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 |
|---|---|---|---|---|
| 2025-11-07 | HEIDELBERG MTLS NORTHEAST PA/PENNS PARK PLT — high-priority violation on file | PENNS PARK, Bucks, PA | Pass | State |
| 2025-11-07 | HAMILTON LIBERTY LLC/HAMILTON LIBERTY LLC — high-priority violation on file | WYSOX, Bradford, PA | Pass | State |
| 2025-11-07 | ISA WELL SITE — high-priority violation on file | COGAN STATION, Lycoming, PA | Pass | State |
| 2025-11-06 | EXPAND OPERATING LLC/INNES PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-11-06 | CRANE, J PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pending | State |
| 2025-11-06 | DIAZ FAMILY, LP PAD 2 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-11-05 | GRAFTECH USA LLC/ST MARYS | SAINT MARYS, Elk, PA | Pass | State |
| 2025-11-05 | ENERGY DEVS HONEY BROOK LLC/CAERNARVON TWP | NARVON, Lancaster, PA | Pass | State |
| 2025-11-05 | SENECA RESOURCES CO LLC/SRC COMP STA | MT. JEWETT, McKean, PA | Pass | State |
| 2025-11-05 | MARKWEST LIBERTY MIDST & RESOURCES/THREE BROTHERS COMP STA | BURGETTSTOWN, Washington, PA | Pass | State |
| 2025-11-05 | UGI AUBURN GATHERING LLC/ MANNING COMPRESSOR LNG STA | MESHOPPEN, Wyoming, PA | Pass | State |
| 2025-11-05 | PA GEN ENERGY CO LLC/COP TRACT 596 PAD B | ROARING BRANCH, Tioga, PA | Pass | State |
| 2025-11-04 | PEOPLES GAS CO LLC/KINTER STA | INDIANA, Indiana, PA | Pass | State |
| 2025-11-04 | HEIDELBERG MTLS NORTHEAST PA/PENNS PARK PLT — high-priority violation on file | PENNS PARK, Bucks, PA | Pass | State |
| 2025-11-04 | NFG MIDSTREAM COVINGTON LLC/SHAW COMP STA | MAINESBURG, Tioga, PA | Pending | State |
| 2025-11-04 | ROVER PIPELINE LLC/BULGER COMP STA | BULGER, Washington, PA | Pass | State |
| 2025-11-03 | PA DEPT OF MILITARY/HOLLIDAYSBURG VETERANS HOME | HOLLIDAYSBURG, Blair, PA | Pass | State |
| 2025-11-03 | RANGE RESOURCES APPALACHIA LLC/LAUREL HILL WELL PAD B | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-10-31 | KIMBERLY CLARK CORP/CHESTER OPR | CHESTER, Delaware, PA | Pass | State |
| 2025-10-31 | HYDRO EXTRUSION USA, LLC/CRESSONA | CRESSONA, Schuylkill, PA | Pass | State |
| 2025-10-30 | INTER POWER AHLCON LP/COLVER POWER PROJ — high-priority violation on file | COLVER, Cambria, PA | Pass | State |
| 2025-10-30 | NEXTERA RENEWABLE FUELS LLC/FREY FARM CRESWELL LDFL | CONESTOGA, Lancaster, PA | Pass | State |
| 2025-10-30 | BRIGHTSMITH LLC/FALLS TWP | MORRISVILLE, Bucks, PA | Pass | State |
| 2025-10-29 | COLUMBIA GAS TRANS CORP/FORKS TWP FAC EASTON CTA | EASTON, Northampton, PA | Pass | State |
| 2025-10-29 | YORK CNTY SOLID WASTE/YORK CNTY RESOURCE RECOVERY — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-10-29 | SUNOCO MIDSTREAM LLC/ALTOONA | ALTOONA, Blair, PA | Pass | State |
| 2025-10-29 | ADELPHIA GATEWAY/MARTINS CREEK STA | BANGOR, Northampton, PA | Pass | State |
| 2025-10-28 | MERCK SHARP & DOHME LLC/WEST PT | WEST POINT, Montgomery, PA | Pass | State |
| 2025-10-28 | EQM GATHERING OPCO LLC/IO COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-10-28 | REPSOL OIL 7 GAS USA LLC/BENNET COMP STA | LERAYSVILLE, Bradford, PA | Pass | State |
| 2025-10-25 | FLOWERS BAKING CO/OXFORD PLT — high-priority violation on file | OXFORD, Chester, PA | Pass | State |
| 2025-10-24 | CLEVELAND STEEL CONTAINER/QUAKERTOWN | QUAKERTOWN, Bucks, PA | Pass | State |
