EPA Air · stack tests by county and year
Air-emissions stack tests in Pennington County, South Dakota, 2026
- 9Stack 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 Pennington County, South Dakota during 2026. 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 Pennington County facility page.
Pennington County, South Dakota, 2026
Air-emissions stack tests in Pennington County, other years
Air-emissions stack tests recorded in Pennington County, South Dakota, 2026
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2026-06-19 | GCC DACOTAH — high-priority violation on file | Pass | State |
| 2026-06-18 | GCC DACOTAH — high-priority violation on file | Pass | State |
| 2026-06-16 | GCC DACOTAH — high-priority violation on file | Pass | State |
| 2026-05-12 | PETE LIEN & SONS, INC. MAIN PLANT | Pass | State |
| 2026-05-06 | BLACK HILLS POWER, INC. (LANGE) | Pass | State |
| 2026-04-29 | PETE LIEN & SONS, INC. MAIN PLANT | Pass | State |
| 2026-04-28 | PETE LIEN & SONS, INC. MAIN PLANT | Pass | State |
| 2026-04-16 | PETE LIEN & SONS, INC. MAIN PLANT | Pass | State |
| 2026-02-17 | PETE LIEN & SONS, INC. MAIN PLANT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.