EPA Air · stack tests by state and year
Air-emissions stack tests in Montana, 2024
- 180Stack 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 2024; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Montana, 2024
- Yellowstone County 82
- Rosebud County 18
- Glacier County 14
- Deer Lodge County 12
- Silver Bow County 9
- Big Horn County 7
- Flathead County 7
- Fallon County 6
- Richland County 6
- Valley County 5
- Roosevelt County 4
- Jefferson County 4
Montana, other years
Air-emissions stack tests recorded in Montana, 2024
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2024-12-30 | DRY CREEK FIELD STATION 056 | RED LODGE, Carbon, MT | Pass | State |
| 2024-12-27 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2024-12-27 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2024-12-27 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2024-12-27 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2024-12-27 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2024-12-27 | DAVE GATES GENERATING STATION AT MILL CREEK | ANACONDA, Deer Lodge, MT | Pass | State |
| 2024-12-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-12-20 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | Pass | State |
| 2024-12-20 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | Pass | State |
| 2024-12-20 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | Pass | State |
| 2024-12-19 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2024-12-16 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-16 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-13 | MONTANA SULPHUR & CHEMICAL | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-11 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-02 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Fail | State |
| 2024-12-02 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-12-02 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Fail | State |
| 2024-11-19 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-11-07 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-07 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-06 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-06 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-06 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-11-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-11-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-11-04 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-10-25 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-10-24 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2024-10-24 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2024-10-24 | WILLISTON BASIN - HATHAWAY STATION | HATHAWAY, Rosebud, MT | Pass | State |
| 2024-10-24 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2024-10-24 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2024-10-18 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2024-10-18 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-16 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2024-10-03 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2024-10-03 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2024-09-23 | FLATHEAD ELECTRIC LFGE FACILITY | KALISPELL, Flathead, MT | Pass | State |
| 2024-09-23 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2024-09-18 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2024-09-06 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Fail | State |
| 2024-09-06 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Fail | State |
| 2024-09-05 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2024-09-05 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2024-09-05 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2024-09-03 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2024-08-27 | ROCKY MOUNTAIN LABORATORIES FACILITY | HAMILTON, Ravalli, MT | Pass | State |
| 2024-08-23 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2024-08-09 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2024-08-09 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-08 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2024-08-07 | BASIN ELECTRIC POWER COOPERATIVE | BAINVILLE, Roosevelt, MT | Pass | State |
| 2024-08-07 | BASIN ELECTRIC POWER COOPERATIVE | BAINVILLE, Roosevelt, MT | Pass | State |
| 2024-07-31 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-29 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-22 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2024-07-22 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2024-07-22 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2024-07-22 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2024-07-22 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
| 2024-07-22 | YELLOWSTONE COUNTY GENERATING STATION | LAUREL, Yellowstone, MT | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.