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Equity Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
A summary of compensation costs charged to income and proceeds from share-based compensation, which are recorded to additional paid-in capital and common stock, by award type, are presented below for the years ended December 31:
202520242023
Compensation costs charged to income:
ESPP$360 557 378 
Restricted stock and deferred restricted stock6,084 5,066 4,269 
Total compensation costs charged to income$6,444 5,623 4,647 
ESPP proceeds$2,131 2,188 2,141 
Schedule of Restricted and Deferred Restricted Stock Awards
A summary of H2O America’s outstanding restricted and deferred restricted stock awards under the Plan as of December 31, 2025, and changes during the year ended December 31, 2025, are presented below:
UnitsWeighted-
Average Grant-
Date Fair Value
Outstanding as of January 1, 2025191,177 $65.36 
Granted175,037 48.65 
Issued(70,611)63.53 
Forfeited(17,038)58.29 
Outstanding as of December 31, 2025278,565 $52.32 
Shares vested as of December 31, 202530,162 $79.89 
Schedule of Nonvested Restricted Stock Units Activity
A summary of the status of H2O America’s nonvested restricted and deferred restricted stock awards under the plans as of December 31, 2025, and changes during the year ended December 31, 2025, are presented below:
UnitsWeighted-  Average Grant-
Date Fair Value
Nonvested as of January 1, 2025159,156 $64.30 
Granted175,037 48.65 
Vested(76,725)68.03 
Forfeited(9,065)58.29 
Nonvested as of December 31, 2025248,403 $52.34