EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-07-22 | ENTERPRISE GAS PROC - MEEKER GAS PLANT — high-priority violation on file | MEEKER 21.1 MI. W OF, Rio Blanco, CO | Fail | State |
| 2026-07-22 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-07-22 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-22 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-22 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-07-22 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-07-22 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-07-22 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-07-22 | STAKER PARSON COMPANY DBA IDAHO MATERIALS & CONSTRUCTION 00322 | NAMPA, Canyon, ID | Pending | State |
| 2026-07-22 | CLARIOS LLC | GENEVA, Kane, IL | Fail | State |
| 2026-07-22 | METAL TECHNOLOGIES AUBURN LLC — high-priority violation on file | AUBURN, DeKalb, IN | Pass | State |
| 2026-07-22 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-22 | REAL ALLOY RECYCLING, LLC — high-priority violation on file | COLDWATER, Branch, MI | Pass | State |
| 2026-07-22 | WILBARA, LLC | WILMINGTON, New Hanover, NC | Pending | State |
| 2026-07-22 | BURGESS BIOPOWER | BERLIN, Coos, NH | Pass | State |
| 2026-07-22 | CROWN CORK & SEAL — high-priority violation on file | TOLEDO, Lucas, OH | Fail | State |
| 2026-07-22 | CROWN CORK & SEAL — high-priority violation on file | TOLEDO, Lucas, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - OLIVER CLR BL | MARTINS FERRY, Belmont, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - OLIVER CLR BL | MARTINS FERRY, Belmont, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - OLIVER CLR BL | MARTINS FERRY, Belmont, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - RECTOR MTP JF WELLPAD | ADENA, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - RECTOR MTP JF WELLPAD | ADENA, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - RECTOR MTP JF WELLPAD | ADENA, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-22 | ASCENT RESOURCES - UTICA LLC - ZEDS MTP JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-22 | GENTEX CORP/SIMPSON PROT CLOTHING | SIMPSON, Lackawanna, PA | Pass | State |
| 2026-07-22 | TEXAS EASTERN TRANS LP/BECHTELSVILLE | BECHTELSVILLE, Berks, PA | Pass | State |
| 2026-07-22 | UGI MORAINE EAST GATHERING LLC/RENICK COMP STA | WEST SUNBURY, Butler, PA | Pass | State |
| 2026-07-22 | CABOT OIL & GAS CORP/JEFFERS FARMS PAD 5 | GIBSON, Susquehanna, PA | Pass | State |
| 2026-07-22 | KING, D. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-07-22 | WOONSOCKET WASTEWATER TREATMENT FACILITY | WOONSOCKET, Providence, RI | Pending | U.S. EPA |
| 2026-07-22 | 48FORTY SOLUTIONS - GRAY COURT FACILITY — high-priority violation on file | GRAY COURT, Laurens, SC | Pass | State |
| 2026-07-22 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-22 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-22 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-22 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-07-22 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-07-22 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-07-22 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-07-21 | APACHE NITROGEN PRODUCTS INC — high-priority violation on file | SAINT DAVID, Cochise, AZ | Pass | State |
| 2026-07-21 | MESQUITE GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-07-21 | AMERICAN GYPSUM COMPANY | GYPSUM, Eagle, CO | Pass | State |
| 2026-07-21 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | N/A | State |
| 2026-07-21 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-07-21 | SUNCORE CONSTRUCTION & MATERIALS 00721 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-07-21 | MIDWEST MATERIAL SUPPLY LLC — high-priority violation on file | MURPHYSBORO, Jackson, IL | Pass | State |
| 2026-07-21 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-07-21 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-21 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-21 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-21 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-21 | PIEDMONT NATURAL GAS - CONCORD COMPRESSOR STATION | CONCORD, Cabarrus, NC | Pending | State |
| 2026-07-21 | ARAUCO BISCOE | BISCOE, Montgomery, NC | Pending | State |
| 2026-07-21 | AMRIZE SOUTHWEST, INC. — high-priority violation on file | SLOAN, Clark, NV | Pass | Local |
| 2026-07-21 | AMRIZE SOUTHWEST, INC. — high-priority violation on file | SLOAN, Clark, NV | Pass | Local |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - PROSSER E UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | ASCENT RESOURCES - UTICA LLC - BANNOCK UNN BL | LAFFERTY, Belmont, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - BROOKFIELD CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - BROOKFIELD CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-07-21 | EOG RESOURCES, INC. - BROOKFIELD CTB | CUMBERLAND, Guernsey, OH | Pass | State |
| 2026-07-21 | COLUMBIA PIPELINE GROUP-SUMMERFIELD | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-07-21 | COLUMBIA PIPELINE GROUP-SUMMERFIELD | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-07-21 | MARKWEST LIBERTY BLUESTONE LLC/ROYAL OAK COMP STA | EVANS CITY, Butler, PA | Pass | State |
| 2026-07-21 | KING, D. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pending | State |
| 2026-07-21 | WOOD, E. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-21 | KING ASPHALT INC - WALHALLA ASPHALT PLANT | WALHALLA, Oconee, SC | Pass | State |
| 2026-07-21 | USB TENNESSEE LLC - GLEASON | GLEASON, Weakley, TN | Pending | State |
| 2026-07-21 | GUARDIAN INDUSTRIES | CORSICANA, Navarro, TX | Pass | State |
| 2026-07-21 | CHICO GAS PLANT | CHICO, Wise, TX | Pass | State |
| 2026-07-21 | US NAVY - NORFOLK NAVAL SHIPYARD | PORTSMOUTH, Portsmouth (city), VA | Pending | State |
| 2026-07-21 | BADGER STATE ETHANOL, INC. — high-priority violation on file | MONROE, Green, WI | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.