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 |
|---|---|---|---|---|
| 2026-02-05 | GENERAL MOTORS LLC | WENTZVILLE, St. Charles, MO | N/A | State |
| 2026-02-05 | GENERAL MOTORS LLC | WENTZVILLE, St. Charles, MO | N/A | State |
| 2026-02-05 | AG PROCESSING INC — high-priority violation on file | DAVID CITY, Butler, NE | Fail | State |
| 2026-02-05 | HACKBERRY COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-02-05 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-05 | RAMBO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-05 | HORNED FROG COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-05 | PORT JEFFERSON ENERGY CENTER | PORT JEFFERSON, Suffolk, NY | Pass | State |
| 2026-02-05 | EOG RESOURCES, INC. - WIANDT 12-13-6 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-02-05 | MIAMI FORT POWER COMPANY LLC | NORTH BEND, Hamilton, OH | Pass | State |
| 2026-02-05 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2026-02-05 | EQM GATHERING OPCO LLC/JUPITER COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2026-02-05 | LAUREL MTN MIDSTREAM OPR LLC/SHAMROCK COMP STA — high-priority violation on file | SALEM, Fayette, PA | Pass | State |
| 2026-02-05 | EXPAND OPERATING LLC/GU-G SOUTH WELL PAD | WYALUSING, Bradford, PA | Pass | State |
| 2026-02-05 | RANGE RESOURCES APPALACHIA LLC/SGL 075A 12682 | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-02-05 | SUSQ HUCKLEBERRY PAD C | ROARING BRANCH, Tioga, PA | Pass | State |
| 2026-02-05 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2026-02-05 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-02-05 | TENNESSEE VALLEY AUTHORITY - GALLATIN FOSSIL PLANT | GALLATIN, Sumner, TN | Pass | State |
| 2026-02-05 | DECATUR COMPRESSOR STATION | DECATUR, Wise, TX | Pass | State |
| 2026-02-05 | SLIDELL BOOSTER STATION | SLIDELL, Wise, TX | Pass | State |
| 2026-02-05 | JMU - JAMES MADISON UNIVERSITY | HARRISONBURG, Harrisonburg (city), VA | Pass | State |
| 2026-02-05 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-02-05 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-02-05 | CONSTELLIUM ROLLED PRODUCTS RAVENSWOOD, LLC, RAVENSWOOD | RAVENSWOOD, Jackson, WV | Pass | State |
| 2026-02-05 | APPALACHIA MIDSTREAM SERVICES, L.L.C., MILLER STATION | BANNEN, Marshall, WV | Pass | State |
| 2026-02-05 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-05 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-05 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-05 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-04 | FREEBIRD GAS STORAGE | DETROIT, Lamar, AL | Pass | State |
| 2026-02-04 | INEOS PHENOL | THEODORE, Mobile, AL | Pass | State |
| 2026-02-04 | INEOS PHENOL | THEODORE, Mobile, AL | Pass | State |
| 2026-02-04 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2026-02-04 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-02-04 | ENTERGY ARKANSAS, LLC - INDEPENDENCE PLANT | NEWARK, Independence, AR | Pass | State |
| 2026-02-04 | DESOTO GATHERING COMPANY, LLC - SOUTHWEST GREER LAKE CPF-5 | CLINTON, Van Buren, AR | Pass | State |
| 2026-02-04 | DESOTO GATHERING COMPANY, LLC - SOUTHWEST GREER LAKE CPF-5 | CLINTON, Van Buren, AR | Pass | State |
| 2026-02-04 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2026-02-04 | CIRCLE K TERMINAL | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-02-04 | MPLX TERMINALS LLC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-02-04 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-04 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-04 | FLORIDA POWER & LIGHT COMPANY | OKEECHOBEE, Okeechobee, FL | Pass | State |
| 2026-02-04 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-04 | ELBA LIQUEFACTION COMPANY, LLC - ELBA LIQUEFACTION TERMINAL | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-04 | ELBA LIQUEFACTION COMPANY, LLC - ELBA LIQUEFACTION TERMINAL | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-04 | ELBA LIQUEFACTION COMPANY, LLC - ELBA LIQUEFACTION TERMINAL | SAVANNAH, Chatham, GA | Pass | State |
