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 |
|---|---|---|---|---|
| 2025-05-21 | SNYDER BROS INC/AMBROSE COMP STA | ADRIAN, Armstrong, PA | Pass | State |
| 2025-05-20 | LIGNETICS OF NEW ENGLAND/YOUNGSVILLE | YOUNGSVILLE, Warren, PA | Pass | State |
| 2025-05-20 | RW GATHERING LLC/ECKER BERGMAN RD COMP STA | DERRY TWP, Westmoreland, PA | Pass | State |
| 2025-05-20 | MARKWEST LIBERTY BLUESTONE LLC/BLUESTONE GAS PROC PLT | EVANS CITY, Butler, PA | Pass | State |
| 2025-05-20 | SNYDER BROS INC/MUSHROOM MINE COMP STA | WORTHINGTON, Armstrong, PA | Pass | State |
| 2025-05-20 | EXPAND OPERATING LLC/MARCUCCI JONES PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2025-05-19 | RW GATHERING LLC/MOSHANNON COMP STA | DRIFTING, Clearfield, PA | Pass | State |
| 2025-05-19 | KING, D. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-05-16 | YORK CNTY SOLID WASTE/YORK CNTY RESOURCE RECOVERY — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-05-15 | SNYDER BROS INC/FURNACE RUN COMP STA | ADRIAN, Armstrong, PA | Pass | State |
| 2025-05-15 | SNYDER BROS INC/ENSIGN COMPRESSOR STATION | FREEPORT, Armstrong, PA | Pass | State |
| 2025-05-14 | EAST PENN MFG CO INC/BATTERY ASSEMBLY | LYONS, Berks, PA | Pass | State |
| 2025-05-14 | YORK CNTY SOLID WASTE/YORK CNTY RESOURCE RECOVERY — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-05-14 | TENNESSEE GAS PIPELINE/COMP STA 303 | JAMESTOWN, Venango, PA | Pass | State |
| 2025-05-14 | GREYLOCK MIDSTREAM LLC/KUHL-SKIB COMP STA | JEFFERSON, Greene, PA | Pass | State |
| 2025-05-14 | WILLIAMS FIELD SVC CO/POTTER COMP STA | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-05-13 | CRESTWOOD MEMBRANES INC/WRIGHT TWP | MOUNTAINTOP, Luzerne, PA | Pass | State |
| 2025-05-13 | EQUITRANS LP/JEFFERSON COMP STA | LIPPINCOTT, Greene, PA | Pass | State |
| 2025-05-13 | KC MIDSTREAM SOLUTIONS LLC/OVERBEK STA | RIDGWAY, Elk, PA | Pass | State |
| 2025-05-13 | GREYLOCK PRODUCTION LLC/BEACON WELL PAD | WAYNESBURG, Greene, PA | Pass | State |
| 2025-05-13 | ALLEGHENY LUDLUM LLC/BRACKENRIDGE | BRACKENRIDGE, Allegheny, PA | Pass | Local |
| 2025-05-12 | NATL FUEL GAS SUPPLY/ELLISBURG STA | ELLISBURG, Potter, PA | Pass | State |
| 2025-05-12 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/REDD COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-05-12 | EXPAND OPERATING LLC/NR-23 FOUR BUCKS PAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-05-09 | TEXAS EASTERN TRANS LP/BEDFORD STA | BEDFORD, Bedford, PA | Pass | State |
| 2025-05-08 | DUPONT TERMINALS DE LLC/PITTSTON | PITTSTON, Luzerne, PA | Pass | State |
| 2025-05-08 | PIXELLE SPEC SOLUTIONS LLC/SPRING GROVE — high-priority violation on file | SPRING GROVE, York, PA | Pass | State |
| 2025-05-08 | TENNESSEE GAS PIPELINE CO LLC/COMP STA 321 | CLIFFORD, Susquehanna, PA | Pass | State |
| 2025-05-08 | SENECA LANDFILL INC/SENECA | EVANS CITY, Butler, PA | Pass | State |
| 2025-05-08 | WILLIAMS FIELD SVC CO LLC/MILLER COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-05-08 | SHELL CHEM APPALACHIA/SHELL POLYMERS MONACA — high-priority violation on file | MONACA, Beaver, PA | Pass | State |
| 2025-05-08 | SOUTHEASTERN PENNSYLVANIA TRANSPORTATION — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-05-08 | SOUTHEASTERN PENNSYLVANIA TRANSPORTATION — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-05-07 | EQUITRANS LP/TRUITTSBURG STA | FAIRMOUNT CITY, Clarion, PA | Pass | State |
