EPA Air · stack tests by county and year
Air-emissions stack tests in Mercer County, Pennsylvania, 2025
- 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 Mercer County, Pennsylvania 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 Mercer County facility page.
Mercer County, Pennsylvania, 2025
Air-emissions stack tests in Mercer County, other years
Air-emissions stack tests recorded in Mercer County, Pennsylvania, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-19 | HILCORP ENERGY CO/JEFFERSON MONTGOMERY STA | Pass | State |
| 2025-12-16 | PIN OAK MIDSTREAM LLC/JACKSON CTR COMP STA | Pass | State |
| 2025-11-25 | LINDY PAVING/WHEATLAND ASPHALT PLT | Pass | State |
| 2025-09-11 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | Pass | State |
| 2025-09-09 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | Pass | State |
| 2025-09-08 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | Pending | State |
| 2025-08-21 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | Pass | State |
| 2025-06-06 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | Pass | State |
| 2025-05-23 | CCL CONTAINER/ADVANCED MONOBLOC AEROSOL DIV — high-priority violation on file | Pass | State |
| 2025-04-09 | PIN OAK MIDSTREAM LLC/HURTT COMP STA | Fail | State |
| 2025-03-27 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | Fail | State |
| 2025-03-27 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | Pass | State |
| 2025-03-19 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | Pass | State |
| 2025-03-10 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | Fail | State |
| 2025-03-04 | TENNESSEE GAS PIPELINE CO LLC/MERCER STA 219 | Pass | State |
| 2025-03-04 | TENNESSEE GAS PIPELINE CO LLC/MERCER STA 219 | Pass | State |
| 2025-01-24 | ELLWOOD CRANKSHAFT & MACH CO/SHARON | Pass | State |
| 2025-01-06 | NATL FUEL GAS SUPPLY CORP/MERCER COMP STA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.