EPA Air · stack tests by county and year
Air-emissions stack tests in Fallon County, Montana, 2025
- 13Stack 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 Fallon 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 Fallon County facility page.
Air-emissions stack tests in Fallon County, other years
Air-emissions stack tests recorded in Fallon County, Montana, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-30 | WILLISTON BASIN - MONARCH STATION | Pass | State |
| 2025-12-30 | WILLISTON BASIN - MONARCH STATION | Pass | State |
| 2025-07-21 | WILLISTON BASIN - CABIN CREEK | Pass | State |
| 2025-04-28 | WILLISTON BASIN - LITTLE BEAVER | Pass | State |
| 2025-04-28 | WILLISTON BASIN - LITTLE BEAVER | Pass | State |
| 2025-04-09 | WILLISTON BASIN - CABIN CREEK | Pass | State |
| 2025-04-09 | WILLISTON BASIN - CABIN CREEK | Pass | State |
| 2025-04-09 | WILLISTON BASIN - CABIN CREEK | Pass | State |
| 2025-03-28 | WILLISTON BASIN - MONARCH STATION | Pass | State |
| 2025-01-07 | WILLISTON BASIN - LITTLE BEAVER | Pass | State |
| 2025-01-07 | WILLISTON BASIN - LITTLE BEAVER | Pass | State |
| 2025-01-07 | WILLISTON BASIN - CABIN CREEK | Pass | State |
| 2025-01-07 | WILLISTON BASIN - CABIN CREEK | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Fallon county, MT, in 2025. It lists 13 stack tests recorded in 2025.