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 |
|---|---|---|---|---|
| 2026-06-09 | OLD DIXIE MUNICIPAL SOLID WASTE LANDFILL | DALTON, Whitfield, GA | Pass | State |
| 2026-06-09 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-09 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-09 | ILLINOIS MUNICIPAL ELECTRIC AGENCY | FLORA, Clay, IL | Pass | State |
| 2026-06-09 | CITGO PETROLEUM CORP — high-priority violation on file | LEMONT, Will, IL | Pending | State |
| 2026-06-09 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-06-09 | NUCOR STEEL — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-09 | AMSTED RAIL (AIR) | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2026-06-09 | CONSTELLATION WEST MEDWAY LLC | MEDWAY, Norfolk, MA | Pending | State |
| 2026-06-09 | CONSTELLATION WEST MEDWAY LLC | MEDWAY, Norfolk, MA | Pending | State |
| 2026-06-09 | BLYTHE CONSTRUCTION, INC. - NORTH PLANT | CHARLOTTE, Mecklenburg, NC | Pass | Local |
| 2026-06-09 | DOUGLAS COUNTY RDF | BENNINGTON, Douglas, NE | N/A | State |
| 2026-06-09 | MANCHESTER, CITY OF - WATER TREATMENT PLANT | MANCHESTER, Hillsborough, NH | Pass | State |
| 2026-06-09 | JR SIMPLOT COMPANY | OVERTON, Clark, NV | Pass | Local |
| 2026-06-09 | FINCH PAPER LLC | GLENS FALLS, Warren, NY | Pass | State |
| 2026-06-09 | INDEPENDENCE STATION | SCRIBA, Oswego, NY | Pass | State |
| 2026-06-09 | NSG GLASS NORTH AMERICA, INC. — high-priority violation on file | LUCKEY, Wood, OH | Fail | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - VALERIE WELL PAD | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-09 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - FLEAGANE PLT BL | BELLAIRE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - FLEAGANE PLT BL | BELLAIRE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - FLEAGANE PLT BL | BELLAIRE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - BLESSED RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - BLESSED RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-06-09 | ASCENT RESOURCES - UTICA LLC - BLESSED RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - GUERNSEY CO FIELD STATION #1 | FAIRVIEW, Guernsey, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - GUERNSEY CO FIELD STATION #1 | FAIRVIEW, Guernsey, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - GUERNSEY CO FIELD STATION #1 | FAIRVIEW, Guernsey, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - HFS#2 | CADIZ, Harrison, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - HFS#2 | CADIZ, Harrison, OH | Pass | State |
| 2026-06-09 | BLUE RACER MIDSTREAM LLC - HFS#2 | CADIZ, Harrison, OH | Pass | State |
| 2026-06-09 | KENWORTH TRUCK COMPANY | CHILLICOTHE, Ross, OH | Pass | State |
| 2026-06-09 | KENWORTH TRUCK COMPANY | CHILLICOTHE, Ross, OH | Pass | State |
| 2026-06-09 | MERCK SHARP & DOHME LLC/WEST PT | WEST POINT, Montgomery, PA | Pass | State |
| 2026-06-09 | MTN GATHERING LLC/FORWARD COMP STA | RENFREW, Butler, PA | Pass | State |
| 2026-06-09 | BLUESTONE PIPELINE CO OF PA CDP#5/HARFORD TWP | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-06-09 | DOMTAR PAPER COMPANY LLC | BENNETTSVILLE, Marlboro, SC | Pass | State |
| 2026-06-09 | TENNESSEE GAS PIPELINE COMPANY, L.L.C. | PORTLAND, Sumner, TN | Pending | State |
| 2026-06-09 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-06-09 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-06-09 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-06-09 | GERDAU MIDLOTHIAN PLANT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-06-09 | GERDAU MIDLOTHIAN PLANT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-06-09 | GERDAU MIDLOTHIAN PLANT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-06-09 | WISCONSIN ELECTRIC POWER COMPANY (DBA WE ENERGIES) - ROTHSCHILD BIOMASS COGENERA — high-priority violation on file | ROTHSCHILD, Marathon, WI | Pass | State |
| 2026-06-09 | WISCONSIN PUBLIC SERVICE CORPORATION - F | KAUKAUNA, Outagamie, WI | Pass | State |
| 2026-06-09 | WISCONSIN PUBLIC SERVICE CORPORATION - F | KAUKAUNA, Outagamie, WI | Pass | State |
| 2026-06-09 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2026-06-09 | WPL - RIVERSIDE ENERGY CENTER | BELOIT, Rusk, WI | Pass | State |
| 2026-06-09 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-09 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-09 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-09 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-06-09 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-06-08 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-06-08 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2026-06-08 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-1 | QUITMAN, Faulkner, AR | Pass | State |
| 2026-06-08 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-1 | QUITMAN, Faulkner, AR | Pass | State |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-08 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-06-08 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Fail | State |
| 2026-06-08 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-08 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-08 | NASA KENNEDY SPACE CENTER | JOHN F KENNEDY SPACE CENTER, Brevard, FL | Pass | State |
| 2026-06-08 | FLORIDA GAS TRANSMISSION COMPANY, LLC | CARYVILLE, Washington, FL | Pass | State |
| 2026-06-08 | FLORIDA GAS TRANSMISSION COMPANY, LLC | CARYVILLE, Washington, FL | Pass | State |
| 2026-06-08 | FLORIDA GAS TRANSMISSION COMPANY, LLC | CARYVILLE, Washington, FL | Pass | State |
| 2026-06-08 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-06-08 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-06-08 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-06-08 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-08 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pending | State |
| 2026-06-08 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pending | State |
| 2026-06-08 | KINCAID GENERATION LLC | KINCAID, Christian, IL | Pending | State |
| 2026-06-08 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-06-08 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-06-08 | ID CASTINGS OF ILLINOIS LLC — high-priority violation on file | MARTINSVILLE, Clark, IL | Pass | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.