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 |
|---|---|---|---|---|
| 2026-03-25 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-25 | PLCP, L.P. | STEAMBOAT ROCK, Hardin, IA | Pass | State |
| 2026-03-25 | CLEARWATER PAPER CORP-PPD | LEWISTON, Nez Perce, ID | Pass | State |
| 2026-03-25 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-03-25 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-25 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-25 | BCI SOLUTIONS INCORPORATED | BREMEN, Marshall, IN | Pass | State |
| 2026-03-25 | CLEVELAND CLIFFS NEW CARLISLE LLC — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-03-25 | CLEVELAND CLIFFS NEW CARLISLE LLC — high-priority violation on file | NEW CARLISLE, St. Joseph, IN | Pass | State |
| 2026-03-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-03-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-03-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-03-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-03-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-03-25 | BILLERUD ESCANABA LLC | ESCANABA, Delta, MI | Pass | State |
| 2026-03-25 | THE DOW CHEMICAL COMPANY U.S.A., MIDLAND — high-priority violation on file | MIDLAND, Midland, MI | Pass | State |
| 2026-03-25 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2026-03-25 | AL-CORN CLEAN FUEL LLC | CLAREMONT, Dodge, MN | Pass | State |
| 2026-03-25 | MINNESOTA POWER - HIBBARD RENEWABLE ENERGY CENTER | DULUTH, St. Louis, MN | Pass | State |
| 2026-03-25 | LAMAR CITY ELECTRICAL GENERATION | LAMAR, Barton, MO | Pass | State |
| 2026-03-25 | LAMAR CITY ELECTRICAL GENERATION | LAMAR, Barton, MO | Pass | State |
| 2026-03-25 | LAMAR CITY ELECTRICAL GENERATION | LAMAR, Barton, MO | Pass | State |
| 2026-03-25 | LAMAR CITY ELECTRICAL GENERATION | LAMAR, Barton, MO | Pass | State |
| 2026-03-25 | CENTRAL MISSOURI RENEWABLE NATURAL GAS LLC | SEDALIA, Pettis, MO | Pass | State |
| 2026-03-25 | MISSISSIPPI LIME COMPANY | SAINTE GENEVIEVE, Ste. Genevieve, MO | Pass | State |
| 2026-03-25 | PRYSMIAN CABLES AND SYSTEMS USA, LLC — high-priority violation on file | CLAREMONT, Catawba, NC | Pass | State |
| 2026-03-25 | PRYSMIAN CABLES AND SYSTEMS USA, LLC — high-priority violation on file | CLAREMONT, Catawba, NC | Pass | State |
| 2026-03-25 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-25 | NORTH PEN COMPRESSOR STATION | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-25 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-03-25 | MULE 23 CTB 2 | MALAGA, Eddy, NM | Pass | State |
| 2026-03-25 | VICTORY COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-03-25 | WHITBY FED COM TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-03-25 | WHITBY FED COM TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-03-25 | ROCCO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-25 | ROCCO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-25 | HORNED FROG COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-25 | HORNED FROG COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-03-25 | COLD SNACK COMPRESSOR STATION | WHITES CITY, Lea, NM | Pass | State |
| 2026-03-25 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2026-03-25 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Fail | Local |
| 2026-03-25 | CROWN CORK & SEAL COMPANY INC | NICHOLS, Tioga, NY | Pass | State |
| 2026-03-25 | ASCENT RESOURCES- UTICA, LLC - KURTH | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES- UTICA, LLC - KURTH | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES- UTICA, LLC - KURTH | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - COFFIELD RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - COFFIELD RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - COFFIELD RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - VICTORIA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - VICTORIA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | ASCENT RESOURCES - UTICA LLC - VICTORIA ATH HR | CADIZ, Harrison, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | EASTERN GAS TRANSMISSION & STORAGE, INC MULLETT STATION | SWITZERLAND, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2026-03-25 | PURECYCLE OHIO, LLC. | IRONTON, Lawrence, OH | Pass | State |
| 2026-03-25 | GEORGIA PACIFIC MUSKOGEE LLC / MUSKOGEE MILL | MUSKOGEE, Muskogee, OK | Pass | State |
| 2026-03-25 | EASTERN GAS TRANS & STORAGE INC/SOUTH BEND COMP STA | SHELOCTA, Armstrong, PA | Pass | State |
| 2026-03-25 | ARMSTRONG CEMENT & SUPPLY/WINFIELD — high-priority violation on file | CABOT, Butler, PA | Pass | State |
| 2026-03-25 | POWERS, N. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-03-25 | WALDENBERGER, P. PAD 1 | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-03-25 | ALGONQUIN GAS TRANSMISSION LINE | BURRILLVILLE, TOWN OF, Providence, RI | Pass | State |
| 2026-03-25 | ARAUCO NORTH AMERICA INC — high-priority violation on file | BENNETTSVILLE, Marlboro, SC | Pending | State |
| 2026-03-25 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-03-25 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-03-25 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-03-25 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-03-25 | KINDER MORGAN LLC - MAIN GAS PLANT | ALTAMONT, Duchesne, UT | Pass | State |
| 2026-03-25 | PACIFICORP HUNTINGTON | HUNTINGTON, Emery, UT | Pass | State |
| 2026-03-25 | REWORLD ALEXANDRIA/ARLINGTON, LLC | ALEXANDRIA, Alexandria (city), VA | Pass | State |
| 2026-03-25 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2026-03-25 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.