EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-10-28 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-28 | POET BIOREFINING - MENLO, LLC | MENLO, Guthrie, IA | Pass | State |
| 2025-10-28 | AMSTED RAIL COMPANY, INC | KEOKUK, Lee, IA | Pass | State |
| 2025-10-28 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2025-10-28 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2025-10-28 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2025-10-28 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2025-10-28 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2025-10-28 | DUKE ENERGY INDIANA LLC EDWARDSPORT GENERATING STATION | EDWARDSPORT, Knox, IN | Pass | State |
| 2025-10-28 | ANR PIPELINE COMPANY ST JOHN COMPRESSOR STATION | SAINT JOHN, Lake, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-28 | BRICKCRAFT INC — high-priority violation on file | FARMERSBURG, Sullivan, IN | Pass | State |
| 2025-10-28 | BRICKCRAFT INC — high-priority violation on file | FARMERSBURG, Sullivan, IN | Pass | State |
| 2025-10-28 | WASTE NO ENERGY LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-28 | WASTE NO ENERGY LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-28 | WASTE NO ENERGY LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-28 | RIVER ROCK OPERATING - FIRESIDE STATION (AIR) | ALTOONA, Wilson, KS | Pass | State |
| 2025-10-28 | HYDRO ALUMINUM METALS USA LLC | HENDERSON, Henderson, KY | Pass | State |
| 2025-10-28 | TOYOTA MOTOR MANUFACTURING, KENTUCKY | GEORGETOWN (SCOTT), Scott, KY | Pending | State |
| 2025-10-28 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2025-10-28 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2025-10-28 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2025-10-28 | CONSTELLATION WEST MEDWAY LLC | MEDWAY, Norfolk, MA | Pending | State |
| 2025-10-28 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2025-10-28 | MICHIGAN SUGAR COMPANY-CARO FACTORY — high-priority violation on file | CARO, Tuscola, MI | Pass | State |
| 2025-10-28 | WEYERHAEUSER NR COMPANY | GRAYLING, Crawford, MI | Pass | State |
| 2025-10-28 | WEYERHAEUSER NR COMPANY | GRAYLING, Crawford, MI | Pass | State |
| 2025-10-28 | GREAT LAKES GAS - FARWELL COMPRESSOR STATION 12 | LAKE GEORGE, Clare, MI | Pass | State |
| 2025-10-28 | BREMBO NORTH AMERICA, INC. — high-priority violation on file | HOMER, Calhoun, MI | Pass | State |
| 2025-10-28 | RIVERSIDE CARBON SOLUTIONS - TURTLE LAKE CO2 | CHESTER TWP, Otsego, MI | Pass | State |
| 2025-10-28 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-10-28 | NORTHSHORE MINING CO - SILVER BAY | SILVER BAY, Lake, MN | Pass | State |
| 2025-10-28 | VALERO RENEWABLE FUELS CO LLC - WELCOME PLANT | WELCOME, Martin, MN | Pass | State |
| 2025-10-28 | SHAKOPEE MDEWAKANTON SIOUX COMMUNITY ORGANIC RECYCLING FACILITY | SHAKOPEE, Scott, MN | N/A | State |
| 2025-10-28 | DUININCK BROS INC - PORT PLANT 6 | PRINSBURG, Kandiyohi, MN | Fail | State |
| 2025-10-28 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-10-28 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-10-28 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-10-28 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-28 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-10-28 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-28 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-28 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-28 | FLAGSTONE FOODS, INC. -ROBERSONVILLE | ROBERSONVILLE, Martin, NC | Pass | State |
| 2025-10-28 | RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-28 | RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-28 | BLUE QUAIL COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-10-28 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-28 | NAILED IT B COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-28 | GAVILON TB | MONUMENT, Lea, NM | Pass | State |
| 2025-10-28 | OVER THE LINE COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-10-28 | KEYMARK CORP PLANT | MOHAWK, Montgomery, NY | Pass | State |
| 2025-10-28 | SHEEHAN ASPHALT PLANT POTSDAM | POTSDAM, St. Lawrence, NY | Fail | State |
| 2025-10-28 | EOG RESOURCES, INC. - SHC ENTERPRISES 32-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - SHC ENTERPRISES 32-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - SHC ENTERPRISES 32-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-10-28 | EOG RESOURCES, INC. - GUTHRIE HN FRA PAD | DEERSVILLE, Harrison, OH | Pass | State |
| 2025-10-28 | DCP OPERATING CO LP / WILD HOG BOOSTER STATION | BRADLEY, Grady, OK | Pass | State |
| 2025-10-28 | MERCK SHARP & DOHME LLC/WEST PT | WEST POINT, Montgomery, PA | Pass | State |
| 2025-10-28 | EQM GATHERING OPCO LLC/IO COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-10-28 | REPSOL OIL 7 GAS USA LLC/BENNET COMP STA | LERAYSVILLE, Bradford, PA | Pass | State |
| 2025-10-28 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | N/A | State |
| 2025-10-28 | CENTRAL VALLEY WATER RECLAMATION | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2025-10-28 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-28 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-28 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-28 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-10-28 | ATMUS FILTRATION INC. - NEILLSVILLE PLANT | NEILLSVILLE, Clark, WI | Pass | State |
| 2025-10-28 | ERGON - WEST VIRGINIA, INC., NEWELL | NEWELL, Hancock, WV | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-28 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.