory mechanisms, net	(2,288)	977	(988)	413
Rental income	1,007	777	1,851	2,552
Operating revenue	$ 198,255	$ 176,174	$ 365,854	$ 325,556