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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2026
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 29, 2026, the Company received a revised proposed decision (PD) on Cal Water’s general rate case (GRC) filed on July 8, 2024 (2024 CA GRC), which authorizes rate increases that add $90.5 million of revenue in 2026, or an increase of 10.9%. It also authorizes revenue increases of $43.2 million, or 4.7%, in 2027, and $48.9 million, or 5.1%, in 2028. The revised PD remains subject to review and may be modified in the final decision. At this time, the Company believes it is not in a position to reasonably estimate the impact of the 2024 CA GRC until a final decision is received. The CPUC is expected to adopt a final decision at its scheduled meeting on April 30, 2026, or shortly thereafter.