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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |
​ | Year(1) | ​ | ​ | ​ | Summary Comp. Table for CEO $ | ​ | ​ | ​ | Comp. Actually Paid to CEO(2) $ | ​ | ​ | ​ | Average Summary Comp. Table Total for Non-CEO NEOs $ | ​ | ​ | ​ | Average Comp. Actually Paid to Non-CEO NEOs(2) $ | ​ | ​ | ​ | Value of Initial Fixed $100 Investment Based on: | ​ | ​ | ​ | Net Income $M(4) | ​ | ​ | ​ | Budget to Actual Performance (EPS)(5) | ​
​ | TSR $ | ​ | ​ | ​ | Peer Group TSR(3) $ | ​ | ​
​ | 2025 | ​ | ​ | ​ | ​ | $ | 6,875,256 | ​ | ​ | ​ | ​ | ​ | $ | 3,250,025 | ​ | ​ | ​ | ​ | ​ | $ | 1,407,430 | ​ | ​ | ​ | ​ | ​ | $ | 891,721 | ​ | ​ | ​ | ​ | ​ | $ | 90.04 | ​ | ​ | ​ | ​ | ​ | $ | 89.87 | ​ | ​ | ​ | ​ | ​ | $ | 127.8 | ​ | ​ | ​ | ​ | ​ | ​ | (4.9)% | ​ | ​
​ | 2024 | ​ | ​ | ​ | ​ | ​ | 4,803,389 | ​ | ​ | ​ | ​ | ​ | ​ | 4,682,415 | ​ | ​ | ​ | ​ | ​ | ​ | 943,423 | ​ | ​ | ​ | ​ | ​ | ​ | 859,492 | ​ | ​ | ​ | ​ | ​ | ​ | 97.46 | ​ | ​ | ​ | ​ | ​ | ​ | 92.93 | ​ | ​ | ​ | ​ | ​ | ​ | 190.8 | ​ | ​ | ​ | ​ | ​ | ​ | 53.0% | ​ | ​
​ | 2023 | ​ | ​ | ​ | ​ | ​ | 4,856,752 | ​ | ​ | ​ | ​ | ​ | ​ | 3,689,961 | ​ | ​ | ​ | ​ | ​ | ​ | 1,003,883 | ​ | ​ | ​ | ​ | ​ | ​ | 704,548 | ​ | ​ | ​ | ​ | ​ | ​ | 107.84 | ​ | ​ | ​ | ​ | ​ | ​ | 105.53 | ​ | ​ | ​ | ​ | ​ | ​ | 51.9 | ​ | ​ | ​ | ​ | ​ | ​ | (52.1)% | ​ | ​
​ | 2022 | ​ | ​ | ​ | ​ | ​ | 3,351,529 | ​ | ​ | ​ | ​ | ​ | ​ | 3,111,318 | ​ | ​ | ​ | ​ | ​ | ​ | 820,950 | ​ | ​ | ​ | ​ | ​ | ​ | 829,540 | ​ | ​ | ​ | ​ | ​ | ​ | 123.71 | ​ | ​ | ​ | ​ | ​ | ​ | 123.42 | ​ | ​ | ​ | ​ | ​ | ​ | 96.0 | ​ | ​ | ​ | ​ | ​ | ​ | (1.7)% | ​ | ​
​ | 2021 | ​ | ​ | ​ | ​ | ​ | 3,718,087 | ​ | ​ | ​ | ​ | ​ | ​ | 4,495,501 | ​ | ​ | ​ | ​ | ​ | ​ | 1,204,755 | ​ | ​ | ​ | ​ | ​ | ​ | 1,050,610 | ​ | ​ | ​ | ​ | ​ | ​ | 144.06 | ​ | ​ | ​ | ​ | ​ | ​ | 144.46 | ​ | ​ | ​ | ​ | ​ | $ | 101.1 | ​ | ​ | ​ | ​ | ​ | ​ | 6.5% | ​ | ​
​ (1) The CEO for all five reporting years was Martin Kropelnicki. The other NEOs were: ​
​ | Year | ​ | ​ | ​ | CEO | ​ | ​ | ​ | Other NEOs | ​
​ | 2025 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | James Lynch, Shawn Bunting, Michael Luu, and Shannon Dean | ​
​ | 2024 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | James Lynch, David Healey, Shawn Bunting, Michael Luu, and Shannon Dean | ​
​ | 2023 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | David Healey, Thomas Smegal III, Paul Townsley, Michael Luu, Ronald Webb, and Shawn Bunting | ​
​ | 2022 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | Thomas Smegal III, Paul Townsley, Robert Kuta and Michael Luu | ​
​ | 2021 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | Thomas Smegal III, Paul Townsley, Robert Kuta and Lynne McGhee | ​
​ (2) Amounts reported in this column are based on total compensation reported for our CEOs and the average of the total compensation of our other NEOs in the Summary Compensation Table for the indicated reporting year and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company’s methodology used for financial reporting purposes. ​ (3) Amounts reported in this column represent returns on an initial $100 investment based on the Robert W. Baird Water Utility Index, which we chose as peer group for purposes of the Pay versus Performance table. ​ (4) Net income in 2024 includes $64.0 million of interim rate relief related to 2023 that was recorded in 2024 due to the delayed 2021 California General Rate Case decision. ​ (5) In accordance with SEC rules, the Group is required to include in the Pay versus Performance table the “most important” financial performance measure (as determined by the company) used to link compensation actually paid to our CEO and other named executive officers to Group performance for the most recently completed fiscal year. The Group determined that the annual budget-to-actual performance of the Group meets this requirement. This performance measure compares the actual diluted earnings per share to the forecasted diluted earnings per share for the calendar year. The forecasted diluted earnings per share is adopted during the budget process by the Board of Directors each year. By adhering to budgets, management is able to demonstrate to the Board, stockholders and customers that the Group is effective at managing controllable costs and has the ability to efficiently execute its business plan. Chairman, President & CEO Summary Compensation Table (SCT) Total to Compensation Actually Paid (CAP) Reconciliation
