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 |
|---|---|---|---|---|
| 2025-08-27 | GATES FUNERAL HOME & CREMATORY LLC/GATES FUNERAL HOME — high-priority violation on file | UNIONTOWN, Fayette, PA | Pass | State |
| 2025-08-26 | MAGNESITA REFRACTORIES/YORK — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-08-26 | EASTERN GAS TRANS & STORAGE/PUNXSUTAWNEY | PUNXSUTAWNEY, Jefferson, PA | Pass | State |
| 2025-08-26 | NFG MIDSTREAM COVINGTON LLC/DCNR TRACT 595 | ARNOT, Tioga, PA | Pass | State |
| 2025-08-26 | XTO ENERGY INC/WINSLOW | REYNOLDSVILLE, Jefferson, PA | Fail | State |
| 2025-08-26 | EQM GATHERING OPCO LLC/STEELHEAD COMP STA | MARIANNA, Washington, PA | Pass | State |
| 2025-08-26 | ALTA PERFORMANCE MATERIALS US, LLC | PITTSBURGH, Allegheny, PA | Pass | Local |
| 2025-08-25 | LAUREL HILL PAD A 12635 | LIBERTY, Lycoming, PA | Pass | State |
| 2025-08-22 | EXPAND OPERATING LLC/MARCUCCI JONES PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2025-08-21 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | WHEATLAND, Mercer, PA | Pass | State |
| 2025-08-21 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2025-08-21 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2025-08-21 | READING TERM DE LLC/SINKING SPRING E & W TERM | SINKING SPRING, Berks, PA | Pass | State |
| 2025-08-21 | BLACKHILL ENERGY LLC/BRADFORD CNTY COMP STA | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2025-08-21 | BLACKHILL ENERGY LLC/BEARDSLEE COMP STA | TROY, Bradford, PA | Pass | State |
| 2025-08-21 | EXPAND OPERATING LLC/RU-75 SGL-A WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-08-21 | EXPAND OPERATING LLC/RU-75 SGL-A WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-08-20 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2025-08-20 | STECKMAN RIDGE LP/CLEARVILLE | CLEARVILLE, Bedford, PA | Pass | State |
| 2025-08-20 | APPALACHIA MIDSTREAM SVC LLC/GRANVILLE STA 2 | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2025-08-20 | EXPAND OPERATING LLC/RU-71 BLUE BECK WELLPAD | MILFORD, Susquehanna, PA | Pass | State |
| 2025-08-20 | BLACKHILL ENERGY LLC/YOUNG COMP STA — high-priority violation on file | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2025-08-20 | USS/CLAIRTON WORKS — high-priority violation on file | CLAIRTON, Allegheny, PA | Pass | Local |
| 2025-08-19 | READING TERM DE LLC/SINKING SPRING E & W TERM | SINKING SPRING, Berks, PA | Pass | State |
| 2025-08-19 | OLDCASTLE APG NORTHEAST INC / BRISTOL | BRISTOL, Bucks, PA | Pass | State |
| 2025-08-19 | HERSHEY CO/WWTP | HERSHEY, Dauphin, PA | Pass | State |
| 2025-08-19 | EXPAND OPERATING LLC/RU-46 DROPP WELLPAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-08-19 | EXPAND OPERATING LLC/RU-47 KARMAZIN PAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-08-19 | CNX MIDSTREAM OPR CO LLC/MOR-44 COMP STA | WEST FINLEY, Washington, PA | Pass | State |
| 2025-08-15 | DONSCO INC/WRIGHTSVILLE | WRIGHTSVILLE, York, PA | Pass | State |
| 2025-08-15 | SENECA RESOURCES CORP/PHC COMP STA | CLEARFIELD, Clearfield, PA | Pass | State |
| 2025-08-15 | COMMERCIAL ASPHALT SUPPLY/FENELTON | FENELTON, Butler, PA | Fail | State |
| 2025-08-15 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2025-08-14 | AMRIZE CEMENT INC/WHITEHALL PLT — high-priority violation on file | WHITEHALL, Lehigh, PA | Pass | State |
| 2025-08-14 | PANTHER CREEK POWER OPR LLC/NESQUEHONING | NESQUEHONING, Carbon, PA | Pass | State |
| 2025-08-14 | US DOD/RAVEN ROCK MTN COMPLEX | BLUE RIDGE SUMMIT, Adams, PA | Pass | State |
| 2025-08-14 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/LOWRY COMP STA | AVELLA, Washington, PA | Pass | State |
| 2025-08-14 | XTO ENERGY HOMER CITY PP COMP STA/INDIANA — high-priority violation on file | HOMER CITY, Indiana, PA | Fail | State |
| 2025-08-14 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-13 | ANDRITZ INC/MUNCY FOUNDRY | MUNCY, Lycoming, PA | Pass | State |
| 2025-08-13 | NEW CONGOL/TRAINER PLT — high-priority violation on file | TRAINER, Delaware, PA | Pass | State |
| 2025-08-13 | DALRYMPLE GRAVEL & CONTR/BRADFORD CNTY PLT | SAYRE, Bradford, PA | Pass | State |
| 2025-08-13 | BIMBO BAKERIES USA INC/WILLIAMSPORT PLT | WILLIAMSPORT, Lycoming, PA | Pass | State |
| 2025-08-13 | REGENCY MARCELLUS GAS GATHERING LLC/ AUBURN STA | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-08-13 | PAYNE, D. PAD 1 | NEW MILFORD, Susquehanna, PA | Pending | State |
| 2025-08-12 | EASTERN GAS TRANS & STORAGE INC/SABINSVILLE STA | WESTFIELD, Tioga, PA | Pass | State |
| 2025-08-12 | EASTERN GAS TRANS & STORAGE INC/OAKFORD COMPRESSOR STA | DELMONT, Westmoreland, PA | Pass | State |
