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 |
|---|---|---|---|---|
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2026-06-04 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2026-06-04 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2026-06-04 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2026-06-04 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2026-06-04 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2026-06-04 | JH RUDOLPH & COMPANY INCORPORATED PETERSBURG | DALE, Spencer, IN | Pass | State |
| 2026-06-04 | ST MARYS CEMENT U.S. LLC, CHARLEVOIX PLANT | CHARLEVOIX, Charlevoix, MI | Pass | State |
| 2026-06-04 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-06-04 | MICHIGAN STATE UNIVERSITY | EAST LANSING, Ingham, MI | Pass | State |
| 2026-06-04 | HOLLAND BPW, 48TH STREET PEAKING STATION | HOLLAND, Allegan, MI | Pass | State |
| 2026-06-04 | DTE MICHIGAN POWER, LLC | LUDINGTON, Mason, MI | Pass | State |
| 2026-06-04 | INDECK NILES LLC | NILES, Cass, MI | Pass | State |
| 2026-06-04 | GOLD QUARRY OPERATIONS — high-priority violation on file | CARLIN, Eureka, NV | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-06-04 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | BOLEN PAD 952350 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-04 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-06-04 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-06-04 | ORMET 15 PAD 952728 | CLARINGTON, Monroe, OH | Pass | State |
| 2026-06-04 | VORTEQ COIL FINISHERS/VALENCIA PLT | VALENCIA, Butler, PA | Pass | State |
| 2026-06-04 | CHAMBERSBURG BORO/ORCHARD PARK GENERATING STA | CHAMBERSBURG, Franklin, PA | Pass | State |
| 2026-06-04 | NEXTERA RENEWABLE FUELS LLC/BLUE RIDGE LDFL | SCOTLAND, Franklin, PA | Pass | State |
| 2026-06-04 | HICKORY RUN ENERGY LLC/NORTH BEAVER TWP | NEW CASTLE, Lawrence, PA | Pass | State |
| 2026-06-04 | WILLIAMS FIELD SVC CO LLC/HAWLEY COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-06-04 | CHESAPEAKE APPALACHIA LLC/AMCOR WELLPAD | MESHOPPEN, Wyoming, PA | Pass | State |
| 2026-06-04 | BALL METAL BEVERAGE CONTAINER CORP/PITTSTON | PITTSTON, Luzerne, PA | Pass | State |
| 2026-06-04 | AMERESCO FEDERAL SOLUTIONS | AIKEN, Aiken, SC | Pass | State |
| 2026-06-04 | VULCAN CONSTRUCTION MATERIALS LLC COLUMBIA QUARRY | COLUMBIA, Richland, SC | Pass | State |
| 2026-06-04 | MULTI-COLOR CORPORATION | CLARKSVILLE, Montgomery, TN | Pass | State |
| 2026-06-04 | FHR CORPUS CHRISTI WEST REFINERY — high-priority violation on file | CORPUS CHRISTI, Nueces, TX | Fail | State |
| 2026-06-04 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2026-06-04 | THE CHEMOURS COMPANY FC, LLC, WASHINGTON WORKS — high-priority violation on file | WASHINGTON, Wood, WV | Pass | State |
| 2026-06-04 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-04 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-04 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-03 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2026-06-03 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2026-06-03 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2026-06-03 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2026-06-03 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2026-06-03 | DESOTO GATHERING COMPANY, LLC.-STONEFLY CPF 1 | SIDON, Cleburne, AR | Pass | State |
| 2026-06-03 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-06-03 | GOLD ROAD MINE | OATMAN, Mohave, AZ | Pass | State |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | FINK ROAD LANDFILL — high-priority violation on file | CROWS LANDING, Stanislaus, CA | Pass | Local |
| 2026-06-03 | PLAINFIELD RENEWABLE ENERGY LLC | PLAINFIELD, Litchfield, CT | Pass | State |
| 2026-06-03 | PLAINFIELD RENEWABLE ENERGY LLC | PLAINFIELD, Litchfield, CT | Fail | State |
| 2026-06-03 | ORIENT CORPORATION OF AMERICA | SEAFORD, Sussex, DE | Pass | State |
| 2026-06-03 | ORIENT CORPORATION OF AMERICA | SEAFORD, Sussex, DE | Pass | State |
| 2026-06-03 | ORIENT CORPORATION OF AMERICA | SEAFORD, Sussex, DE | Pass | State |
| 2026-06-03 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-06-03 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-06-03 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2026-06-03 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2026-06-03 | BALL METAL BEVERAGE CONTAINER CORP. | WINTER HAVEN, Polk, FL | Pass | State |
| 2026-06-03 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-03 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-03 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-03 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-03 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-03 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-03 | DELTA AIR LINES INC. - TECHNICAL OPERATIONS CENTER | ATLANTA, Clayton, GA | Pass | State |
| 2026-06-03 | EDWARD L. ADDISON GENERATING PLANT | THOMASTON, Upson, GA | Pass | State |
| 2026-06-03 | DOYLE ENERGY FACILITY | MONROE, Walton, GA | Pass | State |
| 2026-06-03 | DOYLE ENERGY FACILITY | MONROE, Walton, GA | Pass | State |
| 2026-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-03 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-03 | POET BIOREFINING - COON RAPIDS, LLC | COON RAPIDS, Guthrie, IA | Pass | State |
| 2026-06-03 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2026-06-03 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2026-06-03 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2026-06-03 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2026-06-03 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2026-06-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-03 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.