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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.