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 |
|---|---|---|---|---|
| 2026-06-24 | OREGON CLEAN ENERGY CENTER | OREGON, Lucas, OH | Pass | State |
| 2026-06-24 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-06-24 | APPALACHIAN POWER CO, DRESDEN PLANT | DRESDEN, Muskingum, OH | Pass | State |
| 2026-06-24 | ENLINK MIDSTREAM SERVICES LLC / SAPPHIRE COMPRESSOR STATION | CALUMET, Canadian, OK | Pending | State |
| 2026-06-24 | COLUMBIA GAS TRANS CORP/DONEGAL COMP STA | WEST ALEXANDER, Washington, PA | Pass | State |
| 2026-06-24 | SOUTHWESTERN ENERGY CO/RACINE 5H | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-06-24 | RESONAC GRAPHITE AMERICA INC — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Pending | State |
| 2026-06-24 | POET BIOREFINING - MITCHELL LLC | MITCHELL, Davison, SD | Pass | State |
| 2026-06-24 | AQUATIC | LANCASTER, Dallas, TX | Fail | State |
| 2026-06-24 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-06-24 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-06-24 | MOLSON COORS BEVERAGE COMPANY USA LLC | ELKTON, Rockingham, VA | Pass | State |
| 2026-06-24 | HYDRITE CHEMICAL CO. — high-priority violation on file | COTTAGE GROVE, Dane, WI | N/A | State |
| 2026-06-24 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2026-06-24 | WPL - EDGEWATER GENERATING STATION | SHEBOYGAN, Taylor, WI | Pass | State |
| 2026-06-24 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-24 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-24 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-24 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-24 | HANSEN LAKE COMPRESSOR STATION (WILLIAMS FIELD SERVICES CO.) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-23 | PETRO STAR, INC. / PETRO STAR VALDEZ REFINERY — high-priority violation on file | VALDEZ, Valdez-Cordova (CA), AK | Pass | State |
| 2026-06-23 | PETRO STAR, INC. / PETRO STAR VALDEZ REFINERY — high-priority violation on file | VALDEZ, Valdez-Cordova (CA), AK | Pass | State |
| 2026-06-23 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-23 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-23 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-23 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-23 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-06-23 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-06-23 | CONSTELLIUM — high-priority violation on file | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-06-23 | SOUTHERN NATURAL GAS | SELMA, Dallas, AL | Pass | State |
| 2026-06-23 | INDORAMA VENTURES XYLENES & PTA LLC | DECATUR, Morgan, AL | Pass | State |
| 2026-06-23 | QUIKRETE CONSTRUCTION MATERIALS, LLC — high-priority violation on file | CALERA, Shelby, AL | Pass | State |
| 2026-06-23 | QUIKRETE CONSTRUCTION MATERIALS, LLC — high-priority violation on file | CALERA, Shelby, AL | Pass | State |
| 2026-06-23 | QUIKRETE CONSTRUCTION MATERIALS, LLC — high-priority violation on file | CALERA, Shelby, AL | Pass | State |
| 2026-06-23 | ENABLE MRT, LLC - GLENDALE COMPRESSOR STATION | STAR CITY, Lincoln, AR | Pass | State |
| 2026-06-23 | WHEATLAND TUBE, LLC. | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-06-23 | DCP OPERATING CO - ROCKY TURBINE CS | KERSEY 8.6 MI. NE OF, Weld, CO | Pass | State |
| 2026-06-23 | DCP OPERATING CO - ROCKY TURBINE CS | KERSEY 8.6 MI. NE OF, Weld, CO | Pass | State |
| 2026-06-23 | U S NAVAL SUBMARINE BASE — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2026-06-23 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-23 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-23 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-23 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-23 | INTERFOR U.S. INC. - BAXLEY SAWMILL | BAXLEY, Appling, GA | Pass | State |
| 2026-06-23 | INTERFOR U.S. INC. - BAXLEY SAWMILL | BAXLEY, Appling, GA | Pass | State |
| 2026-06-23 | MARINE CORPS LOGISTICS BASE | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-23 | MARINE CORPS LOGISTICS BASE | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-23 | MARINE CORPS LOGISTICS BASE | ALBANY, Dougherty, GA | Pass | State |
| 2026-06-23 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-06-23 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-06-23 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-06-23 | GA POWER CO PLT MCINTOSH | RINCON, Effingham, GA | Pass | State |
| 2026-06-23 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-23 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-23 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-23 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-23 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-23 | MARSHALL MUNICIPAL UTILITIES | MARSHALL, Clark, IL | Pass | State |
| 2026-06-23 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-23 | VECTOR PIPELINE | ELWOOD, Will, IL | Pass | State |
| 2026-06-23 | PADGETT INCORPORATED | NEW ALBANY, Floyd, IN | Pass | State |
| 2026-06-23 | PADGETT INCORPORATED | NEW ALBANY, Floyd, IN | Pass | State |
| 2026-06-23 | PADGETT INCORPORATED | NEW ALBANY, Floyd, IN | Pass | State |
| 2026-06-23 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-23 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-23 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-23 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.