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 |
|---|---|---|---|---|
| 2025-12-30 | CHIEF OIL & GAS TAGUE WEST COMPRESSOR | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-12-30 | EXPAND OPERATING LLC/FOLTA BRA PAD | LACEYVILLE, Bradford, PA | Pass | State |
| 2025-12-30 | EXPAND OPERATING LLC/KATHRYN BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2025-12-23 | PPP FUTURE DEV INC/WARREN | SUGAR GROVE, Warren, PA | Pass | State |
| 2025-12-23 | PRESS ENTERPRISE/BLOOMSBURG PLT | BLOOMSBURG, Columbia, PA | Pass | State |
| 2025-12-22 | XTO ENERGY HOMER CITY PP COMP STA/INDIANA — high-priority violation on file | HOMER CITY, Indiana, PA | Pass | State |
| 2025-12-19 | MCC MFG INC/LAFAYETTE HILL — high-priority violation on file | LAFAYETTE HILL, Montgomery, PA | Pass | State |
| 2025-12-19 | MTN GATHERING LLC/JEFFERSON COMP STA | BUTLER, Butler, PA | Pass | State |
| 2025-12-19 | HILCORP ENERGY CO/JEFFERSON MONTGOMERY STA | JEFFERSON TOWNSHIP, Mercer, PA | Pass | State |
| 2025-12-18 | NORTH AMERICAN HOGANAS INC/STONY CREEK PLT | HOLLSOPPLE, Somerset, PA | Pass | State |
| 2025-12-18 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2025-12-18 | DUNMORE INTERNATIONAL CORP/BRISTOL | BRISTOL, Bucks, PA | Pass | State |
| 2025-12-18 | PERDUE AGRIBUSINESS LLC/BAINBRIDGE — high-priority violation on file | MARIETTA, Lancaster, PA | Pass | State |
| 2025-12-18 | EXPAND OPERATING LLC/WR-64 FIONDI PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-12-17 | WASTE MGMT DSPL SVC /GROWS LDFL | MORRISVILLE, Bucks, PA | Pass | State |
| 2025-12-17 | LANCASTER CNTY SWMA/SUSQ RESOURCE MGMT COMPLEX — high-priority violation on file | HARRISBURG, Dauphin, PA | Pending | State |
| 2025-12-17 | ETC NORTHEAST PIPELINE/REVOLUTION CRYO PLT | BULGER, Washington, PA | Pass | State |
| 2025-12-17 | DERRY TWP MUNI AUTH/CLEARWATER RD | HERSHEY, Dauphin, PA | Pass | State |
| 2025-12-16 | EASTERN GAS TRANS & STORAGE/CRAYNE STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-12-16 | MTN GATHERING LLC/DRY RUN COMP STA | CHAPMAN, Clinton, PA | Pass | State |
| 2025-12-16 | PIN OAK MIDSTREAM LLC/JACKSON CTR COMP STA | JACKSON CENTER, Mercer, PA | Pass | State |
| 2025-12-16 | ELKHORN GAS PROC LLC/KANE PLT | KANE, McKean, PA | Pass | State |
| 2025-12-16 | REGENCY MARCELLUS GAS GATHERING LLC/ AUBURN STA | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-12-16 | PA TURNPIKE COMM/AKH MAINT FAC | JEANNETTE, Westmoreland, PA | Pass | State |
| 2025-12-12 | LUXFER MAGTECH SAXONBURG PLT | SAXONBURG, Butler, PA | Pass | State |
| 2025-12-12 | BLUESTONE PIPELINE CO/COMFORT LAKE COMP STA | HARMONY TWP, Susquehanna, PA | Pass | State |
| 2025-12-11 | CALUMET KARNS CITY REF LLC/KARNS CITY | KARNS CITY, Butler, PA | Pass | State |
| 2025-12-11 | EASTERN GAS TRANS & STORAGE INC/ARDELL COMP STA/ELK | WEEDVILLE, Elk, PA | Pass | State |
| 2025-12-11 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2025-12-11 | HATFIELD TWP MUNI AUTH/COLMAR | COLMAR, Montgomery, PA | Fail | State |
| 2025-12-10 | EXPAND OPERATING LLC/SCOTT WELLPAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-12-09 | CUMMINGS LUMBER CO INC/TROY TWP PLT | TROY, Bradford, PA | Pass | State |
| 2025-12-09 | CALPINE MID MERIT II LLC/ YORK ENERGY CENTER BLOCK 2 — high-priority violation on file | DELTA, York, PA | Pass | State |
| 2025-12-09 | EQM GATHERING OPCO LLC/PIPERS RIDGE INTERCONNECT | WAYNESBURG, Greene, PA | Pass | State |
