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 |
|---|---|---|---|---|
| 2026-05-07 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2026-05-07 | HECO - SCHOFIELD — high-priority violation on file | WAHIAWA, Honolulu, HI | Pass | State |
| 2026-05-07 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-07 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-07 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-07 | HEIDELBERG MATERIALS US CEMENT LLC | LOGANSPORT, Cass, IN | Pass | State |
| 2026-05-07 | HEIDELBERG MATERIALS US CEMENT LLC | LOGANSPORT, Cass, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-07 | IPSWICH MUNICIPAL LIGHT | IPSWICH, Essex, MA | Pending | State |
| 2026-05-07 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-05-07 | RIVERSIDE CARBON SOLUTIONS - TURTLE LAKE CO2 | CHESTER TWP, Otsego, MI | Pass | State |
| 2026-05-07 | ADM - MARSHALL | MARSHALL, Lyon, MN | Pass | State |
| 2026-05-07 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-05-07 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-05-07 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-05-07 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-05-07 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-05-07 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2026-05-07 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-05-07 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-05-07 | BAKELITE CHEMICALS LLC, TAYLORSVILLE — high-priority violation on file | TAYLORSVILLE, Smith, MS | Pass | State |
| 2026-05-07 | YELLOWSTONE POWER PLANT — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-05-07 | BILLINGS TRANSPORTATION OPERATIONS | BILLINGS, Yellowstone, MT | Pass | State |
| 2026-05-07 | JORDAN LUMBER & SUPPLY, INC. | MT GILEAD (MONTGOMERY,NC), Montgomery, NC | Pending | State |
| 2026-05-07 | BUNCOMBE COUNTY LANDFILL II | ALEXANDER, Buncombe, NC | Pending | Local |
| 2026-05-07 | LONGWOOD - BOUGAINVILLE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-05-07 | RIPPLE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-05-07 | COTTON DRAW UNIT 25 CTB 5 & COTTON DRAW 25 CTB 4 | MALAGA, Eddy, NM | Pass | State |
| 2026-05-07 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-07 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-07 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-07 | EOG RESOURCES, INC - WEHR SPRING VALLEY FARM MH ELS PAD | BERLIN, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-05-07 | EOG RESOURCES, INC - WEHR SPRING VALLEY FARM MH ELS PAD | BERLIN, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-05-07 | EOG RESOURCES, INC - WEHR SPRING VALLEY FARM MH ELS PAD | BERLIN, TOWNSHIP OF, Mahoning, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | ENBRIDGE GAS OHIO - CHIPPEWA STATION | DOYLESTOWN, Wayne, OH | Pass | State |
| 2026-05-07 | POET BIOREFINING - LEIPSIC — high-priority violation on file | LEIPSIC, Putnam, OH | Fail | State |
| 2026-05-07 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-07 | AMG VANADIUM LLC — high-priority violation on file | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-05-07 | TARGA PIPELINE MIDCONTINENT WESTOK LLC / WAUKOMIS COMPRESSOR STATION | WAUKOMIS, Garfield, OK | Pass | State |
| 2026-05-07 | TARGA PIPELINE MIDCONTINENT WESTOK LLC / WAUKOMIS COMPRESSOR STATION | WAUKOMIS, Garfield, OK | Pass | State |
| 2026-05-07 | RW GATHERING LLC/ECKER BERGMAN RD COMP STA | DERRY TWP, Westmoreland, PA | Pass | State |
| 2026-05-07 | EXPAND OPERATING LLC/VALENTINE CPF 1 | CLIFFORD, Susquehanna, PA | Pass | State |
| 2026-05-07 | USS/CLAIRTON WORKS — high-priority violation on file | CLAIRTON, Allegheny, PA | Pass | Local |
| 2026-05-07 | SANTEE COOPER WINYAH GENERATING STATION | GEORGETOWN, Georgetown, SC | Pass | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Fail | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Pass | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Fail | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Pass | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Fail | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Fail | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Fail | State |
| 2026-05-07 | CORRIGAN OSB — high-priority violation on file | CORRIGAN, Polk, TX | Pass | State |
| 2026-05-07 | DOMINION/ODEC - CLOVER POWER STATION — high-priority violation on file | CLOVER, Halifax, VA | Pass | State |
| 2026-05-07 | VIRGINIA ELECTRIC AND POWER COMPANY, MT. STORM | MT. STORM, Grant, WV | Pass | State |
| 2026-05-07 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.