EPA Air · stack tests by county and year
Air-emissions stack tests in Rosebud County, Montana, 2023
- 24Stack 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 Rosebud County, Montana during 2023. 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 Rosebud County facility page.
Air-emissions stack tests in Rosebud County, other years
Air-emissions stack tests recorded in Rosebud County, Montana, 2023
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2023-12-26 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-12-26 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-12-21 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-12-15 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2023-12-15 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2023-12-15 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2023-12-15 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2023-10-31 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-10-31 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-10-18 | WILLISTON BASIN - HATHAWAY STATION | Pass | State |
| 2023-07-06 | WILLISTON BASIN - HATHAWAY STATION | Pass | State |
| 2023-05-03 | WILLISTON BASIN - HATHAWAY STATION | Pass | State |
| 2023-04-21 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-04-21 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-28 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-17 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-03-17 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-01-23 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2023-01-06 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2023-01-06 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.