EPA Air · stack tests by county and year
Air-emissions stack tests in Williams County, North Dakota, 2025
- 14Stack 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 Williams County, North 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 Williams County facility page.
Williams County, North Dakota, 2025
Air-emissions stack tests in Williams County, other years
Air-emissions stack tests recorded in Williams County, North Dakota, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-11 | BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | Pass | State |
| 2025-10-23 | HILAND PARTNERS HOLDINGS LLC - STONY CREEK COMPRESSOR STATION | Pass | State |
| 2025-10-16 | HILAND PARTNERS HOLDINGS LLC - EPPING COMPRESSOR STATION | N/A | State |
| 2025-10-15 | HESS TIOGA GAS PLANT LLC - TIOGA GAS PLANT - AQ | Pass | State |
| 2025-10-14 | BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | Pass | State |
| 2025-09-09 | HILAND PARTNERS HOLDINGS LLC - 4RUNNER COMPRESSOR STATION | Pass | State |
| 2025-08-26 | HILAND PARTNERS HOLDINGS LLC - BETHEL COMPRESSOR STATION | Pass | State |
| 2025-07-22 | HILAND PARTNERS HOLDINGS LLC - STONY CREEK COMPRESSOR STATION | Pass | State |
| 2025-06-25 | BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | Pass | State |
| 2025-06-24 | BASIN ELECTRIC POWER COOPERATIVE - PIONEER GENERATION STATION - AQ | Pass | State |
| 2025-06-12 | HILAND PARTNERS HOLDINGS LLC - 4RUNNER COMPRESSOR STATION | Pass | State |
| 2025-06-03 | HILAND PARTNERS HOLDINGS LLC - EPPING COMPRESSOR STATION | Pass | State |
| 2025-04-16 | HESS TIOGA GAS PLANT LLC - TIOGA GAS PLANT - AQ | Pass | State |
| 2025-01-21 | HESS TIOGA GAS PLANT LLC - TIOGA GAS PLANT - AQ | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.