| 2025-10-24 | DIVERSIFIED PROD LLC/NV 60 WELLPAD | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-10-23 | TEXAS EASTERN TRANS LP/BECHTELSVILLE | BECHTELSVILLE, Berks, PA | Pass | State |
| 2025-10-23 | REGENCY MARCELLUS GAS GATHERING/CANOE RUN COMP STA | SALLADASBURG, Lycoming, PA | Pass | State |
| 2025-10-23 | WILLIAMS FIELD SVC CO LLC/LATHROP COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-10-23 | REGENCY MARCELLUS GAS GATHERING LLC/OGONTZ WEST COMP STA | CUMMINS TWP, Lycoming, PA | Pass | State |
| 2025-10-22 | MAGNESITA REFRACTORIES/YORK — high-priority violation on file | YORK, York, PA | Pass | State |
| 2025-10-22 | TEXAS EASTERN TRANS LP/MARIETTA | MARIETTA, Lancaster, PA | Pass | State |
| 2025-10-22 | PEOPLES NATURAL GAS/EGRY STA | CLARKSBURG, Indiana, PA | Pass | State |
| 2025-10-22 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | EVANS CITY, Butler, PA | Pass | State |
| 2025-10-22 | BKV OPERATING LLC/BAKER WEST COMPRESSOR STATION | FORREST LAKE TWP, Susquehanna, PA | Pass | State |
| 2025-10-22 | EXPAND OPER LLC/ROLAND BRA PAD | WILMONT, Bradford, PA | Pass | State |
| 2025-10-22 | CABOT OIL & GAS CORP/FOLTZ J PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-10-22 | EXPAND OPERATING LLC/HOLTAN SUS WELLPAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-10-22 | MOORE, S. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-21 | TEXAS EASTERN TRANS LP/LILLY STA | LILLY, Cambria, PA | Pass | State |
| 2025-10-21 | CNX MIDSTREAM OPR CO LLC/BUCKLAND COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-10-21 | EXPAND OPERATING LLC/WOOSMAN PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-10-21 | FLOWER, T. PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-10-21 | WOOD, E. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-20 | EQT ARO LLC/VARGO COMP STA — high-priority violation on file | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-10-20 | CABOT OIL & GAS CORP/TEDDICK, M. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-10-20 | CABOT OIL & GAS CORP/JEFFERS FARMS PAD 5 | GIBSON, Susquehanna, PA | Pass | State |
| 2025-10-17 | KEYSTONE PORTLAND CEMENT/EAST ALLEN — high-priority violation on file | BATH, Northampton, PA | Pass | State |
| 2025-10-17 | BUCKEYE ENERGY SVC LLC/MACUNGIE TERMINAL | EMMAUS, Lehigh, PA | Pass | State |
| 2025-10-17 | REGENCY MARCELLUS GAS GATHERING LLC/POORMAN COMP STA | LOCK HAVEN, Clinton, PA | Pass | State |
| 2025-10-17 | REGENCY MARCELLUS GAS GATHERING LLC/POORMAN COMP STA | LOCK HAVEN, Clinton, PA | Pass | State |
| 2025-10-17 | DIVERSIFIED PROD LLC/NV 34 WELLPAD — high-priority violation on file | PROSPERITY, Washington, PA | Pass | State |
| 2025-10-17 | MCGHEE SCRAP CO/BEECH CREEK FAC | BEECH CREEK, Centre, PA | Pass | State |
| 2025-10-16 | PROCTER & GAMBLE PAPER PROD CO/MEHOOPANY | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-10-16 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2025-10-16 | WHITE PINES CORP/WHITE PINES LDFL | MILLVILLE, Columbia, PA | Pass | State |
| 2025-10-16 | SUSQUEHANNA GATHERING/CDP 1 COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-10-16 | DIVERSIFIED PROD LLC/NINEVEH 58 WELL PAD — high-priority violation on file | PROSPERITY, Washington, PA | Pass | State |
