EPA Air · stack tests by county and year
Air-emissions stack tests in Elk County, Pennsylvania, 2025
- 17Stack 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 Elk 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 Elk County facility page.
Elk County, Pennsylvania, 2025
- Inspections 44
Air-emissions stack tests in Elk County, other years
Air-emissions stack tests recorded in Elk County, Pennsylvania, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-12-11 | EASTERN GAS TRANS & STORAGE INC/ARDELL COMP STA/ELK | Pass | State |
| 2025-11-05 | GRAFTECH USA LLC/ST MARYS | Pass | State |
| 2025-10-07 | DOMTAR PAPER CO/JOHNSONBURG MILL — high-priority violation on file | Pass | State |
| 2025-10-01 | MERSEN USA/ST MARYS | Pass | State |
| 2025-09-30 | MERSEN USA/ST MARYS | Pass | State |
| 2025-08-07 | MERSEN USA/ST MARYS | Pass | State |
| 2025-08-05 | EASTERN GAS TRANS & STORAGE INC/ARDELL COMP STA/ELK | Pass | State |
| 2025-07-21 | DOMTAR PAPER CO/JOHNSONBURG MILL — high-priority violation on file | Pass | State |
| 2025-07-21 | DOMTAR PAPER CO/JOHNSONBURG MILL — high-priority violation on file | Pass | State |
| 2025-07-07 | LONGHORN PAD C/ELK | Pass | State |
| 2025-05-13 | KC MIDSTREAM SOLUTIONS LLC/OVERBEK STA | Pass | State |
| 2025-04-09 | NFG MIDSTREAM CLERMONT LLC/CLERMONT WEST COMP STA | Pass | State |
| 2025-03-11 | SENECA RESOURCES CO LLC/BOONE MOUNTAIN COMP STA | Pass | State |
| 2025-02-27 | SGL CARBON CORP/ST MARYS PLT | Pass | State |
| 2025-02-26 | SGL CARBON CORP/ST MARYS PLT | Pass | State |
| 2025-02-25 | SGL CARBON CORP/ST MARYS PLT | Pass | State |
| 2025-02-24 | SGL CARBON CORP/ST MARYS PLT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.