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Pay vs Performance Disclosure
6 Months Ended 12 Months Ended
Dec. 31, 2025
Jul. 01, 2025
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Pay vs Performance Disclosure              
Pay vs Performance Disclosure, Table    
Value of Initial Fixed $100 Investment Based on:
Year
SCT
Total
 for Mr. Thornburg ($)
 Compensation
 Actually
 Paid to Mr. Thornburg
 ($)
SCT
Total
for Mr.
Walters
 ($)
Compensation Actually
Paid to Mr. Walters
 ($)(1)
Average
SCT Total
for Non-CEO NEOs ($) (2)
Average
Compensation Actually Paid to Non-CEO NEOs
($) (1)(2)
TSR
 ($)

S&P 1000 Utilities Index
 TSR
($)(3)
Net Income (thousands) ($)
Adjusted Diluted EPS
($) (4)
20253,065,2701,958,5552,872,9421,866,9871,321,3431,057,62680.00152.99102,5782.99
20244,047,6081,809,4401,411,7361,084,12777.73131.5093,9672.93
20234,210,7363,040,1791,350,918967,212100.38105.7984,9872.76
20223,185,9954,590,645992,6471,043,718122.09120.3373,8282.37
20213,288,8862,754,516995,6701,004,775107.66121.0160,4781.87
       
Company Selected Measure Name     Adjusted Diluted EPS        
Named Executive Officers, Footnote     The following individuals are our other Named Executive Officers for each fiscal year:
YearCEONon-CEO NEOs
2025
Eric Thornburg (CEO 1) & Andrew Walters (CEO 2)
Willie Brown, Bruce Hauk, Kristen Johnson, and Ann Kelly
2024
Eric Thornburg
Bruce Hauk, Kristen Johnson, Tanya Moniz-Witten, and Andrew Walters
2023Eric ThornburgWillie Brown, Bruce Hauk, Kristen Johnson, and Andrew Walters
2022Eric ThornburgAndrew Gere, Bruce Hauk, Kristen Johnson, James Lynch, Andrew Walters, and Maureen Westbrook
2021Eric ThornburgAndrew Gere, James Lynch, Andrew Walters, and Maureen Westbrook
       
Adjustment To PEO Compensation, Footnote     Compensation actually paid to our named executive officers represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, adjusted as follows:
2021
2022
20232024
2025
2025
Adjustments
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Mr. WaltersAverage non-CEO NEOs
Deduction for Amounts Reported under the “Stock Awards” and “Option Awards” Columns in the Summary Compensation Table for Applicable FY(1,282,631)(262,473)(1,692,981)(311,991)(1,709,660)(287,875)(1,670,168)(390,421)(1,783,435)(1,690,019)(376,344)
Increase based on ASC 718 Fair Value of Awards Granted during Applicable FY that Remain Unvested as of Applicable FY End, determined as of Applicable FY End1,242,978262,2082,197,855261,3031,376,320233,398928,369279,8731,542,670990,028335,150
Increase based on ASC 718 Fair Value of Awards Granted during Applicable FY that Vested during Applicable FY, determined as of Vesting Date8,0197,2006,2996,7957,158
2021
2022
20232024
2025
2025
Adjustments
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Mr. WaltersAverage non-CEO NEOs
Increase/deduction for Awards Granted during Prior FY that were Outstanding and Unvested as of Applicable FY End, determined based on change in ASC 718 Fair Value from Prior FY End to Applicable FY End(215,751)(20,597)316,75323,261(459,915)(73,131)(639,460)(73,661)(110,288)(22,411)(10,035)
Increase/deduction for Awards Granted during Prior FY that Vested During Applicable FY, determined based on change in ASC 718 Fair Value from Prior FY End to Vesting Date (128,319)(8,834)136,732(220)(213,231)(25,328)(657,019)(65,131)(531,104)(258,013)(83,127)
Deduction of ASC 718 Fair Value of Awards Granted during Prior FY that were Forfeited during Applicable FY, determined as of Prior FY End(28,750)
Increase based on Dividends or Other Earnings Paid during Applicable FY prior to Vesting Date
Increase based on Incremental Fair Value of Options/SARs Modified during Applicable FY
Deduction for Change in the Actuarial Present Values reported under the “Change in Pension Value and Non qualified Deferred Compensation Earnings” Column of the Summary Compensation Table for Applicable FY(634,950)(84,225)(49,697)(6,469)(688,654)(297,356)(750,912)(146,317)(806,463)(25,540)(212,731)
Increase for Service Cost and, if applicable, Prior Service Cost for Pension Plans484,303103,258495,988106,739524,58357,427551,02258,151581,90572,787
2021
2022
20232024
2025
2025
Adjustments
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Mr. WaltersAverage non-CEO NEOs
Increase for Above-Market or Preferential
Earnings on Deferred Compensation that is not Tax Qualified
11,7492,8603,1023,426
TOTAL ADJUSTMENTS(534,370)9,1051,404,65051,073(1,170,557)(383,706)(2,238,168)(327,609)(1,106,715)(1,005,955)(263,716)
       