​ | ​ | ​ | ​ | ​ | 2025 $ | ​
​ | Summary Compensation Table Reported Compensation | ​ | ​ | ​ | ​ | ​ | 6,875,256 | ​ | ​
​ | Deduction for pension values reported in SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (2,254,426) | ​ | ​
​ | Increase for pension value attributable to current year’s service and any change in pension value attributable to plan amendments made in the covered year | ​ | ​ | ​ | ​ | $ | 64,313 | ​ | ​
​ | Deduction for grant date fair value of equity awards reported in “Stock Awards” column of the SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (1,950,119) | ​ | ​
​ | Increase for the fair value as of the end of the covered year of all equity awards granted during the covered year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | 1,752,906 | ​ | ​
​ | Deduction for the change in fair value as of the end of the covered year of any equity awards granted in any prior year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | (1,258,067) | ​ | ​
​ | Increase for the change in fair value as of the vesting date of any equity awards granted in any prior year for which all applicable vesting conditions were satisfied during the covered year | ​ | ​ | ​ | ​ | ​ | 10,293 | ​ | ​
​ | Increase for the dollar value of any dividends or other earnings paid on stock or option awards in the covered year prior to the vesting date that are not otherwise reflected in the fair value of such award | ​ | ​ | ​ | ​ | ​ | 9,868 | ​ | ​
​ | Total Compensation Actually Paid | ​ | ​ | ​ | ​ | ​ | 3,250,025 | ​ | ​
Average Non-Chairman, President & CEO NEO SCT Total to CAP Reconciliation
​ | ​ | ​ | ​ | ​ | 2025 $ | ​
​ | Summary Compensation Table Reported Compensation | ​ | ​ | ​ | ​ | ​ | 1,407,430 | ​ | ​
​ | Deduction for pension values reported in SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (406,712) | ​ | ​
​ | Increase for pension value attributable to current year’s service and any change in pension value attributable to plan amendments made in the covered year | ​ | ​ | ​ | ​ | ​ | 56,108 | ​ | ​
​ | Deduction for grant date fair value of equity awards reported in “Stock Awards” column of the SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (272,015) | ​ | ​
​ | Increase for the fair value as of the end of the covered year of all equity awards granted during the covered year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | 244,925 | ​ | ​
​ | Deduction for the change in fair value as of the end of the covered year of any equity awards granted in any prior year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | (140,719) | ​ | ​
​ | Increase for the change in fair value as of the vesting date of any equity awards granted in any prior year for which all applicable vesting conditions were satisfied during the covered year | ​ | ​ | ​ | ​ | ​ | 1,387 | ​ | ​
​ | Increase for the dollar value of any dividends or other earnings paid on stock or option awards in the covered year prior to the vesting date that are not otherwise reflected in the fair value of such award | ​ | ​ | ​ | ​ | ​ | 1,318 | ​ | ​
​ | Total Compensation Actually Paid | ​ | ​ | ​ | ​ | ​ | 891,721 | ​ | ​
Company Selected Measure Name |  | Budget toActualPerformance(EPS) |  |  |
Named Executive Officers, Footnote | (1) The CEO for all five reporting years was Martin Kropelnicki. The other NEOs were:
​ | Year | ​ | ​ | ​ | CEO | ​ | ​ | ​ | Other NEOs | ​
​ | 2025 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | James Lynch, Shawn Bunting, Michael Luu, and Shannon Dean | ​
​ | 2024 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | James Lynch, David Healey, Shawn Bunting, Michael Luu, and Shannon Dean | ​
​ | 2023 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | David Healey, Thomas Smegal III, Paul Townsley, Michael Luu, Ronald Webb, and Shawn Bunting | ​
​ | 2022 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | Thomas Smegal III, Paul Townsley, Robert Kuta and Michael Luu | ​
​ | 2021 | ​ | ​ | ​ | Martin Kropelnicki | ​ | ​ | ​ | Thomas Smegal III, Paul Townsley, Robert Kuta and Lynne McGhee | ​
