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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in Elk county, PA, for 2025. It lists 17 stack tests recorded in 2025.