EPA Air · stack tests by county and year
Air-emissions stack tests in Valley County, Montana, 2025
- 5Stack 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 Valley 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 Valley County facility page.
Air-emissions stack tests in Valley County, other years
Air-emissions stack tests recorded in Valley County, Montana, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-25 | WILLISTON BASIN - FORT PECK STATION | Pass | State |
| 2025-11-25 | WILLISTON BASIN - FORT PECK STATION | Pass | State |
| 2025-07-21 | WILLISTON BASIN - FORT PECK STATION | Pass | State |
| 2025-05-14 | WILLISTON BASIN - FORT PECK STATION | Pass | State |
| 2025-01-27 | WILLISTON BASIN - FORT PECK STATION | 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 and their stack tests in Valley county, MT, in 2025. It lists 5 stack tests recorded in 2025.