| 2025-10-16 | HALLIDAY, A. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-15 | PROCTER & GAMBLE PAPER PROD CO/MEHOOPANY | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-10-15 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2025-10-15 | GRAYMONT PA INC/PLEASANT GAP & CON-LIME & BELLEFONTE PLTS | BELLEFONTE, Centre, PA | Pass | State |
| 2025-10-15 | NFG MIDSTREAM COVINGTON LLC/STOCK 144 COMP STA | WELLSBORO, Tioga, PA | Pending | State |
| 2025-10-15 | UE-02102PA LLC/FED EX ALLENTOWN | ALLEN TWP, Northampton, PA | Pass | State |
| 2025-10-15 | UGI GIBRALTAR GATHERING LLC/GIBRALTAR COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-10-15 | CORBIN, J. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-10-15 | BENEDIKT, K. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-14 | FRES-CO SYSTEM USA INC/TELFORD PLT — high-priority violation on file | TELFORD, Bucks, PA | Pass | State |
| 2025-10-14 | MONROE ENERGY LLC/TRAINER — high-priority violation on file | TRAINER, Delaware, PA | Pass | State |
| 2025-10-14 | WILLIAMS FIELD SVC CO LLC/WILCOX COMP STA | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2025-10-14 | NFG MIDSTREAM CLERMONT LLC/CLERMONT EAST COMP STA | WILCOX, McKean, PA | Pass | State |
| 2025-10-14 | EQM GATHERING OPCO LLC/MCINTOSH COMP STA | FINLEYVILLE, Washington, PA | Pass | State |
| 2025-10-14 | EQM GATHERING OPCO LLC/MCINTOSH COMP STA | FINLEYVILLE, Washington, PA | Pass | State |
| 2025-10-14 | WCAA UPSTREAM LLC/GRAHAM WELLPAD | DARRAGH, Westmoreland, PA | Pass | State |
| 2025-10-13 | WILLIAMS FIELD SVC CO LLC/JONES COMP STA | FRIENDSVILLE, Susquehanna, PA | Pass | State |
| 2025-10-13 | REGENCY MARCELLUS GAS GATHERING LLC/TAYLOR COMP STA | CANTON, Bradford, PA | Pass | State |
| 2025-10-13 | PINE RUN MIDSTREAM LLC/BICKER COMP STA | CABOT, Butler, PA | Pass | State |
| 2025-10-13 | PRECISION CAPITAL, LP PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-10-13 | TUCKER, H. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-10 | TENNESSEE GAS PIPELINE CO/317 TROY STA | TROY, Bradford, PA | Pass | State |
| 2025-10-09 | GLAXO SMITHKLINE/UPPER PROVIDENCE — high-priority violation on file | COLLEGEVILLE, Montgomery, PA | Pass | State |
| 2025-10-09 | TENNESSEE GAS PIPELINE CO/315 WELLSBORO | WELLSBORO, Tioga, PA | Pass | State |
| 2025-10-09 | TEXAS EASTERN TRANS LP/TE DELMONT COMP STA | GREENSBURG, Westmoreland, PA | Pass | State |
| 2025-10-09 | DALRYMPLE GRAVEL & CONTR/BRADFORD CNTY PLT | SAYRE, Bradford, PA | Pass | State |
| 2025-10-09 | MAINESBURG GS LP/MAINESBURG GATHERING STA | MANSFIELD, Tioga, PA | Pass | State |
| 2025-10-08 | TENNESSEE GAS PIPELINE CO/319 WYALUSING | WYALUSING, Bradford, PA | Pass | State |
| 2025-10-08 | MAINESBURG GS LP/WELLS COMP STA | COVINGTON, Tioga, PA | Pass | State |
| 2025-10-07 | ELLWOOD QUALITY STEELS CO/NEW CASTLE PLT | NEW CASTLE, Lawrence, PA | Pass | State |
| 2025-10-07 | PA STATE SYS OF HIGHER ED/SLIPPERY ROCK UNIV PA | SLIPPERY ROCK, Butler, PA | Pass | State |
| 2025-10-07 | DOMTAR PAPER CO/JOHNSONBURG MILL — high-priority violation on file | JOHNSONBURG, Elk, PA | Pass | State |
| 2025-10-07 | JESSOP STEEL LLC/WASHINGTON PLT | WASHINGTON, Washington, PA | Pass | State |
| 2025-10-07 | MARKWEST LIBERTY MIDSTREAM RES/DOWN HOME COMPRESSOR STATION | ROBINSON TWP, Washington, PA | Pass | State |
| 2025-10-03 | ONEIDA VALLEY MIDSTRAM LLC/CONSTELLATION COMP STA | WEST SUNBURY, Butler, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.