| 2025-05-07 | PERDUE AGRIBUSINESS LLC/BAINBRIDGE — high-priority violation on file | MARIETTA, Lancaster, PA | Pass | State |
| 2025-05-07 | EQM GATHERING OPCO LLC/MAKO COMP STA | AMWELL, Washington, PA | Pass | State |
| 2025-05-07 | ALPEK POLYESTER USA LLC/READING | READING, Berks, PA | Pass | State |
| 2025-05-07 | EXPAND OPERATING LLC/ RU-13 TONYA EAST PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-05-06 | PA GEN ENERGY CO LLC/FISK HOLLOW PAD A | ROULETTE, Potter, PA | Pass | State |
| 2025-05-06 | PA GEN ENERGY CO LLC/FISK HOLLOW PAD A | ROULETTE, Potter, PA | Pass | State |
| 2025-05-06 | WILLIAMS FIELD SVC CO LLC/HAWLEY COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-05-06 | EXPAND OPERATING LLC/GU-VW MCMAHON WELL PAD | STEVENSVILLE, Bradford, PA | Pass | State |
| 2025-05-05 | O-I GLASS INC/OWENS BROCKWAY GLASS CONTAINER PLT 19 | BROCKPORT, Jefferson, PA | Pass | State |
| 2025-05-05 | HILCORP ENERGY CO/PULASKI WHITING CTL FAC — high-priority violation on file | EDINBURG, Lawrence, PA | Fail | State |
| 2025-05-02 | DUPONT EAST TERM/PITTSTON | PITTSTON, Luzerne, PA | Pass | State |
| 2025-05-02 | EXPAND OPERATING LLC/CAPPUCCI WELL PAD | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-05-01 | STOELZLE GLASS USA INC/MONACA PLT | MONACA, Beaver, PA | Pass | State |
| 2025-05-01 | TENARIS KOPPEL TUBULARS LLC/KOPPEL PLT | KOPPEL, Beaver, PA | Pass | State |
| 2025-05-01 | COLUMBIA GAS TRANS CORP/GETTYSBURG COMP STA | GETTYSBURG, Adams, PA | Pass | State |
| 2025-05-01 | EASTERN GAS TRANS & STORAGE/RURAL VLY COMP STA | KITTANNING, Armstrong, PA | Pass | State |
| 2025-04-30 | PA STATE UNIV/UNIV PARK CAMPUS | UNIVERSITY PARK, Centre, PA | Pending | State |
| 2025-04-30 | PA STATE UNIV/UNIV PARK CAMPUS | UNIVERSITY PARK, Centre, PA | Pending | State |
| 2025-04-30 | AMERIKOHL AGGREGATES WELSH MINE | ELLWOOD CITY, Lawrence, PA | Pass | State |
| 2025-04-30 | COTERRA ENERGY INC/MEAD B PAD 1 — high-priority violation on file | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-04-30 | COTERRA ENERGY INC/BURKE G PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-04-30 | EARTHCARE LLC/BETHEL | BETHEL, Berks, PA | Pass | State |
| 2025-04-30 | FAIRLESS RNG — high-priority violation on file | MORRISVILLE, Bucks, PA | Fail | State |
| 2025-04-30 | WILLIAMS, D. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-04-29 | MARKWEST LIBERTY MIDSTREAM/ CARPENTER COMP STA | WEST ALEXANDRIA, Washington, PA | Pass | State |
| 2025-04-29 | EXPAND OPERATING LLC/TIFFANY WYO PAD | LACEYVILLE, Wyoming, PA | Pass | State |
| 2025-04-29 | COTERRA ENERGY INC/CARPENETTI R PAD 1 | NICHOLSON, Susquehanna, PA | Pass | State |
| 2025-04-29 | COTERRA ENERGY INC/MYERS R PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-04-29 | HOWELL, G. PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-04-29 | BUSIK, J. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-04-29 | DOBROSIELSKI, S PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-04-28 | EMPIRE PIPELINE INC/JACKSON COMP STA | LAWRENCEVILLE, Tioga, PA | Pass | State |
| 2025-04-28 | ABBOTT, M. PAD 1 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-04-25 | HYDRO EXTRUSION USA, LLC/CRESSONA | CRESSONA, Schuylkill, PA | Pass | State |
