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 |
|---|---|---|---|---|
| 2026-05-28 | RING NECK ENERGY & FEED LLC — high-priority violation on file | ONIDA, Sully, SD | Pass | State |
| 2026-05-28 | WEIR SPECIALTY PUMPS/ENVIROTECH RUBBER | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2026-05-28 | MOUNTAIN GATHERING, LLC, MCCLELLAND STATION | WORTHINGTON, Marion, WV | Pass | State |
| 2026-05-28 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2026-05-28 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-28 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-28 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-28 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-28 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-28 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-27 | JOHNSON COMPRESSOR STATION | MANDAREE, McKenzie, ND | Pass | U.S. EPA |
| 2026-05-27 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2026-05-27 | SOUTH FLORIDA MATERIALS CORP. DBA VECENE | MONTGOMERY, Montgomery, AL | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | MID-CONTINENT COAL AND COKE COMPANY | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-05-27 | UNIVERSITY OF ARKANSAS - FAYETTEVILLE CAMPUS | FAYETTEVILLE, Washington, AR | Pass | State |
| 2026-05-27 | APAC CENTRAL, INC. - JENNY LIND ASPHALT | GREENWOOD, Sebastian, AR | Pass | State |
| 2026-05-27 | APAC CENTRAL, INC. - JENNY LIND ASPHALT | GREENWOOD, Sebastian, AR | Pass | State |
| 2026-05-27 | QUIKJET - MONROE I & II TERMINALS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-05-27 | SALT RIVER PROJECT - KYRENE GENERATING STATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | AMERESCO DELAWARE ENERGY LLC - CENTRAL | SANDTOWN, Kent, DE | Pass | State |
| 2026-05-27 | WOLVERINE ADVANCED MATERIALS | LEESBURG, Lake, FL | Pass | State |
| 2026-05-27 | WOLVERINE ADVANCED MATERIALS | LEESBURG, Lake, FL | Pass | State |
| 2026-05-27 | ORLANDO UTILITIES COMMISSION | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-27 | ORLANDO UTILITIES COMMISSION | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-27 | ORLANDO UTILITIES COMMISSION | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-27 | ORLANDO UTILITIES COMMISSION | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-27 | ORLANDO UTILITIES COMMISSION | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-27 | ORLANDO UTILITIES COMMISSION | SAINT CLOUD, Osceola, FL | Pass | State |
| 2026-05-27 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-27 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-27 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-27 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-27 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-27 | WALTON COUNTY POWER LLC | MONROE, Walton, GA | Pass | State |
| 2026-05-27 | WALTON COUNTY POWER LLC | MONROE, Walton, GA | Pass | State |
| 2026-05-27 | KAMIN - EDGAR PLANT | MCINTYRE, Wilkinson, GA | Pass | State |
| 2026-05-27 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2026-05-27 | E.T. SIMONDS MATERIALS CO | MT VERNON, Jefferson, IL | Pass | State |
| 2026-05-27 | ZIMMERMAN ENERGY LLC — high-priority violation on file | ARGOS, Marshall, IN | Pass | State |
| 2026-05-27 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-27 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-27 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-27 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-27 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-27 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-27 | BONANZA BIOENERGY (AIR) | GARDEN CITY, Finney, KS | Pass | State |
| 2026-05-27 | ROHM & HAAS - LOUISVILLE PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-05-27 | NAVAL SUPPORT FACILITY, INDIAN HEAD — high-priority violation on file | INDIAN HEAD, Charles, MD | Fail | State |
| 2026-05-27 | HARFORD WASTE DISPOSAL CENTER | STREET, Harford, MD | Pass | State |
| 2026-05-27 | 3M HUTCHINSON | HUTCHINSON, McLeod, MN | Pass | State |
| 2026-05-27 | ME GLOBAL INC | DULUTH, St. Louis, MN | Pass | State |
| 2026-05-27 | DENCO II LLC | MORRIS, Stevens, MN | Pass | State |
| 2026-05-27 | SPECIALTY GRANULES | ANNAPOLIS, Iron, MO | Pass | State |
| 2026-05-27 | KENTUCKY TENNESSEE CLAY COMPANY, SLEDGE | CRENSHAW, Quitman, MS | Pass | State |
| 2026-05-27 | KENTUCKY TENNESSEE CLAY COMPANY, SLEDGE | CRENSHAW, Quitman, MS | Pass | State |
| 2026-05-27 | KENTUCKY TENNESSEE CLAY COMPANY, SLEDGE | CRENSHAW, Quitman, MS | Pass | State |
| 2026-05-27 | CARDINAL FG COMPANY | MOORESVILLE, Iredell, NC | Pending | State |
| 2026-05-27 | COLUMBIA PLYWOOD CORPORATION - COLUMBIA CAROLINA DIVISION | OLD FORT, McDowell, NC | Pending | State |
| 2026-05-27 | DUKE ENERGY PROGRESS, LLC - RICHMOND COUNTY TURBINES | HAMLET, Richmond, NC | Pending | State |
| 2026-05-27 | GRANITE RIDGE ENERGY, LLC | LONDONDERRY, Rockingham, NH | Incomplete | State |
| 2026-05-27 | OWENS-CORNING INSULATING SYSTEMS- FEURA BUSH | BETHLEHEM, Albany, NY | Pass | State |
| 2026-05-27 | EOG RESOURCES, INC. - HOLLYFIELD CR MON PAD | DELLROY, Carroll, OH | Pass | State |
| 2026-05-27 | EOG RESOURCES, INC. - HOLLYFIELD CR MON PAD | DELLROY, Carroll, OH | Pass | State |
| 2026-05-27 | EOG RESOURCES, INC. - HOLLYFIELD CR MON PAD | DELLROY, Carroll, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | ROVER PIPELINE - MAINLINE CS3 | CHATFIELD, TOWNSHIP OF, Crawford, OH | Pass | State |
| 2026-05-27 | EOG RESOURCES, INC. - GOODING CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-27 | EOG RESOURCES, INC. - GOODING CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-27 | EOG RESOURCES, INC. - GOODING CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-27 | SOUTHERN STAR CTL GAS PIPELINE INC / RATLIFF CITY COMPRESSOR STATION | RATLIFF CITY, Carter, OK | Pass | State |
| 2026-05-27 | UGI AUBURN GATHERING LLC/AUBURN COMP STA | AUBURN, Susquehanna, PA | Pass | State |
| 2026-05-27 | NEXTERA RENEWABLE FUELS LLC/LYCO LANDFILL LFGTE PLT | MONTGOMERY, Lycoming, PA | Pass | State |
| 2026-05-27 | NAVAL STATION NEWPORT | NEWPORT, Newport, RI | Pass | State |
| 2026-05-27 | KING ASPHALT INC - CONWAY — high-priority violation on file | CONWAY, Horry, SC | Pass | State |
| 2026-05-27 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2026-05-27 | HEBER LIGHT AND POWER COMPANY | HEBER CITY, Wasatch, UT | Pass | State |
| 2026-05-27 | PILGRIM'S PRIDE CORPORATION | EDINBURG, Shenandoah, VA | Pass | State |
| 2026-05-27 | CENTRIO (WESTERN) | SEATTLE, King, WA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.