Non-PEO NEO Average Total Compensation Amount     $ 1,321,343 $ 1,411,736 $ 1,350,918 $ 992,647 $ 995,670
Non-PEO NEO Average Compensation Actually Paid Amount     $ 1,057,626 1,084,127 967,212 1,043,718 1,004,775
Adjustment to Non-PEO NEO Compensation Footnote     Compensation actually paid to our named executive officers represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, adjusted as follows:
2021
2022
20232024
2025
2025
Adjustments
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Mr. WaltersAverage non-CEO NEOs
Deduction for Amounts Reported under the “Stock Awards” and “Option Awards” Columns in the Summary Compensation Table for Applicable FY(1,282,631)(262,473)(1,692,981)(311,991)(1,709,660)(287,875)(1,670,168)(390,421)(1,783,435)(1,690,019)(376,344)
Increase based on ASC 718 Fair Value of Awards Granted during Applicable FY that Remain Unvested as of Applicable FY End, determined as of Applicable FY End1,242,978262,2082,197,855261,3031,376,320233,398928,369279,8731,542,670990,028335,150
Increase based on ASC 718 Fair Value of Awards Granted during Applicable FY that Vested during Applicable FY, determined as of Vesting Date8,0197,2006,2996,7957,158
2021
2022
20232024
2025
2025
Adjustments
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Mr. WaltersAverage non-CEO NEOs
Increase/deduction for Awards Granted during Prior FY that were Outstanding and Unvested as of Applicable FY End, determined based on change in ASC 718 Fair Value from Prior FY End to Applicable FY End(215,751)(20,597)316,75323,261(459,915)(73,131)(639,460)(73,661)(110,288)(22,411)(10,035)
Increase/deduction for Awards Granted during Prior FY that Vested During Applicable FY, determined based on change in ASC 718 Fair Value from Prior FY End to Vesting Date (128,319)(8,834)136,732(220)(213,231)(25,328)(657,019)(65,131)(531,104)(258,013)(83,127)
Deduction of ASC 718 Fair Value of Awards Granted during Prior FY that were Forfeited during Applicable FY, determined as of Prior FY End(28,750)
Increase based on Dividends or Other Earnings Paid during Applicable FY prior to Vesting Date
Increase based on Incremental Fair Value of Options/SARs Modified during Applicable FY
Deduction for Change in the Actuarial Present Values reported under the “Change in Pension Value and Non qualified Deferred Compensation Earnings” Column of the Summary Compensation Table for Applicable FY(634,950)(84,225)(49,697)(6,469)(688,654)(297,356)(750,912)(146,317)(806,463)(25,540)(212,731)
Increase for Service Cost and, if applicable, Prior Service Cost for Pension Plans484,303103,258495,988106,739524,58357,427551,02258,151581,90572,787
2021
2022
20232024
2025
2025
Adjustments
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Average non-CEO NEOs
Mr. Thornburg
Mr. WaltersAverage non-CEO NEOs
Increase for Above-Market or Preferential
Earnings on Deferred Compensation that is not Tax Qualified
11,7492,8603,1023,426
TOTAL ADJUSTMENTS(534,370)9,1051,404,65051,073(1,170,557)(383,706)(2,238,168)(327,609)(1,106,715)(1,005,955)(263,716)
       
