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FINANCIAL STATEMENT SCHEDULE - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating revenue | $ 800,590 | $ 748,439 | $ 670,363
Operating expense: |  |  |
Administrative and general | 125,998 | 105,830 | 98,656
Property taxes and other non-income taxes | 37,686 | 35,928 | 34,475
Total operating expense | 623,063 | 577,936 | 520,928
Operating income | 177,527 | 170,503 | 149,435
Other (expense) income: |  |  |
Interest on long-term debt and other interest expense | (72,575) | (71,390) | (66,144)
Other, net | 3,545 | 55 | 8,882
Income tax benefit | 12,355 | 8,970 | 5,956
Net income | 102,578 | 93,967 | 84,987
Other comprehensive income, net | (493) | 169 | 314
Comprehensive income | 102,085 | 94,136 | 85,301
H2O America |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating revenue | 0 | 0 | 0
Operating expense: |  |  |
Administrative and general | 4,664 | 5,568 | 2,239
Property taxes and other non-income taxes | 118 | 388 | 80
Total operating expense | 4,782 | 5,956 | 2,319
Operating income | (4,782) | (5,956) | (2,319)
Other (expense) income: |  |  |
Interest on long-term debt and other interest expense | (17,862) | (18,022) | (17,692)
Interest income on intercompany notes receivable | 6,292 | 6,756 | 3,862
Other, net | (4,613) | (3,456) | 1,034
Loss before income taxes and equity earnings from subsidiaries | (20,965) | (20,678) | (15,115)
Income tax benefit | (6,015) | (5,727) | (4,294)
Equity earnings from subsidiaries, net of taxes | 117,528 | 108,918 | 95,808
Net income | $ 102,578 | $ 93,967 | $ 84,987

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