Peer Group Issuers, Footnote | (3) Amounts reported in this column represent returns on an initial $100 investment based on the Robert W. Baird Water Utility Index, which we chose as peer group for purposes of the Pay versus Performance table. |  |  |  |
PEO Total Compensation Amount | $ 6,875,256 | $ 4,803,389 | $ 4,856,752 | $ 3,351,529 | $ 3,718,087
PEO Actually Paid Compensation Amount | $ 3,250,025 | 4,682,415 | 3,689,961 | 3,111,318 | 4,495,501
Adjustment To PEO Compensation, Footnote | (2) Amounts reported in this column are based on total compensation reported for our CEOs and the average of the total compensation of our other NEOs in the Summary Compensation Table for the indicated reporting year and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company’s methodology used for financial reporting purposes. Chairman, President & CEO Summary Compensation Table (SCT) Total to Compensation Actually Paid (CAP) Reconciliation
​ | ​ | ​ | ​ | ​ | 2025 $ | ​
​ | Summary Compensation Table Reported Compensation | ​ | ​ | ​ | ​ | ​ | 6,875,256 | ​ | ​
​ | Deduction for pension values reported in SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (2,254,426) | ​ | ​
​ | Increase for pension value attributable to current year’s service and any change in pension value attributable to plan amendments made in the covered year | ​ | ​ | ​ | ​ | $ | 64,313 | ​ | ​
​ | Deduction for grant date fair value of equity awards reported in “Stock Awards” column of the SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (1,950,119) | ​ | ​
​ | Increase for the fair value as of the end of the covered year of all equity awards granted during the covered year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | 1,752,906 | ​ | ​
​ | Deduction for the change in fair value as of the end of the covered year of any equity awards granted in any prior year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | (1,258,067) | ​ | ​
​ | Increase for the change in fair value as of the vesting date of any equity awards granted in any prior year for which all applicable vesting conditions were satisfied during the covered year | ​ | ​ | ​ | ​ | ​ | 10,293 | ​ | ​
​ | Increase for the dollar value of any dividends or other earnings paid on stock or option awards in the covered year prior to the vesting date that are not otherwise reflected in the fair value of such award | ​ | ​ | ​ | ​ | ​ | 9,868 | ​ | ​
​ | Total Compensation Actually Paid | ​ | ​ | ​ | ​ | ​ | 3,250,025 | ​ | ​
Non-PEO NEO Average Total Compensation Amount | $ 1,407,430 | 943,423 | 1,003,883 | 820,950 | 1,204,755
Non-PEO NEO Average Compensation Actually Paid Amount | $ 891,721 | 859,492 | 704,548 | 829,540 | 1,050,610
Adjustment to Non-PEO NEO Compensation Footnote | (2) Amounts reported in this column are based on total compensation reported for our CEOs and the average of the total compensation of our other NEOs in the Summary Compensation Table for the indicated reporting year and adjusted as shown in the table below. Fair value of equity awards was computed in accordance with the Company’s methodology used for financial reporting purposes. Average Non-Chairman, President & CEO NEO SCT Total to CAP Reconciliation
​ | ​ | ​ | ​ | ​ | 2025 $ | ​
​ | Summary Compensation Table Reported Compensation | ​ | ​ | ​ | ​ | ​ | 1,407,430 | ​ | ​
​ | Deduction for pension values reported in SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (406,712) | ​ | ​
​ | Increase for pension value attributable to current year’s service and any change in pension value attributable to plan amendments made in the covered year | ​ | ​ | ​ | ​ | ​ | 56,108 | ​ | ​
​ | Deduction for grant date fair value of equity awards reported in “Stock Awards” column of the SCT for the covered year | ​ | ​ | ​ | ​ | ​ | (272,015) | ​ | ​
​ | Increase for the fair value as of the end of the covered year of all equity awards granted during the covered year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | 244,925 | ​ | ​
​ | Deduction for the change in fair value as of the end of the covered year of any equity awards granted in any prior year that are outstanding and unvested as of the end of such covered year | ​ | ​ | ​ | ​ | ​ | (140,719) | ​ | ​
