EPA Air · stack tests by state and year

Air-emissions stack tests in Pennsylvania, 2026

501Stack 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 2026; one facility can appear more than once, because this is a record of what happened rather than a list of places.

Counties in Pennsylvania, 2026

Pennsylvania, other years

Air-emissions stack tests recorded in Pennsylvania, 2026

Date	Facility	Where	Kind	Agency
2026-02-12	REPSOL OIL & GAS USA LLC/WATKINS HILL RD	COLUMBIA CROSS ROADS, Bradford, PA	Pass	State
2026-02-12	GREYLOCK MIDSTREAM LLC/VERES COMP STA	WAYNESBURG, Greene, PA	Pass	State
2026-02-12	BOLLES SOUTH WELLPAD — high-priority violation on file	NEW MILFORD, Susquehanna, PA	Pass	State
2026-02-12	NAVAL SURFACE WARFARE CENTER - PHILADELPHIA DIVISION	PHILADELPHIA, Philadelphia, PA	Pass	Local
2026-02-11	EXPAND OPERATING LLC/TI-09-BROWN WELL PAD	LIBERTY, Lycoming, PA	Pass	State
2026-02-11	EXPAND OPERATING LLC/TI-07 CUPPER WELL PAD	LIBERTY, Tioga, PA	Pass	State
2026-02-11	NAVAL SURFACE WARFARE CENTER - PHILADELPHIA DIVISION	PHILADELPHIA, Philadelphia, PA	Pass	Local
2026-02-10	K PETROLEUM INC/HACKETT COMP STA — high-priority violation on file	BENTLEYVILLE, Washington, PA	Pass	State
2026-02-10	REPSOL OIL & GAS USA LLC/THOMAS COMP STA	TROY, Bradford, PA	Pass	State
2026-02-10	MARKWEST LIBERTY MIDSTREAM & RESOURCES/MCMICHAEL COMP STA	CLINTON, Beaver, PA	Pass	State
2026-02-10	TRANSCONTINENTAL GAS PIPELINE CO LLC/ COMP STA 620	HEGINS TOWNSHIP, Schuylkill, PA	Pass	State
2026-02-10	AXALTA COATING SYSTEMS	PHILADELPHIA, Philadelphia, PA	Pass	Local
2026-02-09	DIVERSIFIED PROD LLC/BROOKVILLE SOUTH COMP STA	BROOKVILLE, Jefferson, PA	Pass	State
2026-02-09	XTO ENERGY INC/WINSLOW	REYNOLDSVILLE, Jefferson, PA	Pass	State
2026-02-09	RANGE RESOURCES APPALACHIA LLC/LAUREL HILL G	TROUT RUN, Lycoming, PA	Pass	State
2026-02-09	MARKWEST LIBERTY MIDSTREAM/TIMBERLAKE COMP STA	CLAYSVILLE, Washington, PA	Pass	State
2026-02-06	GREYLOCK PRODUCTION LLC/BEACON WELL PAD	WAYNESBURG, Greene, PA	Pass	State
2026-02-05	TEXAS EASTERN TRANS LP/PERULACK STA	EAST WATERFORD, Juniata, PA	Pass	State
2026-02-05	EQM GATHERING OPCO LLC/JUPITER COMP STA	WAYNESBURG, Greene, PA	Pass	State
2026-02-05	LAUREL MTN MIDSTREAM OPR LLC/SHAMROCK COMP STA — high-priority violation on file	SALEM, Fayette, PA	Pass	State
2026-02-05	EXPAND OPERATING LLC/GU-G SOUTH WELL PAD	WYALUSING, Bradford, PA	Pass	State