| 2025-12-09 | PA GEN ENERGY CO LLC/TRACT 729 COMPRESSOR STATION | WATERVILLE, Lycoming, PA | Pass | State |
| 2025-12-08 | TEXAS EASTERN TRANS LP/ENTRIKEN STA | ENTRIKEN, Huntingdon, PA | Pass | State |
| 2025-12-08 | TEXAS EASTERN TRANS LP/ENTRIKEN STA | ENTRIKEN, Huntingdon, PA | Pass | State |
| 2025-12-04 | GREATER HAZLETON JT SEW AUTH/WEST HAZLETON STP — high-priority violation on file | WEST HAZLETON, Luzerne, PA | Fail | State |
| 2025-12-04 | RAUSCH CREEK GENERATION LLC/FRAILEY TWP — high-priority violation on file | TREMONT, Schuylkill, PA | Pass | State |
| 2025-12-03 | ENERGY DEVS MORGANTOWN LLC/CAERNARVON TWP | MORGANTOWN, Berks, PA | Pass | State |
| 2025-12-03 | EQUITRANS LP/JEFFERSON COMP STA | LIPPINCOTT, Greene, PA | Pass | State |
| 2025-12-03 | NFG MIDSTREAM COVINGTON LLC/KINNAN 845 WELL PAD | MIDDLEBURY, Tioga, PA | Pass | State |
| 2025-12-03 | NFG MIDSTREAM COVINGTON LLC/KEENEYVILLE COMP STA | MIDDLEBURY CTR, Tioga, PA | Pass | State |
| 2025-12-02 | TEXAS EASTERN TRANS LP/HOLBROOK STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-12-02 | NFG MIDSTREAM COVINGTON LLC/FULLER 826N WELL PAD | MIDDLEBURY, Tioga, PA | Pass | State |
| 2025-12-01 | TEXAS EASTERN TRANS LP/WAYNESBURG STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-12-01 | EXCO APPLACHIA MIDSTREAM LLC/CONFER COMP STA | BURNSIDE TWP, Centre, PA | Pass | State |
| 2025-12-01 | NFG MIDSTREAM COVINGTON LLC/BREON COMP STA | MANSFIELD, Tioga, PA | Pass | State |
| 2025-11-26 | ATI FLAT ROLLED PRODUCTS HOLDINGS LLC/VANDERGRIFT | VANDERGRIFT, Westmoreland, PA | Pass | State |
| 2025-11-26 | PA STATE UNIV/UNIV PARK CAMPUS | UNIVERSITY PARK, Centre, PA | Pass | State |
| 2025-11-25 | LINDY PAVING/WHEATLAND ASPHALT PLT | WHEATLAND, Mercer, PA | Pass | State |
| 2025-11-25 | ETC NORTHEAST PIPELINE LLC/BARTO COMP STA | HUGHESVILLE, Lycoming, PA | Pass | State |
| 2025-11-25 | NFG MIDSTREAM TROUT RUN LLC/TROUT RUN MTN COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-11-24 | ETC NORTHEAST PIPELINE LLC/RED BEND COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-11-24 | THE ESPOMA CO/FRAILEY TWP — high-priority violation on file | HEGINS, Schuylkill, PA | Pending | State |
| 2025-11-24 | EMPET, D. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-11-21 | YUASA BATTERY INC/LAURELDALE | LAURELDALE, Berks, PA | Pass | State |
| 2025-11-21 | REWORLD PLYMOUTH/ PLYMOUTH — high-priority violation on file | CONSHOHOCKEN, Montgomery, PA | Pass | State |
| 2025-11-21 | MAID RITE SPECIALITY FOODS INC/DUNMORE | DUNMORE, Lackawanna, PA | Pass | State |
| 2025-11-20 | MSA SAFETY PITTSBURGH MFG LLC/MURRYSVILLE PLT | MURRYSVILLE, Westmoreland, PA | Pass | State |
| 2025-11-20 | WALTER R EARLE ASPHALT PLT/MORRISVILLE — high-priority violation on file | MORRISVILLE, Bucks, PA | Pending | State |
| 2025-11-19 | BUCK CO LLC/QUARRYVILLE — high-priority violation on file | QUARRYVILLE, Lancaster, PA | Pass | State |
| 2025-11-19 | YORK GROUP INC/BLACK BRIDGE RD | YORK, York, PA | Pass | State |
| 2025-11-19 | SUNOCO MIDSTREAM LLC/DUPONT TERMINAL | PITTSTON, Luzerne, PA | Pass | State |
| 2025-11-19 | MCC INTL/MILLER CENT CAST INC/MCDONALD PLT — high-priority violation on file | MC DONALD, Washington, PA | Pass | State |
| 2025-11-19 | EASTERN GAS TRANS & STORAGE INC/CENTRE COMP STA | PLEASANT GAP, Centre, PA | Pass | State |
