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 |
|---|---|---|---|---|
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2026-06-25 | ET GATHERING PROCESSING LLC / TUSSY COMPRESSOR STATION | RATLIFF CITY, Carter, OK | Pending | State |
| 2026-06-25 | PEOPLES NATURAL GAS CO LLC/VALLEY STA | YATESBORO, Armstrong, PA | Pass | State |
| 2026-06-25 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-06-25 | GREEN BAY PACKAGING INC - GB MILL DIV | GREEN BAY, Brown, WI | Pass | State |
| 2026-06-25 | DAIRYLAND BIOGAS - AGRA RNG-GTL PROJECT — high-priority violation on file | NEW FRANKEN, Brown, WI | Pass | State |
| 2026-06-25 | VIRGINIA ELECTRIC AND POWER COMPANY, MT. STORM | MT. STORM, Grant, WV | Pass | State |
| 2026-06-25 | VIRGINIA ELECTRIC AND POWER COMPANY, MT. STORM | MT. STORM, Grant, WV | Pass | State |
| 2026-06-25 | AMERICAN BITUMINOUS POWER PARTNERS, L. P., GRANT | GRANT TOWN, Marion, WV | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | KNAUF INSULATION | LANETT, Chambers, AL | Pass | State |
| 2026-06-24 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-24 | U S NAVAL SUBMARINE BASE — high-priority violation on file | GROTON (HISTORICAL), New London, CT | Pass | State |
| 2026-06-24 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-06-24 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-06-24 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-06-24 | BUCKEYE TERMINALS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-06-24 | FLORIDA MUNICIPAL POWER AGENCY — high-priority violation on file | ORLANDO, Orange, FL | Pass | State |
| 2026-06-24 | FLORIDA MUNICIPAL POWER AGENCY — high-priority violation on file | ORLANDO, Orange, FL | Pass | State |
| 2026-06-24 | FLORIDA MUNICIPAL POWER AGENCY — high-priority violation on file | ORLANDO, Orange, FL | Pass | State |
| 2026-06-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-24 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | PALM BEACH COUNTY, Palm Beach, FL | Pass | State |
| 2026-06-24 | C.W. MATTHEWS CONTRACTING CO., INC. - BOLINGBROKE ASPHALT PLANT | BOLINGBROKE, Monroe, GA | Pass | State |
| 2026-06-24 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-24 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-24 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-24 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2026-06-24 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-06-24 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-06-24 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-06-24 | STAKER AND PARSON COMPANIES DBA IDAHO MATERIALS AND CONSTRUCTION 00406 | MERIDIAN, Ada, ID | Pass | State |
| 2026-06-24 | MARSHALL MUNICIPAL UTILITIES | MARSHALL, Clark, IL | Pass | State |
| 2026-06-24 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-24 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-24 | ARCHER DANIELS MIDLAND CO — high-priority violation on file | DECATUR, Macon, IL | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | POET BIOREFINING PORTLAND LLC | PORTLAND, Jay, IN | Pass | State |
| 2026-06-24 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-24 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-24 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-24 | ALBANESE CONFECTIONERY GROUP INC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-24 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-24 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-24 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-06-24 | SAINT MARY MEDICAL CENTER — high-priority violation on file | HOBART, Lake, IN | Pass | State |
| 2026-06-24 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-06-24 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-06-24 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-06-24 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-06-24 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-06-24 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Fail | State |
| 2026-06-24 | TENNESSEE VALLEY AUTHORITY (TVA) - SHAWNEE FOSSIL PLANT | WEST PADUCAH, McCracken, KY | Pass | State |
| 2026-06-24 | EASTON UTILITIES - WASHINGTON STREET | EASTON, Talbot, MD | Pending | State |
| 2026-06-24 | DTE GAS COMPANY - BELLE RIVER MILLS COMPRESSOR STATION | CHINA, St. Clair, MI | Pass | State |
| 2026-06-24 | KENT COUNTY WASTE TO ENERGY FACILITY | GRAND RAPIDS, Kent, MI | Pass | State |
| 2026-06-24 | RJ ZAVORAL AND SONS INC HMA PORTABLE PLANT 1 | EAST GRAND FORKS, Polk, MN | Pass | State |
| 2026-06-24 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-06-24 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-06-24 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-06-24 | PAR MONTANA BULK TERMINAL | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-06-24 | WHEELABRATOR CONCORD COMPANY, L.P. | CONCORD, Merrimack, NH | Pending | State |
| 2026-06-24 | IMERYS FUSED MINERALS NIAGARA FALLS INC | NIAGARA FALLS, Niagara, NY | Fail | State |
| 2026-06-24 | TRIVIUM ALUMINUM PACKAGING USA CORPORATION | YOUNGSTOWN, Mahoning, OH | Pass | State |
| 2026-06-24 | ENBRIDGE GAS OHIO - PAINT | WOOSTER, Wayne, OH | Pass | State |
| 2026-06-24 | ENBRIDGE GAS OHIO - PAINT | WOOSTER, Wayne, OH | Pass | State |
| 2026-06-24 | ENBRIDGE GAS OHIO - PAINT | WOOSTER, Wayne, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.