| 2025-04-24 | PIXELLE SPEC SOLUTIONS LLC/SPRING GROVE — high-priority violation on file | SPRING GROVE, York, PA | Pass | State |
| 2025-04-24 | ESAB WELDING & CUTTING PROD/HANOVER | HANOVER, York, PA | Pass | State |
| 2025-04-24 | WILLIAMS FIELD SVC CO LLC/ZICK COMP STA | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-04-23 | SCRUBGRASS GENERATING PLT/VENANGO — high-priority violation on file | KENNERDELL, Venango, PA | Pass | State |
| 2025-04-23 | PA STATE UNIV/UNIV PARK CAMPUS | UNIVERSITY PARK, Centre, PA | Pass | State |
| 2025-04-23 | LAUREL MTN MIDSTREAM OPR LLC/BROWN COMP STA | GREENSBORO, Greene, PA | Pass | State |
| 2025-04-23 | EQM GATHERING OPCO LLC/TWILIGHT COMP STA | DAISYTOWN, Washington, PA | Pass | State |
| 2025-04-23 | WILLIAMS FIELD SVC CO LLC/CENTRAL COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-04-23 | WILLIAMS FIELD SVC CO LLC/CENTRAL COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-04-23 | COMPASS NATURAL GAS/QUAKER CNG TRUCK TERMINAL | MONTOURSVILLE, Lycoming, PA | Pass | State |
| 2025-04-23 | MAGNUS PRODUCTS, LLC AT US STEEL - EDGAR THOMSON — high-priority violation on file | BRADDOCK, Allegheny, PA | Fail | Local |
| 2025-04-22 | P&G 2 WELL SITE | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-04-21 | PIXELLE SPEC SOLUTIONS LLC/SPRING GROVE — high-priority violation on file | SPRING GROVE, York, PA | Pass | State |
| 2025-04-21 | EQM GATHERING OPCO LLC/CALLISTO COMP STA | SYCAMORE, Greene, PA | Pass | State |
| 2025-04-21 | EXPAND OPER LLC/ROLAND BRA PAD | WILMONT, Bradford, PA | Pass | State |
| 2025-04-17 | ARMSTRONG WORLD IND /CORP CAMPUS | LANCASTER, Lancaster, PA | Pass | State |
| 2025-04-17 | WB COMM LDFL & RCYL CTR/WESTERN BERKS LDFL | BIRDSBORO, Berks, PA | Pass | State |
| 2025-04-17 | WILLIAMS FIELD SVC CO LLC/NORTHEAST COMP STA | HALLSTEAD, Susquehanna, PA | Pass | State |
| 2025-04-16 | EASTERN GAS TRANS & STORAGE INC/TIOGA STA | LAWRENCEVILLE, Tioga, PA | Pass | State |
| 2025-04-16 | WASTE MGMT PA/TULLYTOWN RES REC FAC | TULLYTOWN, Bucks, PA | Pass | State |
| 2025-04-16 | ETC NORTHEAST PIPELINE LLC/BARTO COMP STA | HUGHESVILLE, Lycoming, PA | Pass | State |
| 2025-04-16 | NFG MIDSTREAM COVINGTON LLC/STOCK 144 COMP STA | WELLSBORO, Tioga, PA | Pending | State |
| 2025-04-16 | EXPAND OPERATING LLC/CURTIN WYO PAD | LACEYVILLE, Wyoming, PA | Pass | State |
| 2025-04-15 | ETC NORTHEAST PIPELINE LLC/BARTO COMP STA | HUGHESVILLE, Lycoming, PA | Pass | State |
| 2025-04-15 | NFG MIDSTREAM COVINGTON LLC/NETTERMAN COMP STA | WELLSBORO, Tioga, PA | Pending | State |
| 2025-04-15 | EQM GATHERING OPCO LLC/TERRA COMP STA | PLUM CREEK, Armstrong, PA | Pass | State |
| 2025-04-14 | NFG MIDSTREAM COVINGTON LLC/MATZ COMP STA | CHATHAM, Tioga, PA | Pass | State |
| 2025-04-14 | WARREN EP INC/REIMILLER PAD | MESHOPPEN, Wyoming, PA | Pass | State |
| 2025-04-14 | EXPAND OPERATING LLC/CERCA BRA PAD | WYALUSING, Bradford, PA | Pass | State |
| 2025-04-10 | LANCASTER CNTY RRF/ LANCASTER — high-priority violation on file | BAINBRIDGE, Lancaster, PA | Pass | State |
| 2025-04-10 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/SHAW COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-04-10 | SWN PROD CO/CARRAR COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.