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Discharge permits in Montana

151 active individual NPDES permits with limits in EPA's file of Oct 22, 2026.

By industry

Sewage treatment plants (92)

Bigfork County Water and Sewer MT0020397 · major
Butte Silver Bow City and County MT0022012 · major
Blackfeet Tribe - Blackfeet Water Department MT0031835
City of Big Timber MT0020753
City of Billings MT0022586 · major
City of Boulder MT0023078
City of Bozeman MT0022608 · major
City of Chinook MT0020125
City of Choteau MT0020052
City of Colstrip MT0022373
City of Conrad MT0020079
City of Cut Bank MT0020141
City of Deer Lodge MT0022616 · major
City of Dillon MT0021458
City of East Helena MT0022560
City of Forsyth MT0021288
City of Fort Benton MT0021601
City of Glasgow MT0021211
City of Glendive MT0021628 · major
City of Great Falls MT0021920 · major
City of Hamilton MT0020028 · major
City of Harlowton MT0020354
City of Havre MT0022535 · major
City of Helena MT0022641 · major
City of Kalispell MT0021938 · major
City of Laurel MT0020311 · major
City of Lewistown MT0020044 · major
City of Libby MT0020494 · major
City of Livingston MT0020435 · major
City of Malta MT0020389
City of Manhattan MT0021857
City of Miles City MT0020001 · major
City of Missoula MT0022594 · major
City of Red Lodge MT0020478 · major
City of Roundup MT0030295
City of Shelby MT0031488
City of Sidney MT MT0021849
City of Superior MT0020664
City of Three Forks MT0020401
City of White Sulphur Springs MT0020699
City of Whitefish MT0020184 · major
City of Hardin Wastewater Treatment Facility MT0030759 · major
Gardiner and Park County Water and Sewer Dist MT0022705
Glacier National Park MT0030601
Highwood County Water and Sewer District MT0022080
Hinsdale Water and Sewer District MT0020656
Hot Springs, Town of MT0020591
John Collins MT0031658
Lake County-Charlo Water & Sewer Dis MT0022551
Lincoln County Port Authority Lcpa MT0000221
Missoula County Commissioners MT0020168
Northern Cheyenne Utilities Commission MT0029360
Peace Valley Hot Springs MT0023639
Polson- City of MT0020559
Poplar, Town of MT0030597
Ronan- City of - WWTF MT0021474
Stillwater County Commissioners MT0021750
Stockett Water and Sewer Dist MT0030091
Sun Prairie Village W and S Dist MT0028665
Sweetgrass Comm Co Water Sewer Dist MT0031437
Salish and Kootenai Housing Authority MT0029017
Symes Hot Springs Hotel and Mineral Bath MT0030619
Town of Alberton MT0021555
Town of Belt MT0021571
Town of Bridger MT0020303
Town of Chester MT0020338
Town of Columbus MT0031801
Town of Culbertson MT0031798
Town of Denton MT0022462
Town of Ekalaka MT0020371
Town of Ennis MT0030732
Town of Grass Range MT0030309
Town of Joliet MT0020249
Town of Jordan MT0021385
Town of Kevin MT0030244
Town of Philipsburg MT0031500
Town of Plains MT0030465
Town of Stevensville MT0022713
Town of Sunburst MT0021679
Town of Twin Bridges MT0028797
Town of Valier MT0021792
Town of Wibaux MT0020516
Town of Winifred MT0031453
Town of Lodge Grass MT0021890
Usbor-Yellowtail Dam Wastewater Treatment Facility MT0022993
University of Montana MT0023388
Vaughn Cascade County Water Sewer District MT0021440
Willow Creek Sewer District MT0025038
Wolf Creek County Water Sewer Dist MT0031712
Wolf Point, City of MT0030571
Westmoreland Rosebud Mining LLC MT0031828
Woodcock Home Addition MT0030554

Industrial and other (59)

