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 |
|---|---|---|---|---|
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
| 2025-12-10 | LIMESTONE RNG HIGH BTU FACILITY — high-priority violation on file | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-12-10 | LIMESTONE RNG HIGH BTU FACILITY — high-priority violation on file | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-12-10 | LIMESTONE RNG HIGH BTU FACILITY — high-priority violation on file | LOWELLVILLE, Mahoning, OH | Pass | State |
| 2025-12-10 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2025-12-10 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - COLLINS WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - COLLINS WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - COLLINS WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - ARCHIE WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - ARCHIE WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - ARCHIE WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - CROWELL WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - CROWELL WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-10 | ASCENT RESOURCES - UTICA LLC - CROWELL WYN JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-12-09 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2025-12-09 | ASCENT RESOURCES - UTICA LLC - FALDOWSKI SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-09 | ASCENT RESOURCES - UTICA LLC - FALDOWSKI SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-09 | ASCENT RESOURCES - UTICA LLC - FALDOWSKI SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-09 | ASCENT RESOURCES - UTICA LLC - LORI SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-09 | ASCENT RESOURCES - UTICA LLC - LORI SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-09 | ASCENT RESOURCES - UTICA LLC - LORI SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - COLEMAN WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - COLEMAN WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - COLEMAN WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-12-08 | GULFPORT APPALACHIA, LLC - BOY SCOUT WELL PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-12-08 | GULFPORT APPALACHIA, LLC - BOY SCOUT WELL PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-12-08 | GULFPORT APPALACHIA, LLC - BOY SCOUT WELL PAD | TIPPECANOE, Harrison, OH | Pass | State |
| 2025-12-05 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-12-05 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-12-05 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2025-12-04 | FREEPOINT ECO-SYSTEMS HEBRON | HEBRON, Licking, OH | Fail | State |
| 2025-12-04 | PLY GEM — high-priority violation on file | SIDNEY, Shelby, OH | Pass | State |
| 2025-12-04 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-12-04 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-12-03 | XTO ENERGY INC - MILLER UNIT PAD | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-03 | XTO ENERGY INC - MILLER UNIT PAD | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-03 | XTO ENERGY INC - MILLER UNIT PAD | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES - UTICA, LLC - HELLER | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES - UTICA, LLC - HELLER | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES - UTICA, LLC - HELLER | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES- UTICA, LLC - PAVICH | WAYNE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES- UTICA, LLC - PAVICH | WAYNE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | ASCENT RESOURCES- UTICA, LLC - PAVICH | WAYNE, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-02 | CARDINAL POWER PLANT (CARDINAL OPERATING COMPANY) | BRILLIANT, Jefferson, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-02 | VALICOR ENVIRONMENTAL SERVICES, LLC — high-priority violation on file | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.