​ | Increase for the change in fair value as of the vesting date of any equity awards granted in any prior year for which all applicable vesting conditions were satisfied during the covered year | ​ | ​ | ​ | ​ | ​ | 1,387 | ​ | ​
​ | Increase for the dollar value of any dividends or other earnings paid on stock or option awards in the covered year prior to the vesting date that are not otherwise reflected in the fair value of such award | ​ | ​ | ​ | ​ | ​ | 1,318 | ​ | ​
​ | Total Compensation Actually Paid | ​ | ​ | ​ | ​ | ​ | 891,721 | ​ | ​
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |  |
Tabular List, Table | Tabular List of Performance Metrics The following are the most important financial performance measures (and non-financial performance measures), as determined by the Group, that link compensation actually paid to our NEOs to the Group’s performance for the most recently completed fiscal year.
​ | Budget to Actual Performance (EPS) | ​
​ | Stockholder Return | ​
​ | Infrastructure Improvement and Utility Plant Investment | ​
​ | Customer Service and Support | ​
​ | Emergency Preparedness and Safety | ​
​ | Water Quality and Public Health | ​
​ | PFAS Investment and Recovery | ​
Total Shareholder Return Amount | $ 90.04 | 97.46 | 107.84 | 123.71 | 144.06
Peer Group Total Shareholder Return Amount | 89.87 | 92.93 | 105.53 | 123.42 | 144.46
Net Income (Loss) | $ 127,800,000 | $ 190,800,000 | $ 51,900,000 | $ 96,000,000 | $ 101,100,000
Company Selected Measure Amount | (4.9) | 53 | (52.1) | (1.7) | 6.5
PEO Name | Martin Kropelnicki |  |  |  |
Net Income Loss Interim Rate | $ 64,000,000 |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Budget to Actual Performance (EPS) |  |  |  |
Non-GAAP Measure Description | (5) In accordance with SEC rules, the Group is required to include in the Pay versus Performance table the “most important” financial performance measure (as determined by the company) used to link compensation actually paid to our CEO and other named executive officers to Group performance for the most recently completed fiscal year. The Group determined that the annual budget-to-actual performance of the Group meets this requirement. This performance measure compares the actual diluted earnings per share to the forecasted diluted earnings per share for the calendar year. The forecasted diluted earnings per share is adopted during the budget process by the Board of Directors each year. By adhering to budgets, management is able to demonstrate to the Board, stockholders and customers that the Group is effective at managing controllable costs and has the ability to efficiently execute its business plan. |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Stockholder Return |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Infrastructure Improvement and Utility Plant Investment |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Customer Service and Support |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Emergency Preparedness and Safety |  |  |  |
Measure:: 6 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Water Quality and Public Health |  |  |  |
Measure:: 7 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | PFAS Investment and Recovery |  |  |  |
PEO | 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 | $ (2,254,426) |  |  |  |
PEO | Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 64,313 |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (1,950,119) |  |  |  |
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 1,752,906 |  |  |  |
PEO | 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 | (1,258,067) |  |  |  |
PEO | 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 | 10,293 |  |  |  |
PEO | 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 | 9,868 |  |  |  |
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 | (406,712) |  |  |  |
Non-PEO NEO | Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 56,108 |  |  |  |
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 | (272,015) |  |  |  |
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 | 244,925 |  |  |  |
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 | (140,719) |  |  |  |
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 | 1,387 |  |  |  |
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 | $ 1,318 |  |  |  |

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