| 2025-08-12 | BKV OPR LLC/PLUSHANSKI WELL PAD | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-08-12 | EXPAND OPERATING LLC/GU-VW MCMAHON WELL PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2025-08-12 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-12 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-11 | PEOPLES NATURAL GAS CO LLC/VALLEY STA | YATESBORO, Armstrong, PA | Pass | State |
| 2025-08-11 | CNX MIDSTREAM OPR CO LLC/NV-57 COMP STA | PROSPERITY, Washington, PA | Pass | State |
| 2025-08-11 | BKV OPR LLC/MIRABELLI PAD | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-08-11 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2025-08-08 | CABOT OIL & GAS CORP/MAKOSKY T PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-08-08 | GREENWOOD, R. PAD 2 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-08-08 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-07 | MERSEN USA/ST MARYS | SAINT MARYS, Elk, PA | Pass | State |
| 2025-08-07 | TEXAS EASTERN TRANS LP/BERNVILLE STA | BERNVILLE, Berks, PA | Pass | State |
| 2025-08-07 | WHEELABRATOR FALLS INC/FALLS TWP — high-priority violation on file | MORRISVILLE, Bucks, PA | Pass | State |
| 2025-08-07 | JOSEPH J BRUNNER INC/BRUNNER LANDFILL — high-priority violation on file | ZELIENOPLE, Beaver, PA | Pass | State |
| 2025-08-07 | MTN GATHERING LLC/JEFFERSON COMP STA | BUTLER, Butler, PA | Fail | State |
| 2025-08-07 | MTN GATHERING LLC/JEFFERSON COMP STA | BUTLER, Butler, PA | Pass | State |
| 2025-08-07 | SUSQUEHANNA GATHERING/NORTH RANGE CPF 1 COMP STA | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-08-07 | EXPAND OPER LLC/GU-N HEBDA VANDEMARK PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2025-08-07 | RIVERSIDE MATERIALS INC/ASPHALT PLT | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-06 | CONSOL PA COAL CO LLC/BAILEY PREP PLT — high-priority violation on file | WEST FINLEY, Greene, PA | Pass | State |
| 2025-08-06 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-05 | EASTERN GAS TRANS & STORAGE INC/ARDELL COMP STA/ELK | WEEDVILLE, Elk, PA | Pass | State |
| 2025-08-05 | SNYDER BROS INC/HOGBACK COMP STA | NEW BETHLEHEM, Armstrong, PA | Pass | State |
| 2025-08-05 | APPALACHIA MIDSTREAM SVC LLC/CHERRY COMP STA | DUSHORE, Sullivan, PA | Pass | State |
| 2025-08-05 | PERDUE AGRIBUSINESS LLC/BAINBRIDGE — high-priority violation on file | MARIETTA, Lancaster, PA | Pass | State |
| 2025-08-05 | WARRINER, S PAD 1 — high-priority violation on file | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-08-05 | MOGRIDGE, C. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-08-05 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-08-04 | CAREY, R. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-08-04 | TSOUROUS, A. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-08-01 | DART CONTAINER CORP/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2025-08-01 | DART CONTAINER CORP/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2025-08-01 | MTN GATHERING LLC/DRY RUN COMP STA | CHAPMAN, Clinton, PA | Pass | State |
| 2025-08-01 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-07-30 | BIMBO BAKERIES USA INC/SAYRE PLT | SAYRE, Bradford, PA | Pass | State |
| 2025-07-30 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2025-07-30 | MONTOUR LLC/MONTOUR SES | WASHINGTONVILLE, Montour, PA | Pass | State |
| 2025-07-30 | SWN PROD CO LLC/DEPUE COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-07-30 | NFG MIDSTREAM TROUT RUN LLC/HAGERMAN GAS & PROC METERING FAC | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-07-30 | EXPAND OPERATING LLC/NICKOLYN WELL PAD | AUBURN, Susquehanna, PA | Pass | State |
| 2025-07-30 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-07-30 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-07-29 | SHELL CHEM APPALACHIA/SHELL POLYMERS MONACA — high-priority violation on file | MONACA, Beaver, PA | Pass | State |
| 2025-07-29 | SOUTHWESTERN ENERGY CO/SCARLET OAK 1H | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-07-29 | RAG APPLE LLC PAD 1 — high-priority violation on file | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-07-29 | RUSSO, B. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-07-28 | WCAA MIDSTREAM LLC/WEITZ SOUTH 20 COMP STA | ADAMSBURG, Westmoreland, PA | Pass | State |
| 2025-07-28 | PREMIER WELL SITE — high-priority violation on file | WILLIAMSPORT, Lycoming, PA | Pass | State |
| 2025-07-28 | JHHC PAD 1 — high-priority violation on file | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-07-28 | PENNAY, G PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-07-24 | LAUREL MTN MIDSTREAM OPR LLC/HERMINIE COMP STA | WEST NEWTON, Westmoreland, PA | Pass | State |
| 2025-07-24 | ABINGTON RELDAN METALS LLC/FAIRLESS HILLS — high-priority violation on file | FAIRLESS HILLS, Bucks, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.