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 |
|---|---|---|---|---|
| 2025-04-10 | WPX ENERGY APPALACHIA LLC/POWERS SITE | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-04-10 | CNX MIDSTREAM OPR CO LLC/BUCKLAND COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-04-10 | NEXTERA RENEWABLE FUELS LLC/WESTERN BERKS LDFL | BIRDSBORO, Berks, PA | Pass | State |
| 2025-04-09 | PIN OAK MIDSTREAM LLC/HURTT COMP STA | NEW WILMINGTON, Mercer, PA | Fail | State |
| 2025-04-09 | NFG MIDSTREAM CLERMONT LLC/CLERMONT WEST COMP STA | EMPORIUM, Elk, PA | Pass | State |
| 2025-04-08 | SOUTHWESTERN ENERGY CO/TNT LIMITED PARTNERSHIP WEST 6H | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-04-08 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2025-04-07 | CNX MIDSTREAM OPR CO LLC/MAMONT COMP STA | APOLLO, Westmoreland, PA | Pass | State |
| 2025-04-04 | WILLIAMS FIELD SVC CO LLC/FRASER COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-04-04 | ETC NORTHEAST FIELD SVC LLC/FREEDOM COMP STA | FREEDOM, Beaver, PA | Pass | State |
| 2025-04-03 | MERCK SHARP & DOHME LLC/WEST PT | WEST POINT, Montgomery, PA | Pass | State |
| 2025-04-03 | BOEING CO PHILA/RIDLEY PARK PA FAC — high-priority violation on file | RIDLEY TWP, Delaware, PA | Pass | State |
| 2025-04-03 | BOEING CO PHILA/RIDLEY PARK PA FAC — high-priority violation on file | RIDLEY TWP, Delaware, PA | Pass | State |
| 2025-04-03 | WILLIAMS FIELD SVC CO LLC/SHIELDS COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-04-03 | SYNAGRO [PHILADELPHIA RENEWABLE BIO-FUELS LLC] — high-priority violation on file | UNIVERSITY CITY (SUBDIVISION), Philadelphia, PA | Pass | Local |
| 2025-04-02 | MARKWEST LIBERTY MIDSTREAM/DRYER BOOSTER COMP STA | AVELLA, Washington, PA | Pass | State |
| 2025-04-02 | WILLIAMS FIELD SVC CO LLC/WILCOX COMP STA | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-04-02 | NFG MIDSTREAM CLERMONT LLC/RICH VALLEY COMP STA | EMPORIUM, Cameron, PA | Pass | State |
| 2025-04-02 | EQM GATHERING OPCO LLC/KRYPTONITE COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-04-02 | EQM GATHERING OPCO LLC/KRYPTONITE COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-04-02 | SYNAGRO [PHILADELPHIA RENEWABLE BIO-FUELS LLC] — high-priority violation on file | UNIVERSITY CITY (SUBDIVISION), Philadelphia, PA | Pass | Local |
| 2025-04-01 | GREATER HAZLETON JT SEW AUTH/WEST HAZLETON STP — high-priority violation on file | WEST HAZLETON, Luzerne, PA | Pending | State |
| 2025-04-01 | LAUREL MTN MIDSTREAM OPR LLC/DUNBAR COMP STA | DUNBAR, Fayette, PA | Pass | State |
| 2025-04-01 | WILLIAMS FIELD SVC CO LLC/TEEL COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-04-01 | MARKWEST LIBERTY MIDSTREAM/BRIGICH COMP STA | CANONSBURG, Washington, PA | Pass | State |
| 2025-04-01 | SHELL CHEM APPALACHIA/SHELL POLYMERS MONACA — high-priority violation on file | MONACA, Beaver, PA | Pass | State |
| 2025-04-01 | EQM GATHERING OPCO LLC/KRYPTONITE COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-04-01 | SYNAGRO [PHILADELPHIA RENEWABLE BIO-FUELS LLC] — high-priority violation on file | UNIVERSITY CITY (SUBDIVISION), Philadelphia, PA | Pass | Local |
| 2025-03-28 | MARKWEST LIBERTY MIDSTREAM/SMITH COMP STA | BURGETTSTOWN, Washington, PA | Pass | State |
| 2025-03-27 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | WHEATLAND, Mercer, PA | Fail | State |
| 2025-03-27 | WHEATLAND TUBE COUNCIL AVE PLT/WHEATLAND TUBE LLC — high-priority violation on file | WHEATLAND, Mercer, PA | Pass | State |
