EPA Air · stack tests by state and year
Air-emissions stack tests in Pennsylvania, 2025
- 951Stack 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 Pennsylvania 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 Pennsylvania, 2025
- Susquehanna County 159
- Bradford County 63
- Washington County 59
- Lycoming County 51
- Greene County 47
- Tioga County 45
- Philadelphia County 41
- Butler County 30
- Westmoreland County 27
- Lancaster County 23
- Berks County 22
- Wyoming County 22
- Bucks County 21
- York County 19
- Mercer County 18
- Allegheny County 17
- Armstrong County 17
- Elk County 17
- Northampton County 15
- Montgomery County 15
- Delaware County 14
- Schuylkill County 13
- Luzerne County 12
- Potter County 11
- Clinton County 11
- Beaver County 10
- Fayette County 10
- Dauphin County 10
- Indiana County 9
- McKean County 9
- Centre County 9
- Chester County 8
- Cambria County 8
- Bedford County 8
- Venango County 7
- Jefferson County 6
- Columbia County 6
- Sullivan County 5
- Warren County 5
- Franklin County 5
- Clarion County 5
- Clearfield County 4
- Lawrence County 4
- Juniata County 3
- Montour County 3
- Carbon County 3
- Lehigh County 3
Pennsylvania, other years
Air-emissions stack tests recorded in Pennsylvania, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-01-28 | VICINITY ENERGY EDISON/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-01-27 | DIVERSIFIED PROD LLC/PINE CREEK COMP STA | PINE CREEK TOWNSHIP, Jefferson, PA | Pass | State |
| 2025-01-27 | LOAN ASSET ISSUER LLC/WEST FINLEY 4 WELL PAD | WEST FINELY, Washington, PA | Pass | State |
| 2025-01-25 | CLARION BOARDS/CLARION PLT | SHIPPENVILLE, Clarion, PA | Pass | State |
| 2025-01-24 | ELLWOOD CRANKSHAFT & MACH CO/SHARON | SHARON, Mercer, PA | Pass | State |
| 2025-01-23 | TRANSCONTINENTAL GAS/FRAZER STA 200 | MALVERN, Chester, PA | Pass | State |
| 2025-01-23 | APPALACHIA MIDSTREAM SVC LLC/GRANVILLE STA 2 | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2025-01-23 | REGENCY MARCELLUS GAS GATHERING LLC/LONE WALNUT COMP STA | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-01-23 | ETC NORTHEAST PIPELINE LLC/RED BEND COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-01-22 | REGENCY MARCELLUS GATHERING LLC/BRADFORD WEST COMP STA | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2025-01-22 | WILLIAMS FIELD SVC CO LLC/CHURCH COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-01-21 | MORGAN ADV MAT & TECH/COUDERSPORT PLT | COUDERSPORT, Potter, PA | Pass | State |
| 2025-01-21 | VILLANOVA UNIV/MAIN CAMPUS | VILLANOVA, Delaware, PA | Pass | State |
| 2025-01-17 | TEXAS EASTERN TRANS LP/HOLBROOK STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-01-17 | ENSINGER INC/WASHINGTON | WASHINGTON, Washington, PA | Pass | State |
| 2025-01-16 | TEXAS EASTERN TRANS LP/ARMAGH STA | NEW FLORENCE, Indiana, PA | Pass | State |
| 2025-01-16 | APPALACHIA MIDSTREAM SVC LLC/AUBURN COMP STA | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-01-16 | SUSQUEHANNA GATHERING/CDP 1 COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-01-16 | OXBOW CREEK ENERGY LLC/ FACTORYVILLE | FACTORYVILLE, Wyoming, PA | Pass | State |