2026-02-05	RANGE RESOURCES APPALACHIA LLC/SGL 075A 12682	TROUT RUN, Lycoming, PA	Pass	State
2026-02-05	SUSQ HUCKLEBERRY PAD C	ROARING BRANCH, Tioga, PA	Pass	State
2026-02-04	REPSOL OIL & GAS USA LLC/EDSELL COMP STA	LE RAYSVILLE, Bradford, PA	Pass	State
2026-02-04	US STEEL CORP/IRVIN PLT	WEST MIFFLIN, Allegheny, PA	Pass	Local
2026-02-04	TEMPLE UNIV/ MAIN CAMPUS — high-priority violation on file	PHILADELPHIA, Philadelphia, PA	Fail	Local
2026-02-04	TEMPLE UNIV/ MAIN CAMPUS — high-priority violation on file	PHILADELPHIA, Philadelphia, PA	Fail	Local
2026-02-03	COLUMBIA GAS TRANS CORP/GETTYSBURG COMP STA	GETTYSBURG, Adams, PA	Pass	State
2026-02-03	EXPAND OPERATING LLC/MCGAVIN WELL PAD	MESHOPPEN, Susquehanna, PA	Pass	State
2026-02-03	WILLIAMS, D. PAD 1	KINGSLEY, Susquehanna, PA	Pass	State
2026-02-02	REGENCY MARCELLUS GAS GATHERING/CANOE RUN COMP STA	SALLADASBURG, Lycoming, PA	Pass	State
2026-02-02	DTM TIOGA GAS GATHERING LLC/TIOGA CENTRALIZED DEHY FAC	WESTFIELD, Tioga, PA	Pass	State
2026-02-02	US STEEL CORP/IRVIN PLT	WEST MIFFLIN, Allegheny, PA	Pass	Local
2026-01-30	UNIV OF PGH/PGH CAMPUS	PITTSBURGH, Allegheny, PA	Pending	Local
2026-01-29	PA GEN ENERGY CO LLC/HORTON RUN RD COMP STA	CONRAD, Potter, PA	Pass	State
2026-01-29	COTERRA ENERGY INC/CARPENETTI R PAD 1	NICHOLSON, Susquehanna, PA	Pass	State
2026-01-29	COTERRA ENERGY INC/MYERS R PAD 1	HOP BOTTOM, Susquehanna, PA	Pass	State
2026-01-29	UNIV OF PGH/PGH CAMPUS	PITTSBURGH, Allegheny, PA	Pass	Local
2026-01-29	UNIV OF PGH/PGH CAMPUS	PITTSBURGH, Allegheny, PA	Pending	Local
2026-01-28	REPSOL OIL& GAS USA LLC/REPINE COMP STA	LITTLE MEADOWS, Susquehanna, PA	Pass	State
2026-01-28	EXPAND OPERATING LLC/SIVERS BRA PAD	LACEYVILLE, Bradford, PA	Pass	State
2026-01-28	HOWELL, G. PAD 1	MESHOPPEN, Susquehanna, PA	Pass	State
2026-01-28	BUSIK, J. PAD 1	MONTROSE, Susquehanna, PA	Pass	State
2026-01-28	LIPPINCOTT, F. PAD 1 — high-priority violation on file	KINGSLEY, Susquehanna, PA	Pass	State
2026-01-28	P&G 3 WELL SITE	MESHOPPEN, Wyoming, PA	Pass	State
2026-01-27	REGENCY MARCELLUS GATHERING LLC/BRADFORD WEST COMP STA	GRANVILLE SUMMIT, Bradford, PA	Pass	State
2026-01-27	REGENCY MARCELLUS GAS GATHERING LLC/LONE WALNUT COMP STA	JERSEY SHORE, Lycoming, PA	Pass	State
2026-01-27	COTERRA ENERGY INC/BURKE G PAD 1	MESHOPPEN, Susquehanna, PA	Pass	State
2026-01-27	DOBROSIELSKI, S PAD 1	MESHOPPEN, Susquehanna, PA	Pass	State
