EPA Air · inspections by state and year
Air-emissions inspections in Montana, 2026
- 25Inspections
A compliance evaluation is the on-site or file review a state, local or federal air agency records against a permitted source. Every inspection below was recorded against a source in Montana during 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Montana, 2026
Montana, other years
Air-emissions inspections recorded in Montana, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-11 | MDU - MILES CITY | MILES CITY, Custer, MT | FCE On-Site | State |
| 2026-08-11 | MDU - GLENDIVE | GLENDIVE, Dawson, MT | FCE On-Site | State |
| 2026-08-11 | HEXION INC | MISSOULA, Missoula, MT | FCE On-Site | State |
| 2026-08-10 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | FCE On-Site | State |
| 2026-08-06 | BARRICK GOLDEN SUNLIGHT MINE | WHITEHALL, Jefferson, MT | FCE On-Site | State |
| 2026-07-30 | BILLINGS TRANSPORTATION OPERATIONS | BILLINGS, Yellowstone, MT | FCE On-Site | State |
| 2026-07-28 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | PCE Off-Site | State |
| 2026-07-27 | BUTTE HIGHLANDS PROJECT | BUTTE, Silver Bow, MT | FCE On-Site | State |
| 2026-07-24 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | FCE On-Site | State |
| 2026-07-16 | TREASURE STATE CONCRETE, INC. | MONTANA, Undetermined, MT | FCE On-Site | U.S. EPA |
| 2026-07-14 | GREAT FALLS TERMINAL | GREAT FALLS, Cascade, MT | FCE On-Site | State |
| 2026-06-10 | GIBSON BRANDS. INC - BOZEMAN DIVISION | BOZEMAN, Gallatin, MT | FCE On-Site | State |
| 2026-06-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | PCE On-Site | U.S. EPA |
| 2026-05-29 | MONTANA FIBERGLASS INC | LEWISTOWN, Fergus, MT | FCE On-Site | State |
| 2026-05-28 | MT WASTE SYSTEMS - HIGH PLAINS LANDFILL | GREAT FALLS, Cascade, MT | FCE On-Site | State |
| 2026-05-14 | CUT BANK FIELD STATION 025 | CUT BANK, Glacier, MT | FCE Off-Site | State |
| 2026-05-07 | LUBRIZOL LIFE SCIENCES, INC | VICTOR, Ravalli, MT | FCE On-Site | State |
| 2026-04-30 | MONTANA AIR NATIONAL GUARD | GREAT FALLS, Cascade, MT | FCE On-Site | State |
| 2026-04-24 | WILLISTON BASIN - LITTLE BEAVER | BAKER, Fallon, MT | FCE Off-Site | State |
| 2026-03-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | FCE Off-Site | State |
| 2026-03-23 | WILLISTON BASIN - HATHAWAY STATION | HATHAWAY, Rosebud, MT | FCE Off-Site | State |
| 2026-03-10 | SUN MOUNTAIN LUMBER | DEER LODGE, Powell, MT | FCE On-Site | State |
| 2026-03-09 | BILLINGS BAKERY | BILLINGS, Yellowstone, MT | FCE On-Site | State |
| 2026-03-05 | N. BORDER PIPELINE CO STA. 3 | CULBERTSON, Roosevelt, MT | FCE Off-Site | State |
| 2026-01-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | PCE Off-Site | U.S. EPA |
Dates as filed by the agency that recorded the inspection. Figures from EPA’s ICIS-AIR download.