| 2025-01-15 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2025-01-15 | APPALACHIA MIDSTREAM SVC LLC/RATTLESNAKE HILL COMP STA | AUBURN TOWNSHIP, Susquehanna, PA | Pass | State |
| 2025-01-14 | EASTERN GAS TRANS & STORAGE/CRAYNE STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-01-14 | EXCO APPALACHIA MIDSTREAM LLC/POVERTY HILL COMP STA | KITTANNING, Armstrong, PA | Pass | State |
| 2025-01-14 | CHIEF OIL & GAS TAGUE WEST COMPRESSOR | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-01-13 | HEP PENNSYLVANIA GATHERING LLC/TIOGA CPF#2 COMP STA | LIBERTY, Tioga, PA | Pass | State |
| 2025-01-10 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2025-01-10 | BLUESTONE PIPELINE CO/COMFORT LAKE COMP STA | HARMONY TWP, Susquehanna, PA | Pass | State |
| 2025-01-10 | WILLIAMS FIELD SVC CO LLC/GIBSON COMP STA | SOUTH GIBSON, Susquehanna, PA | Pass | State |
| 2025-01-10 | EQM GATHERING OPCO LLC/BLUE MOON COMP STA | DAISYTOWN, Washington, PA | Pass | State |
| 2025-01-10 | USS CORP/EDGAR THOMSON WORKS — high-priority violation on file | BRADDOCK, Allegheny, PA | Pass | Local |
| 2025-01-09 | TRANSCONTINENTAL GAS/JACKSON TWP STA 517 | BENTON, Columbia, PA | Pass | State |
| 2025-01-09 | DONSCO INC/MT JOY | MOUNT JOY, Lancaster, PA | Pass | State |
| 2025-01-09 | NFG MIDSTREAM COVINGTON LLC/MATZ COMP STA | CHATHAM, Tioga, PA | Pass | State |
| 2025-01-09 | REGENCY MARCELLUS GAS GATHERING LLC/OGONTZ WEST COMP STA | CUMMINS TWP, Lycoming, PA | Pass | State |
| 2025-01-09 | COMPASS NATURAL GAS/QUAKER CNG TRUCK TERMINAL | MONTOURSVILLE, Lycoming, PA | Pending | State |
| 2025-01-09 | USS CORP/EDGAR THOMSON WORKS — high-priority violation on file | BRADDOCK, Allegheny, PA | Pass | Local |
| 2025-01-08 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2025-01-08 | EASTERN GAS TRANS & STORAGE INC/SOUTH OAKFORD STA | DELMONT, Westmoreland, PA | Pass | State |
| 2025-01-08 | NFG MIDSTREAM COVINGTON LLC/LAWTON COMP STA | WELLSBORO, Tioga, PA | Pass | State |
| 2025-01-08 | WILLIAMS FIELD SVC CO LLC/CENTRAL COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-01-08 | SWN PRODUCTION CO LLC/KING NORTH 3H | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-01-07 | NATL FUEL SUPPLY CORP/BUFFALO COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-01-07 | WILLIAMS FIELD SVC CO LLC/WHITE COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-01-07 | EXPAND OPERATING LLC/FOLTA BRA PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2025-01-07 | EXPAND OPERATING LLC/KATHRYN BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2025-01-06 | NATL FUEL GAS SUPPLY CORP/MERCER COMP STA | MERCER, Mercer, PA | Pass | State |
| 2025-01-06 | EXPAND OPERATING LLC/LIGHTCAP BRA PAD | FORKSVILLE, Bradford, PA | Pass | State |
| 2025-01-03 | TRANSCONTINENTAL GAS/BEAR CREEK STA 515 | BEAR CREEK, Luzerne, PA | Pass | State |
| 2025-01-03 | ADHESIVES RESEARCH INC/GLEN ROCK — high-priority violation on file | GLEN ROCK, York, PA | Pass | State |
| 2025-01-03 | CLARION BOARDS/CLARION PLT | SHIPPENVILLE, Clarion, PA | Pass | State |
| 2025-01-02 | CNX MIDSTREAM OPR CO LLC/HOPEWELL STATION | SYCAMORE, Greene, PA | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.