2026-01-23	CLEAN EARTH OF SOUTHEAST PA/MORRISVILLE — high-priority violation on file	MORRISVILLE, Bucks, PA	Pending	State
2026-01-23	REPSOL OIL & GAS USA LLC/PUTNAM COMP STA	TROY, Bradford, PA	Pass	State
2026-01-23	ABBOTT, M. PAD 1	NEW MILFORD, Susquehanna, PA	Pass	State
2026-01-22	APPALACHIA MIDSTREAM SVC LLC/STAGECOACH COMP STA	WYALUSING, Bradford, PA	Pass	State
2026-01-22	GREYLOCK MIDSTREAM LLC/KUHL-SKIB COMP STA	JEFFERSON, Greene, PA	Pass	State
2026-01-22	ENERGY TRANSF MKT & TERM LP/MARCUS HOOK TERM — high-priority violation on file	MARCUS HOOK, Delaware, PA	Pass	State
2026-01-22	COTERRA ENERGY INC/MEAD B PAD 1 — high-priority violation on file	MONTROSE, Susquehanna, PA	Pass	State
2026-01-22	RU-23 MITCHELL WELL PAD	NEW MILFORD, Susquehanna, PA	Pass	State
2026-01-22	NEWMAN & CO/PAPER RECYCLER — high-priority violation on file	PHILADELPHIA, Philadelphia, PA	Pass	Local
2026-01-21	GEISINGER MED CTR/DANVILLE	DANVILLE, Montour, PA	Pass	State
2026-01-21	EQM GATHERING OPCO LLC/PIPERS RIDGE INTERCONNECT	WAYNESBURG, Greene, PA	Pass	State
2026-01-20	MONTOUR LLC/MONTOUR SES	WASHINGTONVILLE, Montour, PA	Pass	State
2026-01-20	WILLIAMS FIELD SVC CO LLC/CHURCH COMP STA	SPRINGVILLE, Susquehanna, PA	Pass	State
2026-01-20	NATL FUEL GAS SUPPLY CORP/MERCER COMP STA	MERCER, Mercer, PA	Pass	State
2026-01-20	REPSOL OIL & GAS USA LLC/DCNR 010 COMP STA	MORRIS RUN, Tioga, PA	Pass	State
2026-01-20	EXPAND OPERATING LLC/NR-23 FOUR BUCKS PAD	SUSQUEHANNA, Susquehanna, PA	Pass	State
2026-01-19	EQM GATHERING OPCO LLC/HOPEWELL RIDGE INTERCONNECT STA	SYCAMORE, Greene, PA	Pass	State
2026-01-19	LIPPINCOTT, F. PAD 1 — high-priority violation on file	KINGSLEY, Susquehanna, PA	Pending	State
2026-01-16	SNYDER BROS INC/MUSHROOM MINE COMP STA	WORTHINGTON, Armstrong, PA	Pass	State
2026-01-15	HAMILTON PATRIOT LLC/HAMILTON PATRIOT GENERATION PLANT — high-priority violation on file	MONTGOMERY, Lycoming, PA	Pass	State
2026-01-15	EXCO APPALACHIA MIDSTREAM LLC/POVERTY HILL COMP STA	KITTANNING, Armstrong, PA	Pass	State
2026-01-14	COLUMBIA GAS TRANS CORP/HELLERTOWN CT	HELLERTOWN, Northampton, PA	Pass	State
2026-01-14	APPALACHIA MIDSTREAM SVC LLC/AUBURN COMP STA	MESHOPPEN, Susquehanna, PA	Pass	State
2026-01-14	GREYLOCK PROD LLC/ANSONVILLE COMP STA	NEW MILLPORT, Clearfield, PA	Pass	State
2026-01-14	HEP PENNSYLVANIA GATHERING LLC/LAUREL HILL COMP STA	TROUT RUN, Lycoming, PA	Pass	State