| 2025-03-27 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2025-03-27 | EPP RENEWABLE ENERGY/NORTHERN TIER LFGTE PLT | WEST BURLINGTON, Bradford, PA | Pass | State |
| 2025-03-27 | WILLIAMS FIELD SVC CO LLC/ZICK COMP STA | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-03-27 | JKLM ENERGY LLC/REESE HOLLOW 117 WELL PAD | COUDERSPORT, Potter, PA | Pass | State |
| 2025-03-27 | JKLM ENERGY LLC/REESE HOLLOW 117 WELL PAD | COUDERSPORT, Potter, PA | Pass | State |
| 2025-03-26 | NORTHAMPTON GEN CO/NORTHAMPTON | NORTHAMPTON, Northampton, PA | Pass | State |
| 2025-03-26 | ARMSTRONG CEMENT & SUPPLY/WINFIELD — high-priority violation on file | CABOT, Butler, PA | Pass | State |
| 2025-03-26 | M SIMON ZOOK CO DBA GOLDEN BARREL PROD/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2025-03-26 | LAUREL MTN MIDSTREAM OPR LLC/CANTARAL COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-03-26 | JKLM ENERGY LLC/SWEDEN VALLEY 101 PAD | COUDERSPORT, Potter, PA | Pass | State |
| 2025-03-26 | JKLM ENERGY/SWEDEN VALLEY 105 WELL PAD | COUDERSPORT, Potter, PA | Pass | State |
| 2025-03-25 | TENNESSEE GAS PIPELINE CO/313 COUDERSPORT | COUDERSPORT, Potter, PA | Pass | State |
| 2025-03-25 | EAST PENN MFG CO INC/SMELTER PLT | LYONS, Berks, PA | Pass | State |
| 2025-03-25 | GREATER LEBANON REFUSE AUTH/LDFL 100825 & 101544 | LEBANON, Lebanon, PA | Pass | State |
| 2025-03-25 | MARKWEST LIBERTY MIDSTREAM/BAKER COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-03-25 | APPALACHIA MIDSTREAM SVC LLC/WILMOT COMP STA | WYALUSING, Bradford, PA | Pass | State |
| 2025-03-25 | UGI STORAGE CO/PALMER COMP STA | LAWRENCEVILLE, Tioga, PA | Pass | State |
| 2025-03-25 | EQT PROD CO/MOJO COMPRESSOR UNIT | WASHINGTON, Washington, PA | Pass | State |
| 2025-03-25 | EXPAND OPERATING LLC/ALVAREZ BRA WELL PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2025-03-24 | REGENCY MARCELLUS GAS GATHERING LLC/TEEL COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-03-24 | APPALACHIA MIDSTREAM SVC LLC/CHERRY COMP STA | DUSHORE, Sullivan, PA | Pass | State |
| 2025-03-23 | CLEVELAND CLIFFS STEELTON LLC/STEELTON | STEELTON, Dauphin, PA | Pass | State |
| 2025-03-21 | PA STATE UNIV/UNIV PARK CAMPUS | UNIVERSITY PARK, Centre, PA | Pass | State |
| 2025-03-20 | DART CONTAINER CORP/E LAMPETER WHSE | LANCASTER, Lancaster, PA | Pass | State |
| 2025-03-20 | EXPAND OPERATING LLC/WR-63 KNOSKY WELL PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-03-20 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-03-19 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | FARRELL, Mercer, PA | Pass | State |
| 2025-03-19 | EASTERN GAS TRANS & STORAGE INC/BOOM STA | LAWRENCEVILLE, Tioga, PA | Pass | State |
| 2025-03-19 | LEHIGH WHITE CEMENT CO LLC/YORK | YORK, York, PA | Pass | State |
| 2025-03-19 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/FULTON BOOSTER STA — high-priority violation on file | HICKORY, Washington, PA | Pass | State |
| 2025-03-19 | NFG MIDSTREAM COVINGTON LLC/KRAUSE COMP STA | MAINESBURG, Tioga, PA | Pass | State |
| 2025-03-18 | NORTHAMPTON GEN CO/NORTHAMPTON | NORTHAMPTON, Northampton, PA | Pass | State |
| 2025-03-18 | EBENSBURG POWER CO/EBENSBURG COGENERATION PLT | EBENSBURG, Cambria, PA | Pass | State |
| 2025-03-18 | NEXTERA RENEWABLE FUELS LLC/CUMBERLAND CNTY LDFL | SHIPPENSBURG, Cumberland, PA | Pass | State |
| 2025-03-18 | LPR MIDSTREAM PARTNERS LLC/PMG ALLEN STA | ADDISON, Somerset, PA | Pass | State |
