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 |
|---|---|---|---|---|
| 2025-10-10 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2025-10-09 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-10-09 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-10-09 | ARCOSA LW BR, LLC | LIVINGSTON, Sumter, AL | Pass | State |
| 2025-10-09 | ARCOSA LW BR, LLC | LIVINGSTON, Sumter, AL | Pass | State |
| 2025-10-09 | ARCOSA LW BR, LLC | LIVINGSTON, Sumter, AL | Pass | State |
| 2025-10-09 | DESOTO GATHERING COMPANY, LLC - HAMMERHEAD CPF-1 | JUDSONIA, White, AR | Pass | State |
| 2025-10-09 | DESOTO GATHERING COMPANY, LLC - HAMMERHEAD CPF-1 | JUDSONIA, White, AR | Pass | State |
| 2025-10-09 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-09 | DCP OPERATING CO - ROGGEN NGPP — high-priority violation on file | KEENESBURG 4.4 MI. E OF, Weld, CO | Fail | State |
| 2025-10-09 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2025-10-09 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2025-10-09 | EXTRACTION - WAKE EAST 32N PROD FACILITY | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-09 | CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) | ATLANTA, DeKalb, GA | Pass | State |
| 2025-10-09 | CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) | ATLANTA, DeKalb, GA | Pass | State |
| 2025-10-09 | CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC) | ATLANTA, DeKalb, GA | Pass | State |
| 2025-10-09 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2025-10-09 | MICROSOFT CORPORATION - WILLOW CREEK/GINGER EAST DATA | DES MOINES, Polk, IA | Fail | Local |
| 2025-10-09 | ILLINOIS POWER GENERATING CO | NEWTON, Jasper, IL | Pass | State |
| 2025-10-09 | LAKE FOREST HOSPITAL | LAKE FOREST, Lake, IL | Pass | State |
| 2025-10-09 | LAKE FOREST HOSPITAL | LAKE FOREST, Lake, IL | Pass | State |
| 2025-10-09 | LAKE FOREST HOSPITAL | LAKE FOREST, Lake, IL | Pass | State |
| 2025-10-09 | LAKE FOREST HOSPITAL | LAKE FOREST, Lake, IL | Pass | State |
| 2025-10-09 | MILAM RECYCLING AND DISPOSAL FACILITY | FAIRMONT CITY, St. Clair, IL | Pass | State |
| 2025-10-09 | MILAM RECYCLING AND DISPOSAL FACILITY | FAIRMONT CITY, St. Clair, IL | Pass | State |
| 2025-10-09 | MILAM RECYCLING AND DISPOSAL FACILITY | FAIRMONT CITY, St. Clair, IL | Pass | State |
| 2025-10-09 | PHEND & BROWN INC | LEESBURG, Kosciusko, IN | Pass | State |
| 2025-10-09 | PHEND & BROWN INC | LEESBURG, Kosciusko, IN | Pass | State |
| 2025-10-09 | PHEND & BROWN INC | LEESBURG, Kosciusko, IN | Pass | State |
| 2025-10-09 | PHEND & BROWN INC | LEESBURG, Kosciusko, IN | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-09 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-09 | WABASH VALLEY ASPHALT | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-10-09 | WABASH VALLEY ASPHALT | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-10-09 | WABASH VALLEY ASPHALT | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-10-09 | WABASH VALLEY ASPHALT | TERRE HAUTE, Vigo, IN | Pass | State |
| 2025-10-09 | EAST KY POWER COOP - BAVARIAN LGTE | WALTON, Boone, KY | Pass | State |
| 2025-10-09 | AGC FLAT GLASS N AMERICA INC — high-priority violation on file | RICHMOND, Madison, KY | Pass | State |
| 2025-10-09 | ZFS ITHACA, LLC — high-priority violation on file | ITHACA, Gratiot, MI | Fail | State |
| 2025-10-09 | CRYSTAL VALLEY COOPERATIVE - MADELIA | MADELIA, Watonwan, MN | Pass | State |
| 2025-10-09 | GRAYMONT WESTERN US INC | TOWNSEND, Broadwater, MT | Pass | State |
| 2025-10-09 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-09 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-09 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-09 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-09 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-09 | CITY OF GASTONIA - FREIGHTLINER GENERATOR PLANT | GASTONIA, Gaston, NC | Pass | State |
| 2025-10-09 | ONEOK ROCKIES MIDSTREAM, L.L.C. - BEAVERTAIL COMPRESSOR STATION - AQ | WATFORD CITY, McKenzie, ND | Pass | State |
| 2025-10-09 | ARROWHEAD COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2025-10-09 | LOST TANK 13 BOO STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-09 | LOST TANK 13 BOO STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-09 | FULLER EAST MEGA BATTERY NO 1 | MALAGA, Eddy, NM | Pass | State |
| 2025-10-09 | JIM PAT SWD | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-09 | JIM PAT SWD | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-09 | SIMON CAMAMILE SOUTH TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-10-09 | RUSTLER BREAKS AMINE TREATING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-10-09 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-09 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-09 | SEAWOLF COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-09 | LEA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-10-09 | EOG - EL JEFE LGL STATION | JAL, Lea, NM | Pass | State |
| 2025-10-09 | EOG - EL JEFE LGL STATION | JAL, Lea, NM | Pass | State |
| 2025-10-09 | RED TANK 26 BOO STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-10-09 | HONEOYE FALLS QUARRY & ASPHALT PLANT | LIMA;MENDON;RUSH, Livingston, NY | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.