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 |
|---|---|---|---|---|
| 2025-03-04 | TENNESSEE GAS PIPELINE CO LLC/MERCER STA 219 | MERCER, Mercer, PA | Pass | State |
| 2025-03-04 | TENNESSEE GAS PIPELINE CO LLC/MERCER STA 219 | MERCER, Mercer, PA | Pass | State |
| 2025-03-04 | BRUNNER ISLAND LLC/BRUNNER ISLAND | YORK HAVEN, York, PA | Pass | State |
| 2025-03-04 | VILLANOVA UNIV/MAIN CAMPUS | VILLANOVA, Delaware, PA | Pass | State |
| 2025-03-04 | EQT ARO LLC/LARRYS CREEK COMP STA | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-03-04 | REPSOL OIL& GAS USA LLC/REPINE COMP STA | LITTLE MEADOWS, Susquehanna, PA | Pass | State |
| 2025-03-04 | HAMMERHEAD MIDSTREAM LLC/ANCHOR COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-03-04 | EXPAND OPERATING LLC/JES BRA WELL PAD | WILMONT, Bradford, PA | Pass | State |
| 2025-03-04 | TRANSCONTINENTAL GAS PIPELINE CO LLC/ COMP STA 620 | HEGINS TOWNSHIP, Schuylkill, PA | Pass | State |
| 2025-03-04 | BOLLES SOUTH WELLPAD — high-priority violation on file | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-03-04 | EXPAND OPERATING LLC/TI-09-BROWN WELL PAD | LIBERTY, Lycoming, PA | Pass | State |
| 2025-03-04 | EXPAND OPERATING LLC/TI-07 CUPPER WELL PAD | LIBERTY, Tioga, PA | Pass | State |
| 2025-03-03 | TRANSCONTINENTAL GAS/SALLADASBURG STATION 520 | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2025-03-03 | BLUESTONE PIPELINE CO/COMFORT LAKE COMP STA | HARMONY TWP, Susquehanna, PA | Pass | State |
| 2025-03-03 | EQT ARO LLC/ELBOW PAD B COMP STA — high-priority violation on file | COGAN HOUSE, Lycoming, PA | Pass | State |
| 2025-03-03 | LIPPINCOTT, F. PAD 1 — high-priority violation on file | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-02-28 | OPTINOVA VALLEY FORGE/PLYMOUTH MEETING | PLYMOUTH MEETING, Montgomery, PA | Pass | State |
| 2025-02-28 | REPSOL OIL & GAS USA LLC/THOMAS COMP STA | TROY, Bradford, PA | Pass | State |
| 2025-02-28 | APPALACHIA MIDSTREAM SVC LLC/STAGECOACH COMP STA | WYALUSING, Bradford, PA | Pass | State |
| 2025-02-28 | CNX MIDSTREAM OPR CO LLC/RHL 22 DEHYDRATION STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-02-27 | SGL CARBON CORP/ST MARYS PLT | SAINT MARYS, Elk, PA | Pass | State |
| 2025-02-27 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/LOWRY COMP STA | AVELLA, Washington, PA | Pass | State |
| 2025-02-27 | REPSOL OIL & GAS USA LLC/PUTNAM COMP STA | TROY, Bradford, PA | Pass | State |
| 2025-02-27 | CNX MIDSTREAM OPR CO LLC /MORRIS DEHY STATION | GRAYSVILLE, Greene, PA | Pass | State |
| 2025-02-27 | TITAN INTL/POTTSTOWN — high-priority violation on file | POTTSTOWN, Montgomery, PA | Fail | State |
| 2025-02-27 | FRONTIDA BIOPHARM INC (FORMERLY MUTUAL PHARMACEUTICAL INC) | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-02-26 | SGL CARBON CORP/ST MARYS PLT | SAINT MARYS, Elk, PA | Pass | State |
| 2025-02-26 | SVC MFG INC/MOUNTAIN TOP | MOUNTAIN TOP, Luzerne, PA | Pass | State |
| 2025-02-26 | MARKWEST LIBERTY MIDSTREAM/WELLING COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-02-26 | APPALACHIA MIDSTREAM SVC LLC/WILMOT COMP STA | WYALUSING, Bradford, PA | Pass | State |
| 2025-02-26 | EQT ARO LLC/LYCOMING H&FC COMP STA — high-priority violation on file | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-02-26 | EXPAND OPERATING LLC/MASSO SUS PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-02-25 | SGL CARBON CORP/ST MARYS PLT | SAINT MARYS, Elk, PA | Pass | State |
