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 |
|---|---|---|---|---|
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - SHEPORGI GRN HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - CLUB SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - CLUB SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-03-24 | ASCENT RESOURCES - UTICA LLC - CLUB SMF JF | ADENA, Jefferson, OH | Pass | State |
| 2026-03-24 | RANDALL PAD 952760 | SARDIS, Monroe, OH | Pass | State |
| 2026-03-24 | RANDALL PAD 952760 | SARDIS, Monroe, OH | Pass | State |
| 2026-03-24 | RANDALL PAD 952760 | SARDIS, Monroe, OH | Pass | State |
| 2026-03-24 | P AND K STONE LLC / MILL CREEK QUARRY — high-priority violation on file | MILL CREEK, Johnston, OK | Pass | State |
| 2026-03-24 | GEORGIA PACIFIC MUSKOGEE LLC / MUSKOGEE MILL | MUSKOGEE, Muskogee, OK | Pass | State |
| 2026-03-24 | TRANSCONTINENTAL GAS/BEAR CREEK STA 515 | BEAR CREEK, Luzerne, PA | Pass | State |
| 2026-03-24 | MARKWEST LIBERTY MIDSTREAM/BAKER COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2026-03-24 | ALGONQUIN GAS TRANSMISSION LINE | BURRILLVILLE, TOWN OF, Providence, RI | Pass | State |
| 2026-03-24 | CRANSTON WPCF | CRANSTON, Providence, RI | Pass | State |
| 2026-03-24 | RESONAC GRAPHITE AMERICA INC — high-priority violation on file | RIDGEVILLE, Dorchester, SC | Pass | State |
| 2026-03-24 | 48FORTY SOLUTIONS - GRAY COURT FACILITY — high-priority violation on file | GRAY COURT, Laurens, SC | Fail | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | WEST KARNES CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2026-03-24 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-03-24 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-03-24 | PACIFICORP HUNTINGTON | HUNTINGTON, Emery, UT | Pass | State |
| 2026-03-24 | NIPPON DYNAWAVE PACKAGING COMPANY LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-24 | APPALACHIA MIDSTREAM SERVICES, L.L.C., RIDGELINE STATION | CAMERON, Marshall, WV | Pass | State |
| 2026-03-24 | COLUMBIA GAS TRANSMISSION, LLC, SENECA | SENECA ROCKS, Pendleton, WV | Pass | State |
| 2026-03-24 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-24 | ECHO SPRINGS GAS PLANT (WILLIAMS FIELD SERVICES) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-03-24 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-03-24 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-03-24 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-03-23 | GULFSTREAM NATURAL GAS SYSTEM LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-23 | GULFSTREAM NATURAL GAS SYSTEM LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-23 | GULFSTREAM NATURAL GAS SYSTEM LLC | CODEN, Mobile, AL | Pass | State |
| 2026-03-23 | EXTRACTION OIL & GAS - FRYE NORTH | WINDSOR, Weld, CO | Pass | State |
| 2026-03-23 | EXTRACTION OIL & GAS - FRYE NORTH | WINDSOR, Weld, CO | Pass | State |
| 2026-03-23 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-03-23 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-23 | ROCHESTER METAL PRODUCTS CORPORATION — high-priority violation on file | ROCHESTER, Fulton, IN | Pass | State |
| 2026-03-23 | DTE GAS COMPANY - MILFORD COMPRESSOR STATION | MILFORD, Oakland, MI | Pass | State |
| 2026-03-23 | DTE GAS COMPANY - MILFORD COMPRESSOR STATION | MILFORD, Oakland, MI | Pass | State |
| 2026-03-23 | CONSUMERS ENERGY - OVERISEL COMPRESSOR STATION | HAMILTON, Allegan, MI | Pass | State |
| 2026-03-23 | CORTEVA AGRISCIENCE LLC | MIDLAND, Midland, MI | Pass | State |
| 2026-03-23 | GREEN PLAINS WOOD RIVER LLC — high-priority violation on file | WOOD RIVER, Hall, NE | Pass | State |
| 2026-03-23 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-23 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-23 | ALLEY CAT 17 CTB 4 | MALAGA, Lea, NM | Pass | State |
| 2026-03-23 | ALLEY CAT 17 CTB 4 | MALAGA, Lea, NM | Pass | State |
| 2026-03-23 | PAUL FLOWERS TB | MONUMENT, Lea, NM | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | HANOVERTON COMPRESSOR STATION | HANOVERTON, Columbiana, OH | Pass | State |
| 2026-03-23 | PINE RUN MIDSTREAM LLC/TROUT COMP STA | WORTHINGTON, Armstrong, PA | Pass | State |
| 2026-03-23 | VICINITY ENERGY EDISON/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-03-23 | BELMARK INC - PLANT 3 | DE PERE, Brown, WI | Pass | State |
| 2026-03-23 | COLUMBIA GAS TRANSMISSION, LLC, SENECA | SENECA ROCKS, Pendleton, WV | Pass | State |
| 2026-03-22 | BOA 34 CTB 2 | EUNICE, Lea, NM | Pass | State |
| 2026-03-21 | BOA 34 CTB 2 | EUNICE, Lea, NM | Pass | State |
| 2026-03-21 | BOA 34 CTB 2 | EUNICE, Lea, NM | Pass | State |
| 2026-03-21 | BOA 34 CTB 2 | EUNICE, Lea, NM | Pass | State |
| 2026-03-20 | TESORO REFINING AND MARKETING CO, LLC | CARSON, Los Angeles, CA | Pass | Local |
| 2026-03-20 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-03-20 | SIGECO - FB CULLEY GENERATING STATION | NEWBURGH, Warrick, IN | Pass | State |
| 2026-03-20 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-03-20 | DTE GAS COMPANY - BELLE RIVER MILLS COMPRESSOR STATION | CHINA, St. Clair, MI | Pass | State |
| 2026-03-20 | WESTWOOD SOLUTIONS LLC | OMAHA, Douglas, NE | Pass | State |
| 2026-03-20 | WESTWOOD SOLUTIONS LLC | OMAHA, Douglas, NE | Pass | State |
| 2026-03-20 | WEAVER BIG BURRO BATTERY | RIVERSIDE, Eddy, NM | Pass | State |
| 2026-03-20 | ALAMO COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-20 | GHOST COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | ROVER PIPELINE - MAINLINE CS1 | SHERRODSVILLE, Carroll, OH | Pass | State |
| 2026-03-20 | DARLING INGREDIENTS INC. (DBA BAKERY FEEDS) | NORTH BALTIMORE, Wood, OH | Pass | State |
| 2026-03-20 | DARLING INGREDIENTS INC. (DBA BAKERY FEEDS) | NORTH BALTIMORE, Wood, OH | Pass | State |
| 2026-03-20 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-03-20 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-03-20 | HILCORP ENERGY CO/PULASKI WHITING CTL FAC — high-priority violation on file | EDINBURG, Lawrence, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.