EPA Air · stack tests by state and year
Air-emissions stack tests in Ohio, 2025
- 2,213Stack 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 2025; one facility can appear more than once, because this is a record of what happened rather than a list of places.
Counties in Ohio, 2025
- Monroe County 233
- Belmont County 210
- Lucas County 209
- Harrison County 199
- Carroll County 138
- Jefferson County 121
- Guernsey County 95
- Noble County 84
- Montgomery County 68
- Defiance County 65
- Franklin County 61
- Hamilton County 58
- Medina County 43
- Undetermined County 42
- Butler County 34
- Putnam County 34
- Stark County 33
- Lorain County 31
- Columbiana County 27
- Wood County 26
- Cuyahoga County 25
- Trumbull County 24
- Mahoning County 23
- Perry County 23
- Marion County 20
- Tuscarawas County 20
- Fairfield County 18
- Licking County 17
- Crawford County 16
- Greene County 15
- Union County 15
- Ashtabula County 14
- Darke County 12
- Washington County 12
- Williams County 12
- Allen County 11
- Wayne County 10
- Brown County 9
- Miami County 9
- Summit County 9
- Warren County 8
- Richland County 7
- Clark County 6
- Huron County 6
- Athens County 5
- Muskingum County 5
- Erie County 5
- Van Wert County 4
- Hancock County 4
- Delaware County 3
- Shelby County 3
- Portage County 3
- Coshocton County 3
- Lake County 3
- Jackson County 3
Ohio, other years
Air-emissions stack tests recorded in Ohio, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-30 | EMERSON BELLE OHI -UTICA PAD 1 952455 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-27 | CINCINNATI CHILDREN'S HOSPITAL MEDICAL CENTER | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-12-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-20 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | LSC COMMUNICATIONS BOOK, WILLARD | WILLARD, Huron, OH | Pass | State |
| 2025-12-18 | OSCO INC.-JACKSON DIVISION | JACKSON, Jackson, OH | Pass | State |
| 2025-12-18 | APEX LFG ENERGY, LLC | AMSTERDAM, Jefferson, OH | Pass | State |
| 2025-12-18 | APEX LFG ENERGY, LLC | AMSTERDAM, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-16 | PEPPERIDGE FARM INC. | WILLARD, Huron, OH | Fail | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
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Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in OH for 2025. It lists 2,213 stack tests recorded in 2025.