| 2025-02-25 | CALPINE BETHLEHEM LLC/BETHLEHEM — high-priority violation on file | BETHLEHEM, Northampton, PA | Pass | State |
| 2025-02-25 | REPSOL OIL & GAS USA LLC/DCNR 010 COMP STA | MORRIS RUN, Tioga, PA | Pass | State |
| 2025-02-25 | EXPAND OPERATING LLC/MCGAVIN WELL PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-02-25 | COMMANDER NAVY REGION MIDATLANTIC/HOST S | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-02-24 | SGL CARBON CORP/ST MARYS PLT | SAINT MARYS, Elk, PA | Pass | State |
| 2025-02-24 | BLUESTONE PIPELINE CO OF PA/HARMONY COMP STA | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-02-22 | TEXAS EASTERN TRANS LP/HOLBROOK STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-02-20 | CABINETWORKS GROUP MICH LLC/ATHENS TWP PLT | SAYRE, Bradford, PA | Pass | State |
| 2025-02-20 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/NANCY STEWART | MOUNT PLEASANT, Washington, PA | Pass | State |
| 2025-02-20 | REPSOL OIL AND GAS USA/TRACT 587 SFL COMP STA | CANTON, Tioga, PA | Pass | State |
| 2025-02-19 | CLEVELAND STEEL CONTAINER/QUAKERTOWN | QUAKERTOWN, Bucks, PA | Fail | State |
| 2025-02-19 | TRANSCONTINENTAL GAS/JACKSON TWP STA 517 | BENTON, Columbia, PA | Pass | State |
| 2025-02-19 | ENERGY DEVS HONEY BROOK LLC/CAERNARVON TWP | NARVON, Lancaster, PA | Pass | State |
| 2025-02-19 | MARKWEST LIBERTY MIDST & RESOURCES/THREE BROTHERS COMP STA | BURGETTSTOWN, Washington, PA | Pass | State |
| 2025-02-19 | EQM GATHERING OPCO LLC/BLUE MOON COMP STA | DAISYTOWN, Washington, PA | Pass | State |
| 2025-02-19 | WILLIAMS FIELD SVC CO/MACNEW COMP STA | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-02-19 | NFG MIDSTREAM COVINGTON LLC/TRACT 007 COMP STA | WELLSBORO, Tioga, PA | Pass | State |
| 2025-02-19 | FRONTIDA BIOPHARM INC (FORMERLY MUTUAL PHARMACEUTICAL INC) | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-02-18 | PENN MED LANCASTER GEN HOSP/LANCASTER GEN HOSP | LANCASTER, Lancaster, PA | Pass | State |
| 2025-02-18 | NFG MIDSTREAM COVINGTON LLC/COVINGTON COMP STA | COVINGTON, Tioga, PA | Pass | State |
| 2025-02-18 | WILLIAMS-TRANSCO/COMPRESSOR STA 610 | MILLVILLE, Columbia, PA | Pass | State |
| 2025-02-18 | PAYNE, D. PAD 1 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-02-18 | HAUSER, J. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-02-13 | WILLIAMS FIELD SVC CO LLC/GIBSON COMP STA | SOUTH GIBSON, Susquehanna, PA | Pass | State |
| 2025-02-12 | COLUMBIA GAS TRANS LLC/EAGLE | CHESTER SPRINGS, Chester, PA | Pass | State |
| 2025-02-12 | ENERGY CTR HBG LLC/ENERGY CTR PAXTON LLC | HARRISBURG, Dauphin, PA | Pass | State |
| 2025-02-12 | WILLIAMS FIELD SVC CO LLC/WHITE COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-02-12 | WILLIAMS FIELD SVC CO LLC/WHITE COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-02-12 | GRAYS FERRY COGEN PARTNERSHIP/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-02-11 | WILLIAMS FIELD SVC CO LLC/MILLER COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-02-11 | WILLIAMS FIELD SVC CO LLC/GIBSON COMP STA | SOUTH GIBSON, Susquehanna, PA | Pass | State |
| 2025-02-11 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/MCMICHAEL COMP STA | CLINTON, Beaver, PA | Pass | State |
