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 |
|---|---|---|---|---|
| 2026-05-15 | AMERICAN CAST IRON PIPE COMPANY | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-05-15 | RECONSERVE OF CALIFORNIA - STOCKTON INC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2026-05-15 | WASTE CONNECTIONS OF OSCEOLA COUNTY, LLC | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-15 | NORTHERN NATURAL GAS CO- VENTURA | GARNER, Hancock, IA | Pass | State |
| 2026-05-15 | NORTHERN NATURAL GAS CO- VENTURA | GARNER, Hancock, IA | Pass | State |
| 2026-05-15 | TMC INC | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-15 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-05-15 | LEHIGH CEMENT COMPANY - UNION BRIDGE | UNION BRIDGE, Carroll, MD | Pass | State |
| 2026-05-15 | FORD MOTOR COMPANY WAYNE COMPLEX | WAYNE, Wayne, MI | Pass | State |
| 2026-05-15 | FCA US LLC STERLING HEIGHTS ASSEMBLY PLANT | STERLING HEIGHTS, Macomb, MI | Pass | State |
| 2026-05-15 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2026-05-15 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2026-05-15 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2026-05-15 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2026-05-15 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2026-05-15 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2026-05-15 | CAVERN COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-05-15 | WALLEYE POWER, LLC, BAY SHORE PLANT | OREGON, Lucas, OH | Pass | State |
| 2026-05-15 | GENERAL JAMES M. GAVIN POWER PLANT | CHESHIRE, Gallia, OH | Pass | State |
| 2026-05-15 | CITGO CORPUS CHRISTI REFINERY EAST PLANT — high-priority violation on file | CORPUS CHRISTI, Nueces, TX | N/A | State |
| 2026-05-15 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2026-05-15 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2026-05-15 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-05-15 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-05-14 | SOUTHERN NATURAL GAS | HEFLIN, Cleburne, AL | Pass | State |
| 2026-05-14 | SOUTHERN NATURAL GAS | HEFLIN, Cleburne, AL | Pass | State |
| 2026-05-14 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-05-14 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-05-14 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-05-14 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-3 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-05-14 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-2 | QUITMAN, Faulkner, AR | Pass | State |
| 2026-05-14 | APS OCOTILLO POWER PLANT | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-05-14 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-14 | KT RESOURCES - WHITE RIVER DOME | MEEKER 14.5 MI. W OF, Rio Blanco, CO | Pass | State |
| 2026-05-14 | PDC ENERGY - BEEBE 3-34 PAD | GREELEY, Weld, CO | Pass | State |
| 2026-05-14 | WHEELABRATOR BRIDGEPORT LP | BRIDGEPORT, Fairfield, CT | Pass | State |
| 2026-05-14 | OWENS CORNING INSULATING SYSTEMS, LLC | LAKELAND, Polk, FL | Pass | State |
| 2026-05-14 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-14 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-14 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-14 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-14 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-14 | ILLINOIS POWER GENERATING CO | NEWTON, Jasper, IL | Pass | State |
| 2026-05-14 | WAYNE CO LANDFILL INC | FAIRFIELD, Wayne, IL | Pass | State |
| 2026-05-14 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Fail | State |
| 2026-05-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-14 | PVS TECHNOLOGIES INC — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-05-14 | PVS TECHNOLOGIES INC — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2026-05-14 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-05-14 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-05-14 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-05-14 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-14 | CONSUMERS ENERGY CO. - JACKSON GENERATING STATION | JACKSON, Jackson, MI | Pass | State |
