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 |
|---|---|---|---|---|
| 2026-03-06 | OMNIS PLEASANTS, LLC, PLEASANTS POWER STATION | WILLOW ISLAND, Pleasants, WV | Pass | State |
| 2026-03-05 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-05 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-05 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-05 | STEEL DUST RECYCLING LLC | MILLPORT, Lamar, AL | Pass | State |
| 2026-03-05 | NATIONAL CEMENT CO OF ALABAMA — high-priority violation on file | RAGLAND, St. Clair, AL | Pass | State |
| 2026-03-05 | NATIONAL CEMENT CO OF ALABAMA — high-priority violation on file | RAGLAND, St. Clair, AL | Pass | State |
| 2026-03-05 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-1 | QUITMAN, Faulkner, AR | Pass | State |
| 2026-03-05 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-1 | SEARCY, White, AR | Pass | State |
| 2026-03-05 | AIR LIQUID LARGE INDUSTRIES US, LP | EL SEGUNDO, Los Angeles, CA | Pass | Local |
| 2026-03-05 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-03-05 | PFIZER GLOBAL MANUFACTURING | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | TRAIL RIDGE ENERGY, LLC | BALDWIN, Duval, FL | Pass | State |
| 2026-03-05 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-05 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-05 | ENVIROFOCUS TECHNOLOGIES DBA GOPHER RESO — high-priority violation on file | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-05 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-03-05 | HSAGP ENERGY LLC | KINGSTON, Bartow, GA | Pass | State |
| 2026-03-05 | HSAGP ENERGY LLC | KINGSTON, Bartow, GA | Pass | State |
| 2026-03-05 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-05 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-03-05 | SUGAR CAMP ENERGY LLC | MACEDONIA, Franklin, IL | Pass | State |
| 2026-03-05 | EXXON MOBIL OIL CORP — high-priority violation on file | CHANNAHON, Will, IL | Pass | State |
| 2026-03-05 | DUKE ENERGY INDIANA LLC EDWARDSPORT GENERATING STATION | EDWARDSPORT, Knox, IN | Pass | State |
| 2026-03-05 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2026-03-05 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-03-05 | PHARMACIA & UPJOHN CO LLC, A SUBSIDIARY OF PFIZER | KALAMAZOO, Kalamazoo, MI | Fail | State |
| 2026-03-05 | DTE GAS COMPANY - BELLE RIVER MILLS COMPRESSOR STATION | CHINA, St. Clair, MI | Pass | State |
| 2026-03-05 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2026-03-05 | US STEEL CORP - MINNTAC | MOUNTAIN IRON, St. Louis, MN | Pass | State |
| 2026-03-05 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2026-03-05 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2026-03-05 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2026-03-05 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2026-03-05 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2026-03-05 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2026-03-05 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-03-05 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-03-05 | SOUTHERN STAR CENTRAL PIPELINE-PECULIAR | PECULIAR, Cass, MO | Pass | State |
| 2026-03-05 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-05 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-05 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-05 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-05 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-05 | SG RESOURCES MISSISSIPPI LLC, SOUTHERN PINES ENERGY CENTER | LEAKESVILLE, Greene, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | ALUMINUM DYNAMICS, LLC | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-05 | HESS NORTH DAKOTA PIPELINES LLC - EAST NESSON COMPRESSOR STATION 1 - AQ | WHITE EARTH, Mountrail, ND | Pass | State |
| 2026-03-05 | 3 BEAR LIBBY GAS PLANT | MONUMENT, Lea, NM | Pass | State |
| 2026-03-05 | ELI COMPRESSOR STATION | HOBBS, Lea, NM | Pass | State |
| 2026-03-05 | ELI COMPRESSOR STATION | HOBBS, Lea, NM | Pass | State |
| 2026-03-05 | CZ LOCALIZED GAS LIFT | JAL, Lea, NM | Pass | State |
| 2026-03-05 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2026-03-05 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2026-03-05 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2026-03-05 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2026-03-05 | PILKINGTON NORTH AMERICA INC — high-priority violation on file | ROSSFORD, Wood, OH | Pass | State |
| 2026-03-05 | RICE DRILLING D LLC - EISENBARTH PAD | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-05 | RICE DRILLING D LLC - EISENBARTH PAD | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-05 | RICE DRILLING D LLC - EISENBARTH PAD | CLARINGTON, Monroe, OH | Pass | State |
| 2026-03-05 | YELLOW ROSE PAD 953034 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-03-05 | YELLOW ROSE PAD 953034 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-03-05 | YELLOW ROSE PAD 953034 | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-03-05 | EQT ARO LLC/TRACT 289 COMP STA — high-priority violation on file | JERSEY SHORE, Lycoming, PA | Pass | State |
| 2026-03-05 | SNYDER BROS INC/AMBROSE COMP STA | ADRIAN, Armstrong, PA | Pass | State |
| 2026-03-05 | SMELTER SERVICE CORP. | MOUNT PLEASANT, Maury, TN | Pass | State |
| 2026-03-05 | WHEELER DATA CENTER | STERLING, Loudoun, VA | Pending | State |
| 2026-03-05 | STACK INFRASTRUCTURE - SI NVA06A LLC | LEESBURG, Loudoun, VA | Pass | State |
| 2026-03-05 | IRON MOUNTAIN INFORMATION MANAGEMENT LLC — high-priority violation on file | MANASSAS, Prince William, VA | Pass | State |
| 2026-03-05 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-03-05 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2026-03-05 | AMERICAN BITUMINOUS POWER PARTNERS, L. P., GRANT | GRANT TOWN, Marion, WV | Pass | State |
| 2026-03-05 | WILLIAMS OHIO VALLEY MIDSTREAM LLC, FT. BEELER | CAMERON, Marshall, WV | Pass | State |
| 2026-03-05 | OMNIS PLEASANTS, LLC, PLEASANTS POWER STATION | WILLOW ISLAND, Pleasants, WV | Pass | State |
| 2026-03-05 | GREYBULL PLANT (WYO-BEN, INC.) | GREYBULL, Big Horn, WY | Pass | State |
| 2026-03-05 | GREYBULL PLANT (WYO-BEN, INC.) | GREYBULL, Big Horn, WY | Pass | State |
| 2026-03-05 | GREYBULL PLANT (WYO-BEN, INC.) | GREYBULL, Big Horn, WY | Pass | State |
| 2026-03-05 | GREYBULL PLANT (WYO-BEN, INC.) | GREYBULL, Big Horn, WY | Pass | State |
| 2026-03-05 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-05 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-05 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-05 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-03-05 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-03-05 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-03-05 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-03-05 | DOTY MOUNTAIN COMPRESSOR STATION (US REALM VENTURES) | CARBON COUNTY, Carbon, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.