2026-01-14	HEP PENNSYLVANIA GATHERING LLC/LAUREL HILL COMP STA	TROUT RUN, Lycoming, PA	Pass	State
2026-01-14	HEP PENNSYLVANIA GATHERING LLC/TIOGA CPF#2 COMP STA	LIBERTY, Tioga, PA	Pass	State
2026-01-13	COLLEGEVILLE HOLDINGS LLC/COLLEGEVILLE	COLLEGEVILLE, Montgomery, PA	Pass	State
2026-01-13	PA DPW/WARREN STATE HOSP	NORTH WARREN, Warren, PA	Pass	State
2026-01-13	APPALACHIA MIDSTREAM SVC LLC/RATTLESNAKE HILL COMP STA	AUBURN TOWNSHIP, Susquehanna, PA	Pass	State
2026-01-13	NFG MIDSTREAM COVINGTON LLC/BREON COMP STA	MANSFIELD, Tioga, PA	Pass	State
2026-01-13	REGENCY MARCELLUS GAS GATHERING LLC/MEHOOPANY STA	TUNKHANNOCK, Wyoming, PA	Pass	State
2026-01-13	SWN PRODUCTION CO LLC/KING NORTH 3H	NEW MILFORD, Susquehanna, PA	Pass	State
2026-01-12	NFG MIDSTREAM CLERMONT LLC/CLERMONT WEST COMP STA	EMPORIUM, Elk, PA	Pass	State
2026-01-12	INFINITY NATURAL RESOURCES SOUTH BEND COMP STA	SOUTH BEND TWP, Armstrong, PA	Pass	State
2026-01-09	RAD MFG LLC/NESCOPECK	NESCOPECK, Luzerne, PA	Pass	State
2026-01-09	GREYLOCK PROD LLC/WILDCAT WELL PAD	MT MORRIS, Greene, PA	Pass	State
2026-01-08	REGENCY MARCELLUS GAS GATHERING LLC/QUAKER STATE RD COMP STA	MONTOURSVILLE, Lycoming, PA	Pass	State
2026-01-08	WILLIAMS FIELD SVC CO LLC/GIBSON COMP STA	SOUTH GIBSON, Susquehanna, PA	Pass	State
2026-01-08	ADELPHIA GATEWAY LLC/MARCUS HOOK COMPRESSOR STA	LINWOOD, Delaware, PA	Pass	State
2026-01-08	SWN ENERGY PROD CO/SEYMOUR PAD	LAWTON, Bradford, PA	Pass	State
2026-01-07	ADVANCED CAST PRODUCTS/MEADVILLE — high-priority violation on file	MEADVILLE, Crawford, PA	Pass	State
2026-01-07	ETC NORTHEAST PIPELINE LLC/BARTO COMP STA	HUGHESVILLE, Lycoming, PA	Pass	State
2026-01-07	NFG MIDSTREAM COVINGTON LLC/MATZ COMP STA	CHATHAM, Tioga, PA	Pass	State
2026-01-07	WR-79 MITCHELL WELL PAD	MONTROSE, Susquehanna, PA	Pass	State
2026-01-06	PERRYMAN CO/TITANIUM CONVERSION FAC — high-priority violation on file	HOUSTON, Washington, PA	Pass	State
2026-01-06	NFG MIDSTREAM COVINGTON LLC/LAWTON COMP STA	WELLSBORO, Tioga, PA	Pass	State
2026-01-06	EQM GATHERING OPCO LLC/IO COMP STA	WAYNESBURG, Greene, PA	Pass	State
2026-01-06	WILLIAMS FIELD SVC CO LLC/WHITE COMP STA	SPRINGVILLE, Susquehanna, PA	Pass	State
2026-01-05	GREYLOCK MIDSTREAM LLC/CUMBERLAND HENDERSON COMP STA	CARMICHAELS, Greene, PA	Pass	State
2026-01-05	DELTA WELL SITE — high-priority violation on file	LINDEN, Lycoming, PA	Pass	State

Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.