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 |
|---|---|---|---|---|
| 2026-02-18 | O-N MINERALS (CHEMSTONE) COMPANY - MIDDLETOWN | MIDDLETOWN, Frederick, VA | Pass | State |
| 2026-02-18 | DOMINION - SOUTHAMPTON POWER STATION | FRANKLIN, Southampton, VA | Pass | State |
| 2026-02-18 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-18 | BOISE CASCADE PLYWD | KETTLE FALLS, Stevens, WA | Pass | State |
| 2026-02-18 | KENTUCKY POWER COMPANY, MITCHELL PLANT | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2026-02-18 | EASTERN GAS TRANSMISSION AND STORAGE, INC., MOCKINGBIRD HILL | PINE GROVE, Wetzel, WV | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-18 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-18 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-18 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-18 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-18 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-17 | INTERNATIONAL PAPER COMPANY | PRATTVILLE, Autauga, AL | Pass | State |
| 2026-02-17 | NOURYON FUNCTIONAL CHEMICALS LLC | AXIS, Mobile, AL | Pass | State |
| 2026-02-17 | NOURYON FUNCTIONAL CHEMICALS LLC | AXIS, Mobile, AL | Pass | State |
| 2026-02-17 | NOURYON FUNCTIONAL CHEMICALS LLC | AXIS, Mobile, AL | Pass | State |
| 2026-02-17 | 3M COMPANY | DECATUR, Morgan, AL | Pass | State |
| 2026-02-17 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-02-17 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-17 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-17 | RAZORBACK GATHERING COMPANY, LLC. - SUNNY HILL COMPRESSOR STATION | SEARCY, White, AR | Pass | State |
| 2026-02-17 | RAZORBACK GATHERING COMPANY, LLC. - SUNNY HILL COMPRESSOR STATION | SEARCY, White, AR | Pass | State |
| 2026-02-17 | DUKE ENERGY FLORIDA, LLC | CRYSTAL RIVER, Citrus, FL | Pass | State |
| 2026-02-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-02-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-02-17 | AMERITERPENES, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-02-17 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2026-02-17 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2026-02-17 | TENASKA GEORGIA GENERATING STATION | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-17 | TENASKA GEORGIA GENERATING STATION | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-17 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-02-17 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-02-17 | C & D TECHNOLOGIES INC | ATTICA, Fountain, IN | Pass | State |
| 2026-02-17 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-02-17 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-02-17 | MASSACHUSETTS INSTITUTE OF TECHNOLOGY | CAMBRIDGE, TOWN OF, Middlesex, MA | Pending | State |
| 2026-02-17 | MASSACHUSETTS INSTITUTE OF TECHNOLOGY | CAMBRIDGE, TOWN OF, Middlesex, MA | Pending | State |
| 2026-02-17 | PLAYER HOLDINGS, LLC | ASHLAND, Aroostook, ME | Fail | State |
| 2026-02-17 | WESTERN MICHIGAN UNIVERSITY | KALAMAZOO, Kalamazoo, MI | Pass | State |
| 2026-02-17 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2026-02-17 | POET BIOREFINING GLENVILLE LLC | ALBERT LEA, Freeborn, MN | Pass | State |
| 2026-02-17 | AMERICAN CRYSTAL SUGAR - EAST GRAND FORKS | EAST GRAND FORKS, Polk, MN | Pass | State |
| 2026-02-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Fail | State |
| 2026-02-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Fail | State |
| 2026-02-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2026-02-17 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-17 | ALPEK POLYESTER MISSISSIPPI INC — high-priority violation on file | BAY ST. LOUI, Hancock, MS | Pass | State |
| 2026-02-17 | NUCOR STEEL JACKSON INC | FLOWOOD, Rankin, MS | Pass | State |
| 2026-02-17 | NUCOR STEEL JACKSON INC | FLOWOOD, Rankin, MS | Pass | State |
| 2026-02-17 | PAR MONTANA BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-02-17 | DUKE ENERGY CAROLINAS, LLC - MARSHALL STEAM STATION | TERRELL, Catawba, NC | Pending | State |
| 2026-02-17 | DOMTAR PAPER COMPANY, LLC | PLYMOUTH, Martin, NC | Pass | State |
| 2026-02-17 | GREDE II - BISCOE, LLC — high-priority violation on file | BISCOE, Montgomery, NC | Pending | State |
| 2026-02-17 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-02-17 | NATURALLY RECYCLED PROTEINS — high-priority violation on file | WAKEFIELD, Dixon, NE | Pass | State |
| 2026-02-17 | RAMBO BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-17 | SALT DRAW COMPRESSOR STATION — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-02-17 | GARRETT FED COM FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-17 | ACE STERN VEGAS FACILITY | LOVING, Eddy, NM | Pass | State |
| 2026-02-17 | BILL WILSHUSEN TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | BILL WILSHUSEN TB | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | JALAPENO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | JALAPENO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | JALAPENO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | JALAPENO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | JALAPENO COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-17 | COUSIN EDDY FED UNIT BATTERY #1 | LOVING, Eddy, NM | Pass | State |
| 2026-02-17 | AZTEC COMPRESSOR STATION — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2026-02-17 | BULL RUN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-17 | GENIE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-17 | QUEEN KEELY CTB | MONUMENT, Lea, NM | Pass | State |
| 2026-02-17 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2026-02-17 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2026-02-17 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2026-02-17 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-02-17 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-02-17 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2026-02-17 | COOPER STANDARD AUTOMOTIVE | NEW LEXINGTON, Perry, OH | Pass | State |
| 2026-02-17 | COOPER STANDARD AUTOMOTIVE | NEW LEXINGTON, Perry, OH | Pass | State |
| 2026-02-17 | COOPER STANDARD AUTOMOTIVE | NEW LEXINGTON, Perry, OH | Pass | State |
| 2026-02-17 | COOPER STANDARD AUTOMOTIVE | NEW LEXINGTON, Perry, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.