Maine wastewater permits expiring in 2027
6 NPDES permits · 0 MGD combined average flow
6 publicly owned wastewater treatment plants in Maine hold NPDES permits that expire during 2027, issued by Maine Department of Environmental Protection. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|
| Grand Isle WWTF | Grand Isle | 0.0052 | ME0102318 | Jan 2027 | — | 58 |
| Ashland Wastwater Treatment Facility | Ashland | 0.04 | ME0101087 | May 2027 | Aerated lagoons | 31 |
| Subsurface Wastewater Trtmnt Discharge | Bridgton | — | MEU508273 | May 2027 | Uncovered lagoons | 38 |
| Whitneyville WWTF | Whitneyville | 0.0015 | ME0102687 | Jun 2027 | — | 0 |
| Bethel Wastewater Treatment Facility | Bethel | 0.08 | ME0101176 | Dec 2027 | Uncovered lagoons | 42 |
| Passamaquoddy Water Treatment Facility | Perry | 0.0097 | ME0102211 | Dec 2027 | — | 4 |
Maine permit renewals in 2027: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.