EPA Air · stack tests by state and year
Air-emissions stack tests in Montana, 2021
- 220Stack 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 2021; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Montana, 2021
- Yellowstone County 67
- Glacier County 20
- Rosebud County 18
- Fallon County 12
- Cascade County 11
- Jefferson County 9
- Silver Bow County 9
- Flathead County 8
- Big Horn County 8
- Phillips County 8
- Gallatin County 7
- Blaine County 6
- Lewis and Clark County 6
- Deer Lodge County 6
- Richland County 6
- Valley County 5
- Stillwater County 4
- Dawson County 3
Montana, other years
Air-emissions stack tests recorded in Montana, 2021
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2021-12-30 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2021-12-22 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2021-12-21 | MDU - GLENDIVE | GLENDIVE, Dawson, MT | Pass | State |
| 2021-12-21 | MDU - GLENDIVE | GLENDIVE, Dawson, MT | Pass | State |
| 2021-12-09 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2021-12-09 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2021-12-07 | DRY CREEK FIELD STATION 056 | RED LODGE, Carbon, MT | Pass | State |
| 2021-12-07 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2021-11-22 | MONTANA SULPHUR & CHEMICAL | BILLINGS, Yellowstone, MT | Pass | State |
| 2021-11-22 | MONTANA SULPHUR & CHEMICAL | BILLINGS, Yellowstone, MT | Pass | State |
| 2021-11-18 | ALLIED WASTE SYSTEMS | MISSOULA, Missoula, MT | Pass | State |
| 2021-11-18 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | Pass | State |
| 2021-11-18 | COLSTRIP ENERGY LTD PARTNERSHIP | COLSTRIP, Rosebud, MT | Pass | State |
| 2021-11-16 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2021-11-16 | WILLISTON BASIN - SACO | SACO, Phillips, MT | Pass | State |
| 2021-11-16 | WILLISTON BASIN - SACO | SACO, Phillips, MT | Pass | State |
| 2021-11-16 | WILLISTON BASIN - SACO | SACO, Phillips, MT | Pass | State |
| 2021-11-16 | WILLISTON BASIN - SACO | SACO, Phillips, MT | Pass | State |
| 2021-11-08 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2021-11-08 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2021-11-08 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2021-11-08 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2021-11-08 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2021-11-08 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2021-11-08 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2021-11-08 | ASH GROVE CEMENT | CLANCY, Jefferson, MT | Pass | State |
| 2021-10-28 | STILLWATER MINING CO SMELTER | COLUMBUS, Stillwater, MT | Pass | State |
| 2021-10-28 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2021-10-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2021-10-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2021-10-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2021-10-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2021-10-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2021-10-26 | NORTHWESTERN ENERGY MAINLINE #1 | CUT BANK, Glacier, MT | Pass | State |
| 2021-10-25 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2021-10-22 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2021-10-15 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2021-10-15 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2021-10-14 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-10-14 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-10-08 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2021-10-08 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2021-10-08 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2021-10-05 | N. BORDER PIPELINE CO STA. 3 | CULBERTSON, Roosevelt, MT | Pass | State |
| 2021-10-01 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2021-10-01 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2021-10-01 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2021-10-01 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2021-10-01 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2021-10-01 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2021-09-27 | WILLISTON BASIN - HATHAWAY STATION | HATHAWAY, Rosebud, MT | Pass | State |
| 2021-09-27 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2021-09-27 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2021-09-20 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2021-09-20 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2021-09-13 | STILLWATER MINE | NYE, Stillwater, MT | Pass | State |
| 2021-09-13 | STILLWATER MINE | NYE, Stillwater, MT | Pass | State |
| 2021-09-09 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2021-08-27 | AUGUSTA MAIN LINE #3 (STA 051) | AUGUSTA, Lewis and Clark, MT | Pass | State |
| 2021-08-27 | AUGUSTA MAIN LINE #3 (STA 051) | AUGUSTA, Lewis and Clark, MT | Pass | State |
| 2021-08-23 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2021-08-23 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2021-08-19 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-18 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-16 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-16 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-16 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-16 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-16 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-14 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2021-08-04 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-08-04 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-29 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2021-07-29 | WEYERHAEUSER-CFALLS — high-priority violation on file | COLUMBIA FALLS, Flathead, MT | Pass | State |
| 2021-07-22 | ROCKY MOUNTAIN POWER | HARDIN, Big Horn, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-22 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-19 | DRY CREEK FIELD STATION 056 | RED LODGE, Carbon, MT | Pass | State |
| 2021-07-12 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2021-07-12 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2021-07-12 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2021-07-09 | PAR MONTANA BULK TERMINAL | BILLINGS, Yellowstone, MT | Pass | State |
| 2021-07-07 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2021-07-07 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2021-07-07 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2021-07-07 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2021-07-07 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-07 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2021-07-07 | CHS INC REFINERY LAUREL | 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.