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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company’s 2024 Equity Incentive Plan (2024 Equity Plan) was adopted by the Board of Directors and approved by stockholders on May 29, 2024. The Company reserved 1,600,000 shares of common stock for awards the Company is authorized to issue pursuant to the 2024 Equity Plan. In addition, the Board of Directors reauthorized 158,950 shares for issuance under its legacy equity incentive plan. In March of 2025, the Company granted RSAs to Officers and members of the Board of Directors (Directors). Generally, an RSA represents the right to receive a share of the Company’s common stock and is valued based on the fair market value of the Company’s common stock at the date of grant. The 2025 RSAs granted to Officers vest over 36 months with the first 12 months cliff vesting and the remaining RSAs vesting quarterly thereafter. RSAs granted to the Directors in 2025 vest at the end of 12 months. The 2025 RSAs are recognized as expense evenly over 36 months for the shares granted to Officers and 12 months for the shares granted to the Directors. As of September 30, 2025, there was approximately $2.9 million of total unrecognized compensation cost related to RSAs. The cost is expected to be recognized over a weighted average period of 1.5 years. A summary of the status of the outstanding RSAs as of September 30, 2025 is presented below:
| Number of RSA Shares |  | Weighted-Average Grant-Date Fair Value
RSAs at January 1, 2025 | 70,349 |  |  | $ | 50.63 |
Granted | 60,956 |  |  | 46.57 |
Vested | (49,366) |  |  | 50.58 |
Forfeited | (969) |  |  | 49.78 |
RSAs at September 30, 2025 | 80,970 |  |  | $ | 47.61 |
In March of 2025, the Company granted performance-based Restricted Stock Units (RSUs) to Officers. Generally, an RSU represents the right to receive a share of the Company’s common stock. Each award reflects a target number of shares of common stock that may be issued to the award recipient. The 2025 RSU awards may be earned upon the completion of a 36-month performance period. Whether RSUs are earned at the end of the performance period will be determined based on the achievement of certain performance objectives set by the Organization and Compensation Committee of the Board of Directors in connection with the issuance of the RSUs. The 2025 performance objectives are based on the Company’s business plan covering the performance period. The two performance objectives for the 2025 to 2027 performance period include 1) achieving targets indicative of stockholder return and 2) achieving targets associated with PFAS investment in water monitoring and treatment as well as water contamination cost recovery. Depending on the results achieved during the 36-month performance period, the actual number of shares that a grant recipient receives at the end of the performance period may range from 0% to 200% of the target RSUs granted, provided that the grantee is continuously employed by the Company through the vesting date. If prior to the vesting date employment is terminated by reason of death, disability or normal retirement, then a pro rata portion of this award will vest. The RSUs are recognized as expense ratably over the 36- month performance period using a fair market value of the Company’s common stock at the date of grant and an estimated number of RSUs earned during the performance period. As of September 30, 2025, there was approximately $4.9 million of total unrecognized compensation cost related to outstanding RSUs under the program. The cost is expected to be recognized over a weighted average period of 1.7 years. A summary of the status of outstanding RSUs as of September 30, 2025 is presented below:
| Number of RSU Shares |  | Weighted-Average Grant-Date Fair Value
RSUs at January 1, 2025 | 133,666 |  |  | $ | 52.75 |
Granted | 84,039 |  |  | 46.57 |
Performance criteria adjustment | 4,352 |  |  | 45.45 |
Vested | (31,313) |  |  | 45.45 |
Forfeited | (6,079) |  |  | 51.68 |
RSUs at September 30, 2025 | 184,665 |  |  | $ | 49.43 |
The Company recorded compensation costs for the RSAs and RSUs, which are included in administrative and general operating expenses, of $1.5 million and $1.0 million for the three months ended September 30, 2025 and 2024, respectively. For the nine months ended September 30, 2025 and 2024, the Company recorded $4.1 million and $2.1 million, respectively, of compensation costs for the RSAs and RSUs.

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