Ash Grove Cement Company MT0000451 · Cement, Hydraulic
BNSF Railway Company MT0000019 · Railroads, Line-Haul Operating
BNSF Railway Company MT0000388 · Switching And Terminal Services
Butte Highlands JV LLC MT0031755 · major · Gold Ores
CCCS Inc MT0021431 · General Medical & Surgical Hospitals
CH SP Acquisition LLC MT0032174 · Water, Sewer, And Utility Lines
CHS Inc MT0000264 · major · Petroleum Refining
City of Bozeman MT0030155 · Water Supply
City of Bozeman MT0031631 · Water Supply
City of Chinook MT0030473 · Water Supply
City of Colstrip MT0030422 · Water Supply
City of Columbia Falls MT0020036 · Sanitary Services
City of Great Falls MT0000442 · Water Supply
City of Helena MT0028720 · Water Supply
City of Laurel MT0030261 · Water Supply
City of Libby MT0030341 · Water Supply
City of Whitefish MT0030414 · Water Supply
Colstrip Energy Limited Partnership MT0031780 · Electric Services
Decker Coal Company MT0000892 · major · Bituminous Coal And Lignite - Surface
Decker Coal Company MT0024210 · major · Bituminous Coal And Lignite - Surface
Eduro Health Care MT0023566 · Skilled Nursing Care Facilities
Elevation NewCo LLC MT0029891 · Miscellaneous Nonmetallic Minerals
GCC Three Forks LLC MT0000485 · Cement, Hydraulic
Jardine Land & Livestock LLC MT0030252 · Gold Ores
Jocko River Trout Hatchery MT0030546 · Fish Hatcheries And Preserves
Keller Transport, Inc. MT0030805 · Sanitary Services
Magris Talc USA Inc MT0028584 · Miscellaneous Nonmetallic Minerals
Montana Aviation Research Co MT0029980 · Aircraft
Montana Sulphur and Chemical Co MT0000230 · Industrial Inorganic Chemicals
Montanore Minerals Corp MT0030279 · Silver Ores
Montana DEQ MT0032247 · Water, Sewer, And Utility Lines
Navajo Transitional Energy Company LLC MT0024619 · Bituminous Coal And Lignite - Surface
Paleo Search Inc MT0025020 · major · Gold Ores
Phillips 66 Billings Refinery MT0000256 · major · Petroleum Refining
Par Montana, LLC. MT0000477 · major · Petroleum Refining
Par Montana, LLC. MT0028321 · Petroleum Refining
Rec Advanced Silicon Materials LLC MT0030350 · Primary Nonferrous Metals
Rsip LLC MT0030651 · Steam And Air-Conditioning Supply
Signal Peak Energy LLC MT0028983 · Bituminous Coal And Lignite - Surface
Soap Creek Associates, LLC MT0023183 · Crude Petroleum And Natural Gas
Stillwater Mining Company MT0024716 · Metal Ores
Stillwater Mining Company MT0026808 · Metal Ores
Ta Operating LLC MT0031879 · Miscellaneous Food Stores
TC Energy - Northern Border Pipeline Company MT0030791 · Natural Gas Transmission
Tintina Montana Inc MT0031909 · major · Copper Ores
US Army Corps of Engineers MT0031551 · General Government
US Bureau of Reclamation MT0022578 · Electric Services
Uscoe Libby Dam MT0022390 · Water, Sewer, And Utility Lines
Western Sugar Cooperative MT0000281 · major · Beet Sugar
Westmoreland Savage Corp MT0023604 · Bituminous Coal And Lignite - Surface
Wolf Mountain Coal Inc MT0031411 · Coal And Other Minerals And Ores
Westmoreland Absaloka Mining LLC MT0021229 · Bituminous Coal And Lignite - Surface
Westmoreland Mining LLC MT0030783 · Bituminous Coal And Lignite - Surface
Westmoreland Rosebud Mining LLC MT0023965 · major · Bituminous Coal And Lignite - Surface
Westmoreland Rosebud Mining LLC MT0032042 · Bituminous Coal And Lignite - Surface
Wild Horse Hot Springs, Inc MT0000005 · Hotels And Motels
Yellowstone Boys and Girls Ranch County Water Sewer District MT0020460 · Residential Care
Yellowstone Club LLC MT0032051 · Water, Sewer, And Utility Lines
Yellowstone Energy Limited Partnership MT0030180 · Electric Services

Source: EPA ECHO, Oct 22, 2026. As JSON: /api/v1/permits?state=MT · MCP: https://passage-data.com/mcp · All states