Compensation Actually Paid vs. Total Shareholder Return    
The line graphs below compare: (i) the compensation actually paid to Mr. Thornburg (CEO 1) who retired effective July 1, 2025, and to Mr. Walters, our current CEO (CEO 2), and the average of the compensation actually paid to our remaining named executive officers, with (ii) our cumulative TSR, (iii) Comparator Group TSR, (iv) our Net Income, and (v) our Adjusted Diluted EPS, in each case, for the fiscal years ended December 31, 2021, 2022, 2023, 2024, and 2025.
TSR amounts reported in the graph assume an initial fixed investment of $100, and that all dividends, if any, were reinvested.
H2O PvP TSR.jpg
       
Compensation Actually Paid vs. Net Income    
The line graphs below compare: (i) the compensation actually paid to Mr. Thornburg (CEO 1) who retired effective July 1, 2025, and to Mr. Walters, our current CEO (CEO 2), and the average of the compensation actually paid to our remaining named executive officers, with (ii) our cumulative TSR, (iii) Comparator Group TSR, (iv) our Net Income, and (v) our Adjusted Diluted EPS, in each case, for the fiscal years ended December 31, 2021, 2022, 2023, 2024, and 2025.
TSR amounts reported in the graph assume an initial fixed investment of $100, and that all dividends, if any, were reinvested.
H2O PvP Net Income.jpg
       
Compensation Actually Paid vs. Company Selected Measure    
The line graphs below compare: (i) the compensation actually paid to Mr. Thornburg (CEO 1) who retired effective July 1, 2025, and to Mr. Walters, our current CEO (CEO 2), and the average of the compensation actually paid to our remaining named executive officers, with (ii) our cumulative TSR, (iii) Comparator Group TSR, (iv) our Net Income, and (v) our Adjusted Diluted EPS, in each case, for the fiscal years ended December 31, 2021, 2022, 2023, 2024, and 2025.
TSR amounts reported in the graph assume an initial fixed investment of $100, and that all dividends, if any, were reinvested.
H2O PvP EPS_updated.jpg
       
Total Shareholder Return Vs Peer Group    
The line graphs below compare: (i) the compensation actually paid to Mr. Thornburg (CEO 1) who retired effective July 1, 2025, and to Mr. Walters, our current CEO (CEO 2), and the average of the compensation actually paid to our remaining named executive officers, with (ii) our cumulative TSR, (iii) Comparator Group TSR, (iv) our Net Income, and (v) our Adjusted Diluted EPS, in each case, for the fiscal years ended December 31, 2021, 2022, 2023, 2024, and 2025.
TSR amounts reported in the graph assume an initial fixed investment of $100, and that all dividends, if any, were reinvested.
H2O PvP TSR.jpg
       
Tabular List, Table     Adjusted diluted EPS;
Capital additions;
Customer satisfaction;
Employee satisfaction;
Environmental leadership – water quality;
Return on equity; and
rTSR percentile positioning.
       
