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Montana NPDES Permits

In Montana, EPA issues all NPDES permits on tribal lands. See the table below for final and draft permits issued by EPA. All other permits are issued by the Montana Dept. of Environmental Quality.

For state-issued permits, visit  Montana Pollutant Discharge Elimination SystemExit


Final and draft permits

The table below contains all final (i.e. active) and draft (i.e. proposed) NPDES permits issued by EPA within Montana. It includes permits for individual facilities, general permits, and stormwater permits. Click on the facility/permit name to view the permit and supporting documents.

Montana NPDES Permits
Location Facility or Permit Name Permit Number Permit Type Permit Status Effective Date
Flathead Reservation (Sanders County) Town of Hot Springs Wastewater Treatment Facility MT0020591 Individual Draft  
Flathead Reservation (Sanders County) Town of Hot Springs Wastewater Treatment Facility MT0020591 Individual Final 07/01/2018
Flathead Reservation (Lake County) City of Polson Wastewater Treatment Facility MT0020559 Individual Final  
Flathead Reservation (Lake County) City of Ronan Wastewater Treatment Facility MT0021474 Individual Final 06/03/2013
Crow Indian Reservation (Big Horn County) Town of Lodge Grass Wastewater Treatment Facility MT0021890 Individual Final 05/01/2017
Crow Indian Reservation (Big Horn County) Soap Creek Oil Field Wastewater Treatment Facility MT0023183 Individual Final 06/01/2008
Flathead Reservation (Lake County) Charlo Wastewater Treatment Facility MT0022551 Individual Final 09/01/2012
Flathead Reservation (Lake County) Yellow Bay Wastewater Treatment Facility MT0023388 Individual Final 07/01/2012
Northern Cheyenne Indian Reservation (Rosebud County) Lame Deer Lagoon Wastewater Treatment Facility MT0029360 Individual Final 01/17/2018
Flathead Reservation (Lake County) Woodcock Home Wastewater Treatment Facility MT0030554 Individual Final 01/01/2013
Blackfeet Reservation (Glacier County) Blackfeet Community Water Treatment Plant MT0030643 Individual Final 01/01/2013
Crow Indian Reservation (Big Horn County) City of Hardin Wastewater Treatment Facility MT0030759 Individual Draft  
Crow Indian Reservation (Big Horn County) City of Hardin Wastewater Treatment Facility MT0030759 Individual Final 07/01/2018
Crow Indian Reservation (Big Horn County) City of Hardin Water Treatment Plant MT0030767 Individual Final 03/01/2017
Crow Indian Reservation (Big Horn County) Westmoreland Resources, Inc. Absaloka Mine South Extension MT0030783 Individual Final 10/01/2014
Fort Peck Reservation (Roosevelt County) City of Wolf Point Wastewater Treatment Facility MT0030571 Individual Draft  
Fort Peck Reservation (Roosevelt County) City of Wolf Point Wastewater Treatment Facility MT0030571 Individual Final 07/01/2018
Fort Peck Reservation (Valley and Roosevelt Counties) Northern Border Pipeline Company MT0030791 Individual Final 10/01/2013
Flathead Reservation (Lake County) Keller Transport, Inc. Groundwater Remediation Treatment Facility MT0030805 Individual Final 05/03/2018
Flathead Reservation (Lake County) St. Ignatius-Southside Wastewater Treatment Facility MT0029017 Individual Final 06/01/2010
Flathead Reservation (Lake County) Jocko River Trout Hatchery Wastewater Treatment Facility MT0030564 Individual Final 01/01/2017
Crow Indian Reservation (Big Horn County) Yellowtail Dam Wastewater Treatment Facility MT0022993 Individual Final 11/01/2016
Crow Indian Reservation (Big Horn County) Yellowtail Dam Visitor Center Wastewater Treatment Facility MT0029106 Individual Final 11/01/2016
Crow Indian Reservation (Big Horn County) Sunlight Ranch Company, Little Horn Unit MT0029424 Individual Final 09/01/2017
Blackfeet Reservation (Glacier County) City of Cut Bank Water Treatment Plant MT0030562 Individual Final 05/18/2017
Flathead Reservation (Lake County) City of Ronan Water Treatment Plant MT0030821 Individual Final 09/01/2012
Crow Indian Reservation (Big Horn County) Crow Nation Water Treatment Plants MT0030538 Individual Final 04/01/2014
Blackfeet Reservation (Glacier County) Glendale Colony, Inc. and Harvey Farms, Inc. MT0031819 Individual Final 04/01/2014
Crow Indian Reservation (Big Horn County) Crow Municipal Rural & Industrial (MR&I) Pilot Water Treatment Plant MT0031827 Individual Final 03/01/2015
Various Wastewater Lagoons in Indian Country MTG589### General Final 01/01/2016