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 |
|---|---|---|---|---|
| 2026-03-10 | SHUR GREEN FARMS LLC | ANSONIA, Darke, OH | Pass | State |
| 2026-03-10 | SHUR GREEN FARMS LLC | ANSONIA, Darke, OH | Pass | State |
| 2026-03-10 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2026-03-10 | EASTERN GAS TRANS & STORAGE INC/BOOM STA | LAWRENCEVILLE, Tioga, PA | Pass | State |
| 2026-03-10 | RAUSCH CREEK GENERATION LLC/FRAILEY TWP — high-priority violation on file | TREMONT, Schuylkill, PA | Pass | State |
| 2026-03-10 | EQT ARO LLC/COP TRACT 685 COMP STA — high-priority violation on file | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2026-03-10 | EQM GATHERING OPCO LLC/HALO COMP STA | SYCAMORE, Greene, PA | Pass | State |
| 2026-03-10 | EXPAND OPER LLC/TI-46-BLISS WELL PAD | LIBERTY, Tioga, PA | Pass | State |
| 2026-03-10 | BOLLES COMPRESSOR STATION/JESSUP TWP | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-03-10 | US MARINE CORPS AIR STATION BEAUFORT | BEAUFORT, Beaufort, SC | Pass | State |
| 2026-03-10 | AG PROCESSING INC. | ABERDEEN, Brown, SD | Pass | State |
| 2026-03-10 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-03-10 | EXXONMOBIL BEAUMONT REFINERY — high-priority violation on file | BEAUMONT, Jefferson, TX | N/A | State |
| 2026-03-10 | COLUMBIA GAS TRANSMISSION CORP-PRINCE GEORGE | PRINCE GEORGE, Prince George, VA | Pass | State |
| 2026-03-10 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-03-10 | UNION CARBIDE CORPORATION, SOUTH CHARLESTON | SOUTH CHARLESTON, Kanawha, WV | Pass | State |
| 2026-03-09 | HILCORP ALASKA, LLC / NIKAITCHUQ DEVELOPMENT | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2026-03-09 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2026-03-09 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2026-03-09 | DESOTO GATHERING COMPANY, LLC.-OLIVER CPF-1 | SEARCY, White, AR | Pass | State |
| 2026-03-09 | AERA ENERGY LLC | SAN ARDO, Monterey, CA | Pass | Local |
| 2026-03-09 | ROCKY MOUNTAIN MIDSTREAM - AUBURN CS | KERSEY AREA, Weld, CO | Pass | State |
| 2026-03-09 | LOCKHEED MARTIN AERONAUTICS CO. | MARIETTA, Cobb, GA | Pass | State |
| 2026-03-09 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-03-09 | TEXAS EASTERN TRANSMISSION LP, CLINTON COMPRESSOR STATION | JACKSON, Hinds, MS | Pass | State |
| 2026-03-09 | TEXAS EASTERN TRANSMISSION LP, CLINTON COMPRESSOR STATION | JACKSON, Hinds, MS | Pass | State |
| 2026-03-09 | TEXAS EASTERN TRANSMISSION LP, CLINTON COMPRESSOR STATION | JACKSON, Hinds, MS | Pass | State |
| 2026-03-09 | TRIDENT | THREE FORKS, Gallatin, MT | Pass | State |
| 2026-03-09 | BWI ETN LLC - NORTH WILKESBORO QUARRY | NORTH WILKESBORO, Wilkes, NC | Pass | State |
| 2026-03-09 | TIGT BIG SPRINGS STATION | BIG SPRINGS, Deuel, NE | Pass | State |
| 2026-03-09 | LOBO COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-03-09 | LOBO COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-03-09 | LOBO COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-03-09 | LOBO COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-03-09 | LOBO COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-03-09 | CHEVRON - CULEBRA BLUFF EAST CS — high-priority violation on file | LOVING, Eddy, NM | Pass | State |
| 2026-03-09 | CHEVRON - CULEBRA BLUFF EAST CS — high-priority violation on file | LOVING, Eddy, NM | Pass | State |
| 2026-03-09 | RED ROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-03-09 | RED ROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-03-09 | DIVERSIFIED PROD LLC/BELL POINT COMP STA | APOLLO, Westmoreland, PA | Pass | State |
| 2026-03-09 | EQT ARO LLC/TRACT 285 COMP STA | NORTH BEND, Clinton, PA | Pass | State |
| 2026-03-09 | BROWNTOWN FOUNDRY LLC — high-priority violation on file | BROWNTOWN, Green, WI | Pass | State |
| 2026-03-09 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., MOBLEY GAS PLANT | SMITHFIELD, Wetzel, WV | Pass | State |
| 2026-03-08 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-08 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-08 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-08 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-08 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-08 | CZ LOCALIZED GAS LIFT | JAL, Lea, NM | Pass | State |
| 2026-03-07 | MESA VERDE EAST CGL2 | MALAGA, Lea, NM | Pass | State |
| 2026-03-07 | MESA VERDE EAST CGL2 | MALAGA, Lea, NM | Pass | State |
| 2026-03-07 | MESA VERDE EAST CGL2 | MALAGA, Lea, NM | Pass | State |
| 2026-03-06 | TRANSWESTERN PIPELINE - KINGMAN COMPRESSOR STATION | FORT ROCK ROAD, Mohave, AZ | Pass | State |
| 2026-03-06 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-06 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-06 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-06 | FLORIDA GAS TRANSMISSION COMPANY, LLC | WEST PALM BEACH, Palm Beach, FL | Pass | State |
| 2026-03-06 | CARGILL INC-CEDAR RAPIDS_SW_SOYBEAN | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-06 | CARGILL INC-CEDAR RAPIDS_SW_SOYBEAN | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-06 | CARGILL INC-CEDAR RAPIDS_SW_SOYBEAN | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-06 | ZIMMER BIOMET INC. — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-06 | ZIMMER BIOMET INC. — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-06 | ZIMMER BIOMET INC. — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-06 | ZIMMER BIOMET INC. — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-06 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-06 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-06 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-06 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-06 | BUILDING MATERIALS MANUFACTURING LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-03-06 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-03-06 | THOMAS HILL ENERGY CENTER - POWER DIVISION | CLIFTON HILL, Randolph, MO | Pass | State |
| 2026-03-06 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-06 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-06 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-06 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-06 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-06 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-06 | GCF US HOLDINGS LLC - NEW BERN MILL | VANCEBORO, Craven, NC | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | MARKWEST BARNESVILLE WEST COMPRESSOR STATION | WARREN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-03-06 | WATEREE STATION | EASTOVER, Richland, SC | Pass | State |
| 2026-03-06 | ISKANDER (LC-1A) JAMSHID (LC-1B) KAVEH (LC2) LOHRASP VENTURES (LC3) — high-priority violation on file | ASHBURN, Loudoun, VA | Pass | State |
| 2026-03-06 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-03-06 | FML | BELOIT, Rusk, WI | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.