EPA Air · stack tests by state and year
Air-emissions stack tests in Ohio, 2026
- 1,474Stack 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 Ohio 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 Ohio, 2026
- Belmont County 206
- Monroe County 168
- Harrison County 159
- Carroll County 104
- Lucas County 100
- Jefferson County 75
- Noble County 64
- Columbiana County 55
- Guernsey County 45
- Stark County 44
- Wayne County 28
- Mahoning County 28
- Fulton County 25
- Perry County 25
- Richland County 24
- Hamilton County 21
- Marion County 17
- Scioto County 15
- Greene County 15
- Muskingum County 15
- Tuscarawas County 15
- Crawford County 15
- Wood County 13
- Ashtabula County 12
- Brown County 11
- Wyandot County 11
- Butler County 9
- Seneca County 9
- Trumbull County 9
- Cuyahoga County 8
- Defiance County 8
- Lake County 8
- Ottawa County 8
- Washington County 7
- Coshocton County 7
- Pickaway County 7
- Union County 7
- Miami County 6
- Montgomery County 6
- Erie County 6
- Darke County 6
- Shelby County 5
- Undetermined County 5
- Franklin County 4
- Summit County 4
- Portage County 4
- Putnam County 3
- Holmes County 3
- Fayette County 3
- Licking County 3
- Jackson County 3
Ohio, other years
Air-emissions stack tests recorded in Ohio, 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - DICKSON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - DICKSON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - DICKSON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - GORDON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - GORDON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - GORDON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - GORDON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - GORDON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | ASCENT RESOURCES - UTICA LLC - GORDON CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-16 | LES RENEWABLE NG LLC - PIKE RNG | WAVERLY, Pike, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA, LLC - CASTON 31-11N-7W | LONDONDERRY, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA, LLC - CASTON 31-11N-7W | LONDONDERRY, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA, LLC - CASTON 31-11N-7W | LONDONDERRY, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA LLC - RED HILL FARMS 1-3N-1W | FREEPORT, Harrison, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA LLC - RED HILL FARMS 1-3N-1W | FREEPORT, Harrison, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA LLC - RED HILL FARMS 1-3N-1W | FREEPORT, Harrison, OH | Pass | State |
| 2026-06-12 | BLUE RACER MIDSTREAM, LLC - MIZER STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-06-12 | BLUE RACER MIDSTREAM, LLC - MIZER STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-06-12 | BLUE RACER MIDSTREAM, LLC - MIZER STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-06-12 | GULFPORT APPALACHIA, LLC - GEHRIG PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-12 | GULFPORT APPALACHIA, LLC - GEHRIG PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-12 | GULFPORT APPALACHIA, LLC - GEHRIG PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | BLUE RACER MIDSTREAM LLC - HFS#3 (ATHENS B) | NEW ATHENS, Harrison, OH | Pass | State |
| 2026-06-10 | BLUE RACER MIDSTREAM LLC - HFS#3 (ATHENS B) | NEW ATHENS, Harrison, OH | Pass | State |
| 2026-06-10 | BLUE RACER MIDSTREAM LLC - HFS#3 (ATHENS B) | NEW ATHENS, Harrison, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - SCHUMACHER WELL PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - SCHUMACHER WELL PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - SCHUMACHER WELL PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - MORRIS PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - MORRIS PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | GULFPORT APPALACHIA, LLC - MORRIS PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-10 | NOVELIS ALR RECYCLING OF OHIO LLC — high-priority violation on file | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-06-10 | NOVELIS ALR RECYCLING OF OHIO LLC — high-priority violation on file | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-06-10 | NOVELIS ALR RECYCLING OF OHIO LLC — high-priority violation on file | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-06-09 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Fail | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - FLEAGANE PLT BL | BELLAIRE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - FLEAGANE PLT BL | BELLAIRE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - FLEAGANE PLT BL | BELLAIRE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - BLESSED RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - BLESSED RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - BLESSED RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - GUERNSEY CO FIELD STATION #1 | FAIRVIEW, Guernsey, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - GUERNSEY CO FIELD STATION #1 | FAIRVIEW, Guernsey, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - GUERNSEY CO FIELD STATION #1 | FAIRVIEW, Guernsey, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - HFS#2 | CADIZ, Harrison, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - HFS#2 | CADIZ, Harrison, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - HFS#2 | CADIZ, Harrison, OH | Pass | State |
| 2026-06-09 | KENWORTH TRUCK COMPANY | CHILLICOTHE, Ross, OH | Pass | State |
| 2026-06-09 | KENWORTH TRUCK COMPANY | CHILLICOTHE, Ross, OH | Pass | State |
| 2026-06-08 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-08 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-08 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-08 | BLUE RACER MIDSTREAM LLC - BFS#2 (FLUSHING A) | FLUSHING, Belmont, OH | Pass | State |
| 2026-06-08 | BLUE RACER MIDSTREAM LLC - BFS#2 (FLUSHING A) | FLUSHING, Belmont, OH | Pass | State |
| 2026-06-08 | BLUE RACER MIDSTREAM LLC - BFS#2 (FLUSHING A) | FLUSHING, Belmont, OH | Pass | State |
| 2026-06-05 | HILCORP ENERGY - ELK RUN BAKER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-06-05 | HILCORP ENERGY - ELK RUN BAKER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-06-05 | HILCORP ENERGY - ELK RUN BAKER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-06-05 | ROLLAND PAD 952787 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-05 | ROLLAND PAD 952787 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-05 | ROLLAND PAD 952787 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-06-04 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-06-04 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-06-03 | EOG RESOURCES, INC. - WILLIAMS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-06-03 | EOG RESOURCES, INC. - WILLIAMS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-06-03 | EOG RESOURCES, INC. - WILLIAMS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
| 2026-06-03 | JOHNS MANVILLE / PLANT #01 - WTV1 | WATERVILLE, Lucas, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.