| 2025-03-18 | NFG MIDSTREAM TROUT RUN LLC/BODINE COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-03-17 | DIVERSIFIED PROD LLC/BELL POINT COMP STA | APOLLO, Westmoreland, PA | Pass | State |
| 2025-03-17 | DIVERSIFIED PROD LLC/BROOKVILLE SOUTH COMP STA | BROOKVILLE, Jefferson, PA | Pass | State |
| 2025-03-14 | RAUSCH CREEK GENERATION LLC/FRAILEY TWP — high-priority violation on file | TREMONT, Schuylkill, PA | Pass | State |
| 2025-03-14 | LONGWOOD GARDENS/KENNETT SQUARE | KENNETT SQUARE, Chester, PA | Pass | State |
| 2025-03-14 | REPSOL OIL & GAS LLC/COLE COMP STA | TROY, Bradford, PA | Pass | State |
| 2025-03-14 | EXPAND OPERATING LLC/SCOTT WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-03-13 | EQT ARO LLC/COP TRACT 685 COMP STA — high-priority violation on file | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-03-13 | REGENCY MARCELLUS GAS GATHERING LLC/TAYLOR COMP STA | CANTON, Bradford, PA | Pass | State |
| 2025-03-13 | SUSQUEHANNA GATHERING CO 1 LLC/CDP 2 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-03-13 | EXPAND OPERATING LLC/MARCUCCI JONES PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2025-03-13 | BOLLES COMPRESSOR STATION/JESSUP TWP | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-03-12 | REPSOL OIL & GAS USA LLC/WATKINS HILL RD | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2025-03-12 | EQT ARO LLC/TRACT 285 COMP STA | NORTH BEND, Clinton, PA | Pass | State |
| 2025-03-12 | REGENCY MARCELLUS GAS GATHERING LLC/QUAKER STATE RD COMP STA | MONTOURSVILLE, Lycoming, PA | Pass | State |
| 2025-03-11 | GILBERTON POWER CO/JOHN B RICH MEM POWER STA | FRACKVILLE, Schuylkill, PA | Pass | State |
| 2025-03-11 | SENECA RESOURCES CO LLC/BOONE MOUNTAIN COMP STA | BROOKVILLE, Elk, PA | Pass | State |
| 2025-03-10 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | FARRELL, Mercer, PA | Fail | State |
| 2025-03-10 | EASTERN GAS TRANS & STORAGE INC/SOUTH OAKFORD STA | DELMONT, Westmoreland, PA | Pass | State |
| 2025-03-10 | EQT ARO LLC/TRACT 289 COMP STA — high-priority violation on file | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-03-10 | EXPAND OPERATING LLC/LU-06 FLICKS RUN EAST WELL PAD | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-03-10 | GREYLOCK PROD LLC/WILDCAT WELL PAD | MT MORRIS, Greene, PA | Pass | State |
| 2025-03-06 | BRUNNER ISLAND LLC/BRUNNER ISLAND | YORK HAVEN, York, PA | Pass | State |
| 2025-03-06 | NEXTERA RENEWABLE FUELS LLC/FREY FARM CRESWELL LDFL | CONESTOGA, Lancaster, PA | Pass | State |
| 2025-03-06 | REPSOL OIL & GAS USA LLC/EDSELL COMP STA | LE RAYSVILLE, Bradford, PA | Pass | State |
| 2025-03-06 | EQT ARO LLC/VARGO COMP STA — high-priority violation on file | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-03-06 | EXPAND OPERATING LLC/BLYE WELL PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-03-06 | PHILA GAS WORKS/RICHMOND PLT — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-03-05 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2025-03-05 | TENNESSEE GAS PIPELINE/MARIENVILLE STA 307 | MARIENVILLE, Forest, PA | Pass | State |
| 2025-03-05 | TENNESSEE GAS PIPELINE/MARIENVILLE STA 307 | MARIENVILLE, Forest, PA | Pass | State |
| 2025-03-05 | LAUREL MTN MIDSTREAM OPR LLC/PRAH COMP STA | MCCLELLANDTOWN, Fayette, PA | Pass | State |
| 2025-03-05 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | EVANS CITY, Butler, PA | Pass | State |
| 2025-03-05 | EXPAND OPER LLC/TI-46-BLISS WELL PAD | LIBERTY, Tioga, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.