Maine NPDES permit search
Status, expiry and violations for 93 municipal wastewater permits · issued by Maine DEP as MEPDES permits
In short
How do I look up an NPDES permit in Maine?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search DEP’s waste discharge license lists. EPA’s ECHO database shows the monitoring results and violations of every permit. The 443 industrial permits in Maine are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
50
Administratively continued
34
Expired
9
Plants with effluent violations, 3 years
63
Where to find official Maine NPDES records
Maine Department of Environmental Protection (Maine DEP) runs the NPDES program in Maine under authorization from EPA Region 1, as the Maine Pollutant Discharge Elimination System (MEPDES). It issues and enforces the permits and keeps the official file: applications, permits, fact sheets and monitoring reports. Maine DEP website ↗
permits
DEP has no online permit search. Its PDF lists of licensed dischargers by town (dated 2015) give each facility’s license and MEPDES numbers; the license documents need a request to the Water Bureau.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Permit numbers
- Each facility has a DEP waste discharge license number, W- plus six digits, and a MEPDES number in EPA’s format: W-002710 and ME0101389 for the Anson-Madison Sanitary District.
- Violations and enforcement
- DEP’s monthly enforcement reports ↗
Industrial and commercial NPDES permits in Maine
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 443 individual permits in force for industrial and commercial facilities in Maine (manufacturers, food processors, mines, power plants, landfills), 21 of them major dischargers, plus 42 facilities covered by a general permit, mostly for stormwater. 95 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 443 industrial permits in Maine
Search every industrial and commercial discharger in Maine by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Maine: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Maine wastewater plants
63 of the 93 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 73 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 6 formal cases naming Maine wastewater plants, 1 of them since fiscal year 2020, with $27,500 in penalties assessed. Enforcement cases in Maine →
Permit renewals by year
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.
Largest permit holders in Maine
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Bangor Wastewater Treatment Facility | Bangor | 7.09 | 18 | ME0100781 | Effective | Jul 2031 | 14 |
| Anson Madison Wastewater Treatment Facility | Madison | 0.67 | 7.84 | ME0101389 | Effective | Apr 2031 | 2 |
| Brewer Wastewater Treatment Facility | Brewer | 1.47 | 5.19 | ME0100072 | Effective | Nov 2029 | 2 |
| Westbrook Waste Water Treatmemt Facility | Westbrook | 3.05 | 4.54 | ME0100846 | Administratively continued | Jul 2022 | 26 |
| Gardiner WWTF | Gardiner | 0.97 | 4.5 | ME0101702 | Administratively continued | Oct 2021 | 1 |
| Sanford Wastewater Treatment Facility | Sanford | 1.42 | 4.4 | ME0100617 | Administratively continued | Jul 2023 | 4 |
| Old Orchard Beach Wastewater Treatment Facility | Old Orchard Beach | 0.99 | 3.5 | ME0101524 | Administratively continued | May 2020 | 12 |
| Old Town Wastewater Treatment Facility | Old Town | 1.09 | 3.5 | ME0100471 | Effective | Sep 2029 | 2 |
| York Wastewater Treatment Facility | York | 0.99 | 3 | ME0101222 | Effective | Mar 2030 | 12 |
| Rockland Wastewater Treatment Facility | Rockland | 0.1 | 2.9 | ME0100595 | Administratively continued | Jul 2021 | 3 |
Maine NPDES permits: questions
NPDES permit search in other states
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 October 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · Inflow and infiltration · Sludge dewatering · all terms