| 2026-05-14 | MISSISSIPPI LIME COMPANY | SAINTE GENEVIEVE, Ste. Genevieve, MO | Pass | State |
| 2026-05-14 | MISSISSIPPI LIME COMPANY | SAINTE GENEVIEVE, Ste. Genevieve, MO | Pass | State |
| 2026-05-14 | MISSISSIPPI LIME COMPANY | SAINTE GENEVIEVE, Ste. Genevieve, MO | Pass | State |
| 2026-05-14 | TRANSMONTAIGNE OPERATING COMPANY LP, COLLINS SOUTHEAST TERMINAL | COLLINS, Covington, MS | Pass | State |
| 2026-05-14 | TRANSMONTAIGNE OPERATING COMPANY LP, COLLINS SOUTHEAST TERMINAL | COLLINS, Covington, MS | Pass | State |
| 2026-05-14 | TRANSMONTAIGNE OPERATING COMPANY LP, COLLINS SOUTHEAST TERMINAL | COLLINS, Covington, MS | Pass | State |
| 2026-05-14 | GCF US HOLDINGS, LLC - COLUMBUS MILL — high-priority violation on file | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-05-14 | CITY OF HIGH POINT - EASTSIDE WASTEWATER TREATMENT PLANT | JAMESTOWN, Guilford, NC | Pending | State |
| 2026-05-14 | PRESTAGE FARMS, INC. - HWY. 421 PLANT | CLINTON, Sampson, NC | Pending | State |
| 2026-05-14 | B. V. HEDRICK GRAVEL AND SAND COMPANY - AQUADALE QUARRY | NORWOOD, Stanly, NC | Pass | State |
| 2026-05-14 | TERREVA WAYNE COUNTY RNG, LLC | DUDLEY, Wayne, NC | Pending | State |
| 2026-05-14 | EMPIRE ABO CS | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-14 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-14 | THE DUDE CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-14 | STARBUCKS MANUFACTURING COMPANY | MINDEN, Douglas, NV | Pass | State |
| 2026-05-14 | WINNEMUCCA PLANT — high-priority violation on file | WINNEMUCCA, Humboldt, NV | Incomplete | State |
| 2026-05-14 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Pass | State |
| 2026-05-14 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Pass | State |
| 2026-05-14 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Pass | State |
| 2026-05-14 | FORREST PAINT CO. | EUGENE, Lane, OR | Pending | Local |
| 2026-05-14 | ENERGY TRANSFER M&T/DELMONT FACILITY | DELMONT, Westmoreland, PA | Pass | State |
| 2026-05-14 | EASTERN GAS TRANS & STORAGE INC/ELLISBURG STA | GENESSEE, Potter, PA | Pass | State |
| 2026-05-14 | SNYDER BROS INC/FURNACE RUN COMP STA | ADRIAN, Armstrong, PA | Pass | State |
| 2026-05-14 | BLUESTONE PIPELINE/CDP#1-A | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-05-14 | WILLIAMS FIELD SVC CO/POTTER COMP STA | KINGSLEY, Susquehanna, PA | Pass | State |
| 2026-05-14 | USS/CLAIRTON WORKS — high-priority violation on file | CLAIRTON, Allegheny, PA | Pass | Local |
| 2026-05-14 | SONOCO PRODUCTS COMPANY | HARTSVILLE, Darlington, SC | Pending | State |
| 2026-05-14 | KING ASPHALT INC - MYRTLE BEACH PLANT | CONWAY, Horry, SC | Pass | State |
| 2026-05-14 | MICROSOFT CORPORATION - MKE 3B DATA CENTER | MOUNT PLEASANT, Richland, WI | Pass | State |
| 2026-05-14 | AMERICAN BITUMINOUS POWER PARTNERS, L. P., GRANT | GRANT TOWN, Marion, WV | Pass | State |
| 2026-05-14 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-14 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-14 | GREEN RIVER WORKS (TATA CHEMICALS (SODA ASH) PARTNERS) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-14 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-14 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-13 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2026-05-13 | FAIRBANKS NORTH STAR BOROUGH/DEPARTMEN / FNSB SOLID WASTE FACILITY | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2026-05-13 | SOUTHERN NATURAL GAS | ANNISTON, Calhoun, AL | Pass | State |
| 2026-05-13 | SOUTHERN NATURAL GAS | ANNISTON, Calhoun, AL | Pass | State |
| 2026-05-13 | KIMBERLY-CLARK CORPORATION | MOBILE, Mobile, AL | Pass | State |
| 2026-05-13 | KIMBERLY-CLARK CORPORATION | MOBILE, Mobile, AL | Pass | State |
| 2026-05-13 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-05-13 | CHENEY LIME & CEMENT COMPANY | ALABASTER, Shelby, AL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.