Total Shareholder Return Amount     $ 80.00 77.73 100.38 122.09 107.66
Peer Group Total Shareholder Return Amount     152.99 131.50 105.79 120.33 121.01
Net Income (Loss)     $ 102,578,000 $ 93,967,000 $ 84,987,000 $ 73,828,000 $ 60,478,000
Company Selected Measure Amount | $ / shares     2.99 2.93 2.76 2.37 1.87
PEO Name Andrew F. Walters Eric W. Thornburg   Eric Thornburg Eric Thornburg Eric Thornburg Eric Thornburg
Additional 402(v) Disclosure     TSR is cumulative for the measurement periods beginning on December 31, 2020 and ending on December 31 of each of 2025, 2024, 2023, 2022, and 2021, respectively, calculated in accordance with Item 201(e) of Regulation S-K. The S&P 1000 Utilities Index is the same index we use in our relative TSR plan to help determine compensation for our named executive officers and is described as such in the Compensation Discussion and Analysis section.        
Measure:: 1              
Pay vs Performance Disclosure              
Name     •Adjusted diluted EPS        
Non-GAAP Measure Description     Adjusted Diluted EPS is a non-GAAP measure that is derived from diluted earnings per share reported in H2O America's audited financial statements adjusted to exclude certain compensation-related items, gains and losses on asset sales, changes in the fair value of equity investments, impairments of long-lived assets, and acquisition-related costs. Adjusted Diluted EPS presented above is calculated as defined in H2O America's incentive plans which may provide for different adjustments compared to the adjustments the Corporation uses to calculate Adjusted Diluted EPS that is presented in earnings releases, investor presentations, and other external communications. Refer to Appendix A of this Proxy Statement for a reconciliation to the most directly comparable GAAP measure.        
Measure:: 2              
Pay vs Performance Disclosure              
Name     •Capital additions        
Measure:: 3              
Pay vs Performance Disclosure              
Name     •Customer satisfaction        
Measure:: 4              
Pay vs Performance Disclosure              
Name     •Employee satisfaction        
Measure:: 5              
Pay vs Performance Disclosure              
Name     •Environmental leadership – water quality        
Measure:: 6              
Pay vs Performance Disclosure              
Name     •Return on equity        
Measure:: 7              
Pay vs Performance Disclosure              
Name     •rTSR percentile positioning        
Eric Thornburg [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount     $ 3,065,270 $ 4,047,608 $ 4,210,736 $ 3,185,995 $ 3,288,886
PEO Actually Paid Compensation Amount     1,958,555 1,809,440 3,040,179 4,590,645 2,754,516
Andrew Walters [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount     2,872,942        
PEO Actually Paid Compensation Amount     1,866,987        
PEO | Eric Thornburg [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (1,106,715) (2,238,168) (1,170,557) 1,404,650 (534,370)
PEO | Eric Thornburg [Member] | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (806,463) (750,912) (688,654) (49,697) (634,950)
PEO | Eric Thornburg [Member] | Aggregate Pension Adjustments Service Cost              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     581,905 551,022 524,583 495,988 484,303
PEO | Eric Thornburg [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (1,783,435) (1,670,168) (1,709,660) (1,692,981) (1,282,631)
PEO | Eric Thornburg [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     1,542,670 928,369 1,376,320 2,197,855 1,242,978
PEO | Eric Thornburg [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (110,288) (639,460) (459,915) 316,753 (215,751)
PEO | Eric Thornburg [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0 0
PEO | Eric Thornburg [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (531,104) (657,019) (213,231) 136,732 (128,319)
PEO | Eric Thornburg [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0 0
PEO | Eric Thornburg [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0
PEO | Eric Thornburg [Member] | Equity Awards, Award Modifications During the Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0 0
PEO | Eric Thornburg [Member] | Adjustment, Increase for Above-Market or Preferential Earnings on Deferred Compensation that is not Tax Qualified [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0 0
PEO | Andrew Walters [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (1,005,955)        
PEO | Andrew Walters [Member] | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (25,540)        
PEO | Andrew Walters [Member] | Aggregate Pension Adjustments Service Cost              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Andrew Walters [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (1,690,019)        
PEO | Andrew Walters [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     990,028        
PEO | Andrew Walters [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (22,411)        
PEO | Andrew Walters [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Andrew Walters [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (258,013)        
PEO | Andrew Walters [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Andrew Walters [Member] | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Andrew Walters [Member] | Equity Awards, Award Modifications During the Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
PEO | Andrew Walters [Member] | Adjustment, Increase for Above-Market or Preferential Earnings on Deferred Compensation that is not Tax Qualified [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0        
Non-PEO NEO              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (263,716) (327,609) (383,706) 51,073 9,105
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (212,731) (146,317) (297,356) (6,469) (84,225)
Non-PEO NEO | Aggregate Pension Adjustments Service Cost              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     72,787 58,151 57,427 106,739 103,258
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (376,344) (390,421) (287,875) (311,991) (262,473)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     335,150 279,873 233,398 261,303 262,208
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (10,035) (73,661) (73,131) 23,261 (20,597)
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     7,158 6,795 6,299 7,200 8,019
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (83,127) (65,131) (25,328) (220) (8,834)
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 (28,750) 0
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0 0
Non-PEO NEO | Equity Awards, Award Modifications During the Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     0 0 0 0 0
Non-PEO NEO | Adjustment, Increase for Above-Market or Preferential Earnings on Deferred Compensation that is not Tax Qualified [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     $ 3,426 $ 3,102 $ 2,860 $ 0 $ 11,749