Montana NPDES Permits
In Montana, EPA issues all NPDES permits on tribal lands (see table below). All other permits are issued by the Montana Department of Environmental Quality.
For state-issued permits, visit Montana Pollutant Discharge Elimination System
Related pages:
Click on the facility/permit name to view the permit and supporting documents.
| Location | Facility or Permit Name | Permit Number | Permit Status | Effective Date | Expiration Date |
|---|---|---|---|---|---|
| Flathead Reservation (Sanders County) | Town of Hot Springs Wastewater Treatment Facility | MT0020591 | Final | 2018-07-01 | 2023-06-30 |
| Flathead Reservation (Sanders County) | Symes Hot Springs Mineral Baths | MT0030619 | Final | 2020-08-01 | 2025-07-31 |
| Flathead Reservation (Lake County) | City of Polson Wastewater Treatment Plant | MT0020559 | Final | 2019-09-01 | 2024-08-31 |
| Blackfeet Reservation (Glacier County) | Town of Browning Wastewater Treatment Facility | MT0031835 | Final | 2024-08-01 | 2029-07-31 |
| Flathead Reservation (Lake County) | City of Ronan Wastewater Treatment Facility | MT0021474 | Final | 2022-07-01 | 2027-06-30 |
| Flathead Reservation (Lake County) | Flathead Lake Biological Station Wastewater Treatment Plant | MT0023388 | Final | 2018-10-01 | 2023-09-30 |
| Crow Indian Reservation (Big Horn County) | Town of Lodge Grass Wastewater Treatment Facility | MT0021890 | Final | 2024-02-01 | 2028-12-31 |
| Crow Indian Reservation (Big Horn County) | Soap Creek Oil Field Wastewater Treatment Facility | MT0023183 | Final | 2023-01-01 | 2027-12-31 |
| Flathead Reservation (Lake County) | Charlo Wastewater Treatment Facility | MT0022551 | Final | 2019-06-01 | 2024-05-31 |
| Northern Cheyenne Indian Reservation (Rosebud County) | NCUC Lame Deer Lagoon Wastewater Treatment Facility | MT0029360 | Final | 2024-09-01 | 2029-06-30 |
| Flathead Reservation (Lake County) | Woodcock Home Wastewater Treatment Facility | MT0030554 | Final | 2020-04-01 | 2025-03-31 |
| Crow Indian Reservation (Big Horn County) | City of Hardin Wastewater Treatment Plant | MT0030759 | Final | 2023-12-01 | 2028-11-30 |
| Crow Indian Reservation (Big Horn County) | Absaloka Mining LLC, Absaloka Mine South Extension Coal Mine | MT0030783 | Final | 2023-11-01 | 2028-09-30 |
| Fort Peck Reservation (Roosevelt County) | City of Wolf Point Wastewater Treatment Facility | MT0030571 | Final | 2018-07-01 | 2023-06-30 |
| Fort Peck Reservation (Roosevelt County) | City of Poplar Wastewater Treatment Plant | MT0030597 | Final | 2020-07-01 | 2025-06-30 |
| Fort Peck Reservation (Valley and Roosevelt Counties) | TC Energy Northern Border Pipeline | MT0030791 | Final | 2022-10-01 | 2027-09-30 |
| Flathead Reservation (Lake County) | Keller Transport Spill Site | MT0030805 | Final | 2023-10-01 | 2028-09-30 |
| Flathead Reservation (Lake County) | St. Ignatius-Southside Wastewater Treatment Plant | MT0029017 | Final | 2018-12-01 | 2023-11-30 |
| Flathead Reservation (Lake County) | Jocko River Trout Hatchery | MT0030546 | Final | 2023-07-01 | 2028-06-30 |
| Crow Indian Reservation (Big Horn County) | Yellowtail Dam Wastewater Treatment Plant | MT0022993 | Final | 2023-03-01 | 2028-02-29 |
| Crow Indian Reservation (Big Horn County) | Sunlight Ranch Company, Little Horn Unit | MT0029424 | Final | 2017-09-01 | 2022-06-30 |
| Ravalli | GSK-Hamilton | MTPF00103 | Final | 2021-01-24 | n/a |
| Flathead Reservation (Lake County) | Wild Horse Hot Springs | MT0000005 | Final | 2024-04-01 | 2029-03-31 |
| Various | General Permit for Wastewater Lagoons in Indian Country | MTG589### | Final | 2022-04-01 | 2027-03-31 |
| Various | General Permit for Wastewater Discharges Associated with Drinking Water Production in Indian Country | MTDW#### | Final | 2019-07-31 | 2024-06-30 |