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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.