EPA Air · stack tests by county and year
Air-emissions stack tests in Brown County, South Dakota, 2025
- 7Stack 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 Brown County, South Dakota 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 Brown County facility page.
Brown County, South Dakota, 2025
Air-emissions stack tests in Brown County, other years
Air-emissions stack tests recorded in Brown County, South Dakota, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-06 | HUB CITY ENERGY, LLC — high-priority violation on file | Pass | State |
| 2025-11-06 | HUB CITY ENERGY, LLC — high-priority violation on file | Pass | State |
| 2025-10-22 | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION - ABERDEEN | Pass | State |
| 2025-10-15 | POET BIOREFINING - GROTON | Pass | State |
| 2025-09-09 | BASIN ELECTRIC POWER COOPERATIVE GROTON GENERATING | Pass | State |
| 2025-08-20 | POET BIOREFINING - GROTON | Pass | State |
| 2025-03-11 | AG PROCESSING INC. | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.