| 2025-11-19 | EXPAND OPERATING LLC/MASSO SUS PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-11-19 | EXPAND OPERATING LLC/RU-09 HUMBERT III PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-11-19 | EXPAND OPERATING LLC/RU-20 ROMAN PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-11-18 | EXPAND OPERATING LLC/MCENANEY BRA PAD | NEW ALBANY, Bradford, PA | Pass | State |
| 2025-11-18 | HILCORP ENERGY CO/NORTH BEAVER KEPHART PROD FAC | ENON VALLEY, Lawrence, PA | Pass | State |
| 2025-11-18 | KRIEBEL MINERALS INC/ARMBURST SONY COMPRESSOR | MT PLEASANT, Westmoreland, PA | Pass | State |
| 2025-11-18 | EXPAND OPERATING LLC/DEER PARK PAD COMP STA | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-11-17 | EQT ARTEMIS MIDSTREAM LLC/ROGERS COMP STA — high-priority violation on file | NEW KENSINGTON, Westmoreland, PA | Pass | State |
| 2025-11-14 | BNZ MATERIALS INC/ZELIENOPLE | ZELIENOPLE, Butler, PA | Pass | State |
| 2025-11-14 | BALL METAL BEVERAGE CONTAINER CORP/PITTSTON | PITTSTON, Luzerne, PA | Pass | State |
| 2025-11-14 | US MINT/PHILA | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-11-13 | EASTERN GAS TRANS & STORAGE/CHAMBERSBURG COMP STA | CHAMBERSBURG, Franklin, PA | Pass | State |
| 2025-11-13 | EXCO APPALACHIA MIDSTREAM LLC/SAWMILL COMP STA | KITTANNING, Armstrong, PA | Pass | State |
| 2025-11-13 | APPALACHIA MIDSTREAM SVC LLC/RED FOX CDP | FOX, Sullivan, PA | Pass | State |
| 2025-11-13 | STODDARD, T. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-11-13 | CRANE, J PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-11-13 | US MINT/PHILA | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-11-12 | PEOPLES NATURAL GAS CO LLC/ROARING RUN STA | APOLLO, Armstrong, PA | Pass | State |
| 2025-11-12 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2025-11-12 | LANCASTER CNTY SWMA/SUSQ RESOURCE MGMT COMPLEX — high-priority violation on file | HARRISBURG, Dauphin, PA | Pass | State |
| 2025-11-12 | JANSSEN RESEARCH & DEVELOPMENT LLC/LOWER GWYNEDD | SPRING HOUSE, Montgomery, PA | Pass | State |
| 2025-11-12 | COLUMBIA GAS TRANS CORP/WAYNESBURG COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-11-12 | LPR ENERGY LLC/HENRY CLAY MIDSTREAM FAC | MARKLEYSBURG, Fayette, PA | Pass | State |
| 2025-11-12 | WILLIAMS FIELD SVC CO LLC/CHURCH COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-11-12 | EQUITRANS LP/REDHOOK COMPRESSOR STATION | WAYNESBURG, Greene, PA | Pass | State |
| 2025-11-12 | PA GEN ENERGY CO LLC/REED RUN STILL PAD A COMP STA — high-priority violation on file | SMETHPORT, McKean, PA | Pass | State |
| 2025-11-11 | WATSONTOWN BRICK CO/WATSONTOWN PLT | WATSONTOWN, Northumberland, PA | Pass | State |
| 2025-11-11 | IRON MOUNTAIN INFORMATION MANAGEMENT LLC/BOYERS | BOYERS, Butler, PA | Pass | State |
| 2025-11-11 | REGENCY MARCELLUS GATHERING LLC/BRADFORD WEST COMP STA | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2025-11-11 | COLUMBIA GAS TRANS LLC/REDD FARM COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-11-11 | EXPAND OPERATING LLC/JOEGUSWA WELL PAD | DUSHORE, Sullivan, PA | Pass | State |
| 2025-11-11 | EXPAND OPERATING LLC/STONE BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2025-11-10 | REGENCY MARCELLUS GAS GATHERING LLC/OGONTZ EAST COMP STA | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-11-08 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Fail | Local |
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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, stack tests in state PA, 2025. It lists 951 stack tests recorded in 2025.