| 2025-02-11 | COTERRA ENERGY INC/ANDERSON R PAD 1 — high-priority violation on file | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-02-10 | INR MIDSTREAM LLC/WEST SUMMIT COMP STA | LAKE LYNN, Fayette, PA | Pass | State |
| 2025-02-10 | WILLIAMS FIELD SVC CO LLC/MILLER COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-02-10 | MARKWEST LIBERTY MIDSTREAM/TIMBERLAKE COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-02-07 | SUNOCO MIDSTREAM LLC/WILLIAMSPORT - SUNOCO LLC | SOUTH WILLIAMSPORT, Lycoming, PA | Pass | State |
| 2025-02-07 | EQM GATHERING OPCO LLC/JUPITER COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-02-06 | CP CONVERTERS INC/BRISTOL TWP | BRISTOL, Bucks, PA | Pass | State |
| 2025-02-06 | INFINITY NATURAL RESOURCES SOUTH BEND COMP STA | SOUTH BEND TWP, Armstrong, PA | Pass | State |
| 2025-02-05 | DART CONTAINER CORP/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2025-02-05 | DART CONTAINER CORP/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2025-02-05 | EM RESOURCES LLC/MONTOUR PLT | DANVILLE, Montour, PA | Pending | State |
| 2025-02-05 | SUSQ HUCKLEBERRY PAD C | ROARING BRANCH, Tioga, PA | Pass | State |
| 2025-02-04 | TOWER HEALTH SYS/READING HOSP | READING, Berks, PA | Pass | State |
| 2025-02-04 | BLUE RIDGE LDFL CO/BLUE RIDGE LDFL | CHAMBERSBURG, Franklin, PA | Pass | State |
| 2025-02-04 | OPCO INC/LATROBE | LATROBE, Westmoreland, PA | Pass | State |
| 2025-02-04 | SWN ENERGY PROD CO/SEYMOUR PAD | LAWTON, Bradford, PA | Pass | State |
| 2025-02-04 | COTERRA ENERGY INC/LAMBERT R PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-02-04 | GRIFFITHS, J. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-02-03 | K PETROLEUM INC/HACKETT COMP STA — high-priority violation on file | BENTLEYVILLE, Washington, PA | Fail | State |
| 2025-01-30 | COLUMBIA GAS TRANS CORP/HELLERTOWN CT | HELLERTOWN, Northampton, PA | Pass | State |
| 2025-01-30 | J W ZAPRAZNY/NEW RINGGOLD | NEW RINGGOLD, Schuylkill, PA | Pass | State |
| 2025-01-30 | USS CORP/EDGAR THOMSON WORKS — high-priority violation on file | BRADDOCK, Allegheny, PA | Fail | Local |
| 2025-01-30 | VICINITY ENERGY EDISON/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-01-29 | TRANSCONTINENTAL GAS/BEAR CREEK STA 515 | BEAR CREEK, Luzerne, PA | Pass | State |
| 2025-01-29 | WASTE MGMT DSPL SVC /GROWS LDFL | MORRISVILLE, Bucks, PA | Pass | State |
| 2025-01-29 | TEXAS EASTERN TRANS LP/TE DELMONT COMP STA | GREENSBURG, Westmoreland, PA | Pass | State |
| 2025-01-29 | TEXAS EASTERN TRANS LP/GRANTVILLE | GRANTVILLE, Dauphin, PA | Pass | State |
| 2025-01-29 | HAMMERHEAD MIDSTREAM LLC/ANCHOR COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-01-29 | RANGE RESOURCES APPALACHIA LLC/SGL 075A 12682 | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-01-29 | USS CORP/EDGAR THOMSON WORKS — high-priority violation on file | BRADDOCK, Allegheny, PA | Fail | Local |
| 2025-01-29 | VICINITY ENERGY EDISON/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2025-01-28 | COLUMBIA GAS TRANS LLC/ARTEMAS COMP STA | ARTEMAS, Bedford, PA | Pass | State |
| 2025-01-28 | TEXAS EASTERN TRANS LP/BERNVILLE STA | BERNVILLE, Berks, PA | Pass | State |
| 2025-01-28 | ROVER PIPELINE LLC/BULGER COMP STA | BULGER, Washington, PA | Pass | State |
| 2025-01-28 | RANGE RESOURCES APPALACHIA LLC/LAUREL HILL G | TROUT RUN, Lycoming, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.