EPA Air · stack tests by state and year
Air-emissions stack tests in Montana, 2023
- 177Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in Montana during 2023; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Montana, 2023
- Yellowstone County 51
- Rosebud County 24
- Cascade County 17
- Big Horn County 14
- Glacier County 11
- Silver Bow County 9
- Flathead County 8
- Fallon County 7
- Deer Lodge County 6
- Valley County 5
- Jefferson County 4
- Gallatin County 3
- Richland County 3
- Stillwater County 3
- Roosevelt County 3
Montana, other years
Air-emissions stack tests recorded in Montana, 2023
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2023-04-21 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-04-21 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-04-21 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-04-19 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-04-19 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-04-04 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2023-04-04 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2023-04-03 | BASIN ELECTRIC POWER COOPERATIVE | BAINVILLE, Roosevelt, MT | Pass | State |
| 2023-04-03 | BASIN ELECTRIC POWER COOPERATIVE | BAINVILLE, Roosevelt, MT | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-28 | TELSTAD FIELD STATION 033 | SHELBY, Toole, MT | Pass | State |
| 2023-03-28 | TELSTAD FIELD STATION 033 | SHELBY, Toole, MT | Pass | State |
| 2023-03-24 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2023-03-24 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2023-03-24 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2023-03-21 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-03-20 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-20 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-20 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-17 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-17 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-17 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-14 | BASIN CREEK POWER SERVICES | BUTTE, Silver Bow, MT | Pass | State |
| 2023-03-10 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-03-07 | MSU - CENTRAL HEATING PLANT | BOZEMAN, Gallatin, MT | Pass | State |
| 2023-02-21 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Fail | State |
| 2023-02-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-02-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-02-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-02-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-02-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-02-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-02-09 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-02-09 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-02-07 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-01-30 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2023-01-27 | MALMSTROM AFB | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-01-27 | MALMSTROM AFB | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-01-25 | MONTANA SULPHUR & CHEMICAL | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-01-23 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-01-23 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-01-19 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2023-01-19 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2023-01-16 | FLATHEAD ELECTRIC LFGE FACILITY | KALISPELL, Flathead, MT | Pass | State |
| 2023-01-13 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2023-01-12 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2023-01-12 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2023-01-12 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2023-01-12 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2023-01-12 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2023-01-12 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2023-01-09 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2023-01-09 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2023-01-09 | WILLISTON BASIN - LITTLE BEAVER | BAKER, Fallon, MT | Pass | State |
| 2023-01-09 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2023-01-09 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2023-01-09 | FLATHEAD ELECTRIC LFGE FACILITY | KALISPELL, Flathead, MT | Pass | State |
| 2023-01-06 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-01-06 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2023-01-05 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-01-05 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2023-01-05 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
PreviousPage 1Page 2 of 2
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.