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 |
|---|---|---|---|---|
| 2026-07-08 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-08 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-08 | METALS AND ADDITIVES LLC — high-priority violation on file | BRAZIL, Clay, IN | Pass | State |
| 2026-07-08 | ANR PIPELINE COMPANY LAGRANGE COMPRESSOR STATION — high-priority violation on file | LAGRANGE, LaGrange, IN | Pass | State |
| 2026-07-08 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-08 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-08 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-08 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-08 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-08 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-08 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-08 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-08 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-08 | BUCKEYE TERMINALS LLC EAST CHICAGO TERMINAL | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-08 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Fail | State |
| 2026-07-08 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-07-08 | JOHNS HOPKINS HOSPITAL — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2026-07-08 | MCGILL ROAD LANDFILL | JACKSON, Jackson, MI | Pass | State |
| 2026-07-08 | LINCOLN COUNTY LANDFILL (ACI) | CROUSE, Lincoln, NC | Pass | State |
| 2026-07-08 | WHELAN ENERGY CENTER — high-priority violation on file | HASTINGS, Adams, NE | N/A | State |
| 2026-07-08 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | N/A | State |
| 2026-07-08 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2026-07-08 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2026-07-08 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2026-07-08 | JOHNS MANVILLE | DEFIANCE, Defiance, OH | Pass | State |
| 2026-07-08 | MAR-ZANE, INC. PLANT #21 | MANSFIELD, Richland, OH | Pass | State |
| 2026-07-08 | PA STATE UNIV/MILTON S HERSHEY MED CTR | HERSHEY, Dauphin, PA | Pass | State |
| 2026-07-08 | SUSQUEHANNA GATHERING/NORTH RANGE CPF 1 COMP STA | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2026-07-08 | EFFINGHAM PELLETS LLC — high-priority violation on file | EFFINGHAM, Florence, SC | Pending | State |
| 2026-07-08 | CORRCHOICE LLC | AMHERST, Amherst, VA | Pending | State |
| 2026-07-08 | PANELTECH — high-priority violation on file | HOQUIAM, Grays Harbor, WA | Pending | Local |
| 2026-07-08 | WE ENERGIES-OAK CREEK POWER PLANT — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-07-08 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-07 | AM/NS CALVERT LLC | CALVERT, Mobile, AL | Pass | State |
| 2026-07-07 | SSAB ALABAMA INC | AXIS, Mobile, AL | Pass | State |
| 2026-07-07 | SSAB ALABAMA INC | AXIS, Mobile, AL | Pass | State |
| 2026-07-07 | RENO REFRACTORIES, INC. | MORRIS, Jefferson, AL | Pending | Local |
| 2026-07-07 | DESOTO GATHERING COMPANY, LLC - NORTH YELLOWSTONE CPF-2 | BEE BRANCH, Van Buren, AR | Fail | State |
| 2026-07-07 | DESOTO GATHERING COMPANY, LLC - SOUTHWEST GREER LAKE CPF-5 | CLINTON, Van Buren, AR | Fail | State |
| 2026-07-07 | SOUTHWESTERN ELECTIRC POWER COMPANY - HARRY D. MATTISON POWER PLANT | TONTITOWN, Washington, AR | Pass | State |
| 2026-07-07 | GILA RIVER POWER STATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BRONCO WINE COMPANY | CERES, Stanislaus, CA | Pass | Local |
| 2026-07-07 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2026-07-07 | BONANZA CREEK - ANTELOPE CPF 13-21 | KERSEY 10.4 MI. E OF, Weld, CO | Pass | State |
| 2026-07-07 | CITY OF GAINESVILLE, GRU — high-priority violation on file | GAINESVILLE, Alachua, FL | Pass | State |
| 2026-07-07 | CITY OF FARMER CITY POWER PLANT | FARMER CITY, De Witt, IL | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | RESCO PRODUCTS INCORPORATED | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | RESCO PRODUCTS INCORPORATED | HAMMOND, Lake, IN | Pass | State |
| 2026-07-07 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-07 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-07 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-07-07 | PYRAMID PAVING & CONTRACTING CO. | ESSEXVILLE, Bay, MI | Pass | State |
| 2026-07-07 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2026-07-07 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2026-07-07 | CARGILL INC — high-priority violation on file | BLAIR, Washington, NE | N/A | State |
| 2026-07-07 | HEP PENNSYLVANIA GATHERING LLC/CLARK CPF 1 COMP STA | WYSOX, Bradford, PA | Pass | State |
| 2026-07-07 | SHAW INDUSTRIES GROUP INC PLANT 8S | COLUMBIA, Lexington, SC | Pending | State |
| 2026-07-07 | SATTERFIELD CONSTRUCTION CO INC STONEY POINT PLANT | GREENWOOD, Greenwood, SC | Pass | State |
| 2026-07-07 | RIPLEY POWER & LIGHT | RIPLEY, Lauderdale, TN | Pass | State |
| 2026-07-07 | REAL ALLOYING RECYCLING, LLC | LOUDON, Loudon, TN | Pass | State |
| 2026-07-07 | LINHART CENTRAL FACILITY | KARNES CITY, Karnes, TX | N/A | State |
| 2026-07-07 | BLAIR ASPHALT LLC | SUFFOLK, Suffolk (city), VA | Pending | State |
| 2026-07-07 | WPL - SHEBOYGAN FALLS ENERGY FACILITY | PLYMOUTH, Taylor, WI | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-07 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2026-07-07 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.