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 |
|---|---|---|---|---|
| 2026-06-16 | OTTER TAIL POWER COMPANY | BIG STONE CITY, Grant, SD | Pass | State |
| 2026-06-16 | GCC DACOTAH — high-priority violation on file | RAPID CITY, Pennington, SD | Pass | State |
| 2026-06-16 | DAL-TILE TENNESSEE LLC | DICKSON, Dickson, TN | Pending | State |
| 2026-06-16 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2026-06-16 | APOGEE WAUSAU GROUP INC LINETEC DIVISION — high-priority violation on file | WAUSAU, Marathon, WI | Pass | State |
| 2026-06-16 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-16 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-16 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-16 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2026-06-16 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2026-06-15 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-06-15 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-06-15 | JOSIE PAYNE CONSTRUCTION CASA INC. | OLA, Yell, AR | Pass | State |
| 2026-06-15 | MONTVILLE POWER LLC | CONNECTICUT, Undetermined, CT | Pass | State |
| 2026-06-15 | MONTVILLE POWER LLC | CONNECTICUT, Undetermined, CT | Pass | State |
| 2026-06-15 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-15 | KANSAS CITY SAUSAGE, LLC , DBA PINE RIDGE FARMS | DES MOINES, Polk, IA | Pass | Local |
| 2026-06-15 | MID-STATES MATERIALS - GLOBE QUARRY | OVERBROOK, Douglas, KS | Pass | State |
| 2026-06-15 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pending | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | OHIO MIDSTREAM PARTNERS LLC THATCHER COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA, LLC - CASTON 31-11N-7W | LONDONDERRY, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA, LLC - CASTON 31-11N-7W | LONDONDERRY, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA, LLC - CASTON 31-11N-7W | LONDONDERRY, TOWNSHIP OF, Guernsey, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA LLC - RED HILL FARMS 1-3N-1W | FREEPORT, Harrison, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA LLC - RED HILL FARMS 1-3N-1W | FREEPORT, Harrison, OH | Pass | State |
| 2026-06-15 | ASCENT RESOURCES - UTICA LLC - RED HILL FARMS 1-3N-1W | FREEPORT, Harrison, OH | Pass | State |
| 2026-06-15 | UGI TEXAS CREEK LLC/CLEGG COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-06-15 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Pending | State |
| 2026-06-15 | SANDERS BROTHERS CONSTRUCTION COMPANY INC N CHARLESTON PLANT | NORTH CHARLESTON, Charleston, SC | Pass | State |
| 2026-06-15 | SOUTH TEXAS ELECTRIC COOPERATIVE | NURSERY, Victoria, TX | Pass | State |
| 2026-06-15 | SOUTH TEXAS ELECTRIC COOPERATIVE | NURSERY, Victoria, TX | Pass | State |
| 2026-06-15 | SOUTH TEXAS ELECTRIC COOPERATIVE | NURSERY, Victoria, TX | Pass | State |
| 2026-06-15 | PACKAGING CORPORATION OF AMERICA-TOMAHAW | TOMAHAWK, Lincoln, WI | Pass | State |
| 2026-06-13 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2026-06-13 | WISCONSIN ELECTRIC POWER COMPANY D/B/A WE ENERGIES-PARIS GENERATING STATION | UNION GROVE, Kenosha, WI | N/A | State |
| 2026-06-12 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-06-12 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-06-12 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-06-12 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-06-12 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-06-12 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-06-12 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-06-12 | FLORIDA GAS TRANSMISSION COMPANY, LLC | PERRY, Taylor, FL | Pass | State |
| 2026-06-12 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-12 | THOMAS A. SMITH ENERGY FACILITY | DALTON, Murray, GA | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-12 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-12 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-12 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-12 | TAMKO BUILDING PRODUCTS, INC. | JOPLIN, Jasper, MO | Pass | State |
| 2026-06-12 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-06-12 | BLUE RACER MIDSTREAM, LLC - MIZER STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-06-12 | BLUE RACER MIDSTREAM, LLC - MIZER STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-06-12 | BLUE RACER MIDSTREAM, LLC - MIZER STATION | CADIZ, Harrison, OH | Pass | State |
| 2026-06-12 | GULFPORT APPALACHIA, LLC - GEHRIG PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-12 | GULFPORT APPALACHIA, LLC - GEHRIG PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-12 | GULFPORT APPALACHIA, LLC - GEHRIG PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-06-12 | PA STATE SYS OF HIGHER ED/INDIANA UNIV | INDIANA, Indiana, PA | Pass | State |
| 2026-06-12 | PA DEPT OF CORR/LAUREL HIGHLANDS SCI | SOMERSET, Somerset, PA | Pass | State |
| 2026-06-12 | HEIDELBERG MATERIALS US CEMENT LLC/NAZARETH | NAZARETH, Northampton, PA | Pass | State |
| 2026-06-12 | BLACKHILL ENERGY LLC/BRADFORD CNTY COMP STA | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2026-06-12 | BLYTHE RIDGELAND PLANT - BLYTHE CONSTRUCTION INC | RIDGELAND, Jasper, SC | Pass | State |
| 2026-06-12 | LATERAL B20 COMPRESSOR STATION | DECATUR, Wise, TX | Pass | State |
| 2026-06-12 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-12 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-12 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-11 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2026-06-11 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2026-06-11 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2026-06-11 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2026-06-11 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-06-11 | HUNT REFINING COMPANY | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2026-06-11 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-06-11 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-06-11 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-06-11 | RAZORBACK GATHERING COMPANY, LLC. - WOOLLY HOLLOW CPF 1 | GREENBRIER, Faulkner, AR | Pass | State |
| 2026-06-11 | RAZORBACK GATHERING COMPANY, LLC. - WOOLLY HOLLOW CPF 1 | GREENBRIER, Faulkner, AR | Pass | State |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | THE WINE GROUP, INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-06-11 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-06-11 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-11 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-11 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-11 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
| 2026-06-11 | BREITBURN OPERATING LP — high-priority violation on file | OCHOPEE, Collier, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.