EPA Air · stack tests by county and year
Air-emissions stack tests in Roosevelt County, Montana, 2025
- 6Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in Roosevelt County, Montana during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the Roosevelt County facility page.
Air-emissions stack tests in Roosevelt County, other years
Air-emissions stack tests recorded in Roosevelt County, Montana, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-08-20 | N. BORDER PIPELINE CO STA. 3 | Pass | State |
| 2025-08-20 | N. BORDER PIPELINE CO STA. 3 | Pass | State |
| 2025-07-23 | BASIN ELECTRIC POWER COOPERATIVE | Pass | State |
| 2025-07-23 | BASIN ELECTRIC POWER COOPERATIVE | Pass | State |
| 2025-04-28 | BASIN ELECTRIC POWER COOPERATIVE | Pass | State |
| 2025-04-28 | BASIN ELECTRIC POWER COOPERATIVE | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.