| 2026-02-04 | GIW INDUSTRIES, INC. | GROVETOWN, Columbia, GA | Pass | State |
| 2026-02-04 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-02-04 | WR GRACE | CHICAGO, Cook, IL | Pass | State |
| 2026-02-04 | HAYNES INTERNATIONAL INC — high-priority violation on file | KOKOMO, Howard, IN | Pass | State |
| 2026-02-04 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-02-04 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-02-04 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-02-04 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-02-04 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-02-04 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-02-04 | TAMPA PORT SERVICES LLC - FAUSTINA PLANT | ST. JAMES, St. James, LA | Pass | State |
| 2026-02-04 | STERICYCLE INC - STERICYCLE SPRINGHILL FACILITY | SAREPTA, Webster, LA | Pass | State |
| 2026-02-04 | DISTRICT ENERGY ST PAUL/ST PAUL COGENERATION L | SAINT PAUL, Ramsey, MN | Pass | State |
| 2026-02-04 | CARDINAL PIPELINE COMPANY, LLC - COMPRESSOR STATION 161 | BROWNS SUMMIT, Guilford, NC | Pending | State |
| 2026-02-04 | UNIVERSAL LEAF NORTH AMERICA, INC. | NASHVILLE, Nash, NC | Pass | State |
| 2026-02-04 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-04 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-04 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-04 | RANA SALADA E PAD | LOVING, Eddy, NM | Pass | State |
| 2026-02-04 | TEXANA COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-04 | BIRDIE COMPRESSOR STATION | ATOKA, Eddy, NM | Pass | State |
| 2026-02-04 | BIRDIE COMPRESSOR STATION | ATOKA, Eddy, NM | Pass | State |
| 2026-02-04 | CAVERN COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-02-04 | ANCHOR HOCKING, LLC | LANCASTER, Fairfield, OH | Pass | State |
| 2026-02-04 | EOG RESOURCES, INC. - BOWLING 23-16-6 PAD | MALVERN, Carroll, OH | Pass | State |
| 2026-02-04 | EOG RESOURCES, INC. - BOWLING 23-16-6 PAD | MALVERN, Carroll, OH | Pass | State |
| 2026-02-04 | EOG RESOURCES, INC. - BOWLING 23-16-6 PAD | MALVERN, Carroll, OH | Pass | State |
| 2026-02-04 | CITY OF AKRON STEAM GENERATING | AKRON, Summit, OH | Pass | State |
| 2026-02-04 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-02-04 | UNIVERSITY OF OREGON | EUGENE, Lane, OR | Pass | Local |
| 2026-02-04 | REPSOL OIL & GAS USA LLC/EDSELL COMP STA | LE RAYSVILLE, Bradford, PA | Pass | State |
| 2026-02-04 | US STEEL CORP/IRVIN PLT | WEST MIFFLIN, Allegheny, PA | Pass | Local |
| 2026-02-04 | TEMPLE UNIV/ MAIN CAMPUS — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Fail | Local |
| 2026-02-04 | TEMPLE UNIV/ MAIN CAMPUS — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Fail | Local |
| 2026-02-04 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-02-04 | PACIFICORP CURRANT CREEK POWER PLANT | MONA, Juab, UT | Pass | State |
| 2026-02-04 | NEXPERA LLC | NORTH CHESTERFIELD, Chesterfield, VA | Pass | State |
| 2026-02-04 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-02-04 | SUPERIOR REFINING COMPANY LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2026-02-04 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-02-04 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-04 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-04 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-04 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-04 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-04 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-04 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-04 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-03 | PRUET PRODUCTION COMPANY | ATMORE, Escambia, AL | Pass | State |
| 2026-02-03 | FREEBIRD GAS STORAGE | DETROIT, Lamar, AL | Pass | State |
| 2026-02-03 | FREEBIRD GAS STORAGE | DETROIT, Lamar, AL | Pass | State |
| 2026-02-03 | INEOS PHENOL | THEODORE, Mobile, AL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.