EPA Air · stack tests by state and year
Air-emissions stack tests in South Dakota, 2025
- 46Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Every stack test below was recorded against a source in South Dakota during 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in South Dakota, 2025
South Dakota, other years
Air-emissions stack tests recorded in South Dakota, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-04 | MITCHELL REGIONAL LANDFILL | MITCHELL, Davison, SD | Pass | State |
| 2025-12-02 | VALERO RENEWABLE FUELS COMPANY LLC — high-priority violation on file | AURORA, Brookings, SD | Pass | State |
| 2025-11-25 | REDFIELD ENERGY LLC — high-priority violation on file | REDFIELD, Beadle, SD | Pass | State |
| 2025-11-18 | NUGEN ENERGY LLC — high-priority violation on file | MARION, Turner, SD | Pass | State |
| 2025-11-12 | GLACIAL LAKES ENERGY LLC | WATERTOWN, Codington, SD | Pass | State |
| 2025-11-11 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2025-11-06 | HUB CITY ENERGY, LLC — high-priority violation on file | ABERDEEN, Brown, SD | Pass | State |
| 2025-11-06 | HUB CITY ENERGY, LLC — high-priority violation on file | ABERDEEN, Brown, SD | Pass | State |
| 2025-11-05 | ABERDEEN ENERGY, LLC — high-priority violation on file | MINA, Edmunds, SD | Pass | State |
| 2025-11-04 | HURON ENERGY LLC, DBA GLACIAL LAKES ENERGY LLC — high-priority violation on file | HURON, Beadle, SD | Pass | State |
| 2025-10-22 | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION - ABERDEEN | ABERDEEN, Brown, SD | Pass | State |
| 2025-10-21 | CITY OF RAPID CITY SOLID WASTE DIVISION | RAPID CITY, Pennington, SD | Pass | State |
| 2025-10-15 | POET BIOREFINING - GROTON | GROTON, Brown, SD | Pass | State |
| 2025-10-07 | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION - HURON | HURON, Beadle, SD | Pass | State |
| 2025-09-24 | SOLVENTUM US LLC — high-priority violation on file | BROOKINGS, Brookings, SD | Pass | State |
| 2025-09-16 | WHARF RESOURCES INC - COEUR WHARF | LEAD, Lawrence, SD | Pass | State |
| 2025-09-10 | BASIN ELECTRIC - DEER CREEK STATION | ELKTON, Brookings, SD | Pass | State |
| 2025-09-10 | BLACK HILLS POWER, INC. (LANGE) | RAPID CITY, Pennington, SD | Pass | State |
| 2025-09-09 | BASIN ELECTRIC POWER COOPERATIVE GROTON GENERATING | GROTON, Brown, SD | Pass | State |
| 2025-08-20 | POET BIOREFINING - GROTON | GROTON, Brown, SD | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY LLC — high-priority violation on file | AURORA, Brookings, SD | Pass | State |
| 2025-08-05 | POET BIOPROCESSING - CHANCELLOR, LLC — high-priority violation on file | CHANCELLOR, Turner, SD | Pass | State |
| 2025-07-31 | OTTER TAIL POWER COMPANY | BIG STONE CITY, Grant, SD | Pass | State |
| 2025-07-30 | OTTER TAIL POWER COMPANY | BIG STONE CITY, Grant, SD | Pass | State |
| 2025-07-29 | OTTER TAIL POWER COMPANY | BIG STONE CITY, Grant, SD | Pass | State |
| 2025-07-17 | HURON ENERGY LLC, DBA GLACIAL LAKES ENERGY LLC — high-priority violation on file | HURON, Beadle, SD | Fail | State |
| 2025-07-15 | ABERDEEN ENERGY, LLC — high-priority violation on file | MINA, Edmunds, SD | Pass | State |
| 2025-06-19 | OTTER TAIL POWER COMPANY - ASTORIA STATION | ASTORIA, Deuel, SD | Pass | State |
| 2025-06-19 | GCC DACOTAH — high-priority violation on file | RAPID CITY, Pennington, SD | Pass | State |
| 2025-06-17 | NORTHERN STATES POWER COMPANY | SIOUX FALLS, Minnehaha, SD | Pass | State |
| 2025-06-17 | BLACK HILLS POWER, INC. (LANGE) | RAPID CITY, Pennington, SD | Pass | State |
| 2025-06-17 | GCC DACOTAH — high-priority violation on file | RAPID CITY, Pennington, SD | Pass | State |
| 2025-06-17 | GCC DACOTAH — high-priority violation on file | RAPID CITY, Pennington, SD | Pass | State |
| 2025-05-30 | GCC DACOTAH — high-priority violation on file | RAPID CITY, Pennington, SD | Pass | State |
| 2025-05-14 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2025-05-13 | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION - HURON | HURON, Beadle, SD | Pass | State |
| 2025-05-13 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2025-05-07 | MIDWEST MANUFACTURING DBA DAKOTA PANEL | RAPID CITY, Pennington, SD | Pass | State |
| 2025-04-15 | RED RIVER ENERGY, LLC — high-priority violation on file | ROSHOLT, Roberts, SD | Pass | State |
| 2025-04-08 | PETE LIEN & SONS, INC. MAIN PLANT | RAPID CITY, Pennington, SD | Pass | State |
| 2025-03-26 | RING NECK ENERGY & FEED LLC — high-priority violation on file | ONIDA, Sully, SD | Pass | State |
| 2025-03-11 | AG PROCESSING INC. | ABERDEEN, Brown, SD | Pass | State |
| 2025-02-25 | NUGEN ENERGY LLC — high-priority violation on file | MARION, Turner, SD | Pass | State |
| 2025-02-05 | OTTER TAIL POWER COMPANY | BIG STONE CITY, Grant, SD | Pass | State |
| 2025-02-05 | BLACK HILLS POWER, INC. - BEN FRENCH | RAPID CITY, Pennington, SD | Pass | State |
| 2025-01-28 | SOUTH DAKOTA SOYBEAN PROCESSORS - VOLGA | VOLGA, Brookings, SD | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.