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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 SystemExit

Related pages:

Click on the facility/permit name to view the permit and supporting documents.

NPDES Permits Issued by EPA in Montana
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 Facility MT0020559 Final 2019-09-01 2024-08-31
Flathead Reservation (Lake County) City of Ronan Wastewater Treatment Facility MT0021474 Final 2013-07-01 2018-06-30
Flathead Reservation (Lake County) Flathead Lake Biological Station Wastewater Treatment Facility MT0023388 Final 2018-10-01 2023-09-30
Crow Indian Reservation (Big Horn County) Town of Lodge Grass Wastewater Treatment Facility MT0021890 Final 2017-05-01 2022-03-31
Crow Indian Reservation (Big Horn County) Soap Creek Oil Field Wastewater Treatment Facility MT0023183 Final 2008-06-01 2013-05-31
Flathead Reservation (Lake County) Charlo Wastewater Treatment Facility MT0022551 Final 2019-06-01 2024-05-31
Northern Cheyenne Indian Reservation (Rosebud County) Lame Deer Lagoon Wastewater Treatment Facility MT0029360 Final 2018-03-01 2022-12-31
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 Facility MT0030759 Final 2018-07-01 2023-06-30
Crow Indian Reservation (Big Horn County) City of Hardin Water Treatment Plant MT0030767 Final 2017-03-01 2021-12-31
Crow Indian Reservation (Big Horn County) Westmoreland Resources, Inc. Absaloka Mine South Extension MT0030783 Final 2014-10-01 2019-09-30
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 Facility MT0030597 Final 2020-07-01 2025-06-30
Fort Peck Reservation (Valley and Roosevelt Counties) Northern Border Pipeline Company MT0030791 Final 2013-10-01 2018-09-30
Flathead Reservation (Lake County) Keller Transport Spill Site MT0030805 Final 2021-05-01 2023-06-30
Flathead Reservation (Lake County) St. Ignatius-Southside Wastewater Treatment Facility MT0029017 Final 2018-12-01 2023-11-30
Flathead Reservation (Lake County) Jocko River Trout Hatchery Wastewater Treatment Facility MT0030546 Final 2017-01-01 2021-12-31
Crow Indian Reservation (Big Horn County) Yellowtail Dam Wastewater Treatment Facility MT0022993 Final 2016-11-01 2021-10-31
Crow Indian Reservation (Big Horn County) Yellowtail Dam Visitor Center Wastewater Treatment Facility MT0029106 Final 2016-11-01 2021-10-31
Crow Indian Reservation (Big Horn County) Sunlight Ranch Company, Little Horn Unit MT0029424 Final 2017-09-01 2022-06-30
Blackfeet Reservation (Glacier County) City of Cut Bank Water Treatment Plant MT0030562 Final 2017-06-01 2021-12-31
Ravalli GSK-Hamilton (Proposed Permit) MTPF00103 Draft n/a n/a
Various General Permit for Wastewater Lagoons in Indian Country MTG589### Final 2016-01-01 2020-12-31
Various General Permit for Wastewater Discharges Associated with Drinking Water Production in Indian Country MTDW#### Final 2019-07-31 2024-06-30