EPA Air · stack tests by county and year
Air-emissions stack tests in Rosebud County, Montana, 2021
- 18Stack 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 2021. 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, 2021
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2021-11-18 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2021-11-18 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
| 2021-10-15 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-10-15 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-09-27 | WILLISTON BASIN - HATHAWAY STATION | Pass | State |
| 2021-06-11 | WILLISTON BASIN - HATHAWAY STATION | Pass | State |
| 2021-06-11 | WILLISTON BASIN - HATHAWAY STATION | Pass | State |
| 2021-05-27 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-05-27 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-03-19 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-03-19 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-03-18 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-03-18 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-03-05 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-03-05 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-01-29 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-01-29 | COLSTRIP STEAM ELECTRIC STATION | Pass | State |
| 2021-01-28 | COLSTRIP ENERGY LTD PARTNERSHIP | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.