EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 15,218Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,887
- California 1,849
- Indiana 1,315
- New Mexico 1,112
- Florida 1,099
- Wyoming 903
- Georgia 693
- Pennsylvania 636
- Arkansas 481
- Alabama 445
- Missouri 433
- Texas 337
- Mississippi 332
- Michigan 270
- Colorado 255
- Iowa 250
- North Carolina 239
- Illinois 224
- Wisconsin 190
- South Carolina 165
- Kansas 151
- West Virginia 140
- Virginia 119
- Montana 115
- Idaho 114
- Utah 109
- Minnesota 108
- Delaware 107
- Tennessee 106
- Kentucky 97
- Connecticut 92
- Washington 87
- Arizona 83
- Massachusetts 78
- Nebraska 74
- North Dakota 72
- New York 67
- Nevada 61
- Alaska 47
- New Hampshire 38
- South Dakota 36
- Louisiana 35
- District of Columbia 30
- Maryland 29
- Oregon 28
- Hawaii 24
- Rhode Island 19
- Maine 16
- Oklahoma 15
- Puerto Rico 6
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-26 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-08-26 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-08-26 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-08-26 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-26 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-26 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-26 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-26 | GRANITE CITY WORKS OF UNITED STATES STEEL CORP — high-priority violation on file | GRANITE CITY, Madison, IL | Pass | State |
| 2026-08-26 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2026-08-26 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2026-08-26 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2026-08-26 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2026-08-26 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-08-26 | GENERAL MOTORS LLC DETROIT-HAMTRAMCK ASSEMBLY | DETROIT, Wayne, MI | Pass | State |
| 2026-08-26 | C&C ENERGY LLC — high-priority violation on file | MARSHALL, Calhoun, MI | Pass | State |
| 2026-08-26 | EGGER - LEXINGTON PARTICLEBOARD PLANT — high-priority violation on file | LINWOOD, Davidson, NC | Pending | State |
| 2026-08-26 | PSNC DBA ENBRIDGE GAS - SILVER CREEK ROAD COMPRESSOR STATION | MILL SPRING, Polk, NC | Pending | State |
| 2026-08-26 | DARTMOUTH PRINTING COMPANY | HANOVER, Grafton, NH | Pending | State |
| 2026-08-26 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-26 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-26 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-26 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-26 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-26 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-08-26 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-08-26 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-08-26 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-08-26 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-08-26 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-08-26 | MARKWEST LAREW COMPRESSOR STATION | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-08-26 | TENNESSEE GAS PIPELINE CO/313 COUDERSPORT | COUDERSPORT, Potter, PA | Pass | State |
| 2026-08-26 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2026-08-26 | EASTERN GAS TRANS & STORAGE/PUNXSUTAWNEY | PUNXSUTAWNEY, Jefferson, PA | Pass | State |
| 2026-08-26 | ENERGY TRANSFER MKT & TERM LP/ALTOONA TERMINAL | ALTOONA, Blair, PA | Pass | State |
| 2026-08-26 | HM SOUTHEAST CEMENT LLC | HARLEYVILLE, Dorchester, SC | Pass | State |
| 2026-08-26 | BRIDGEPORT GAS PLANT | BRIDGEPORT, Wise, TX | Pass | State |
| 2026-08-26 | BRIDGEPORT GAS PLANT | BRIDGEPORT, Wise, TX | Pass | State |
| 2026-08-26 | CENTRAL VALLEY WATER RECLAMATION | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2026-08-26 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-26 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-26 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-26 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-08-26 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | HALLIBURTON ENERGY SERVICES, INC. - MAGNET COVE | MALVERN, Hot Spring, AR | Pass | State |
| 2026-08-25 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-25 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-25 | SAN JOAQUIN REFINING CO — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-08-25 | MIDDLESEX HOSPITAL | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2026-08-25 | O & G INDUSTRIES, INC | MILFORD, New Haven, CT | Pass | State |
| 2026-08-25 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-08-25 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-08-25 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-08-25 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-08-25 | CITGO PETROLEUM CORPORATION | TAMPA, Hillsborough, FL | Pass | State |
| 2026-08-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-25 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | LOXAHATCHEE, Palm Beach, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Pass | State |
| 2026-08-25 | APAC - ATLANTIC INC - SAVANNAH ASPHALT PLANT | GARDEN CITY, Chatham, GA | Pass | State |
| 2026-08-25 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-08-25 | HOLCIM NER INC | WATERTOWN, Middlesex, MA | Pending | State |
| 2026-08-25 | HOLCIM NER INC | WATERTOWN, Middlesex, MA | Pending | State |
| 2026-08-25 | ALPHA RIDGE LANDFILL | MARRIOTTSVILLE, Howard, MD | Pending | State |
| 2026-08-25 | GREDE IRON MOUNTAIN, LLC — high-priority violation on file | KINGSFORD, Dickinson, MI | Pass | State |
| 2026-08-25 | GRAYMONT WESTERN LIME INC — high-priority violation on file | GULLIVER, Schoolcraft, MI | Pass | State |
| 2026-08-25 | DTE GAS COMPANY - WILLOW RUN COMPRESSOR STATION | YPSILANTI, Washtenaw, MI | Pass | State |
| 2026-08-25 | GLENWOOD COMBUSTION TURBINE FACILITY | GLENWOOD LANDING, Nassau, NY | Pass | State |
| 2026-08-25 | ISLIP MACARTHUR RESOURCE RECOVERY FACILITY | RONKONKOMA, Suffolk, NY | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | FUCHS PAD 952477 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-08-25 | ENERGY TRANSFER- ROVER PPLN - SENECA COMPRESSOR STATION | SUMMERFIELD, Noble, OH | 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.