EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2025-09-12 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2025-09-12 | THOMAS SIMPSON CONSTRUCTION - ACI | NEWPORT, Carteret, NC | Pass | State |
| 2025-09-12 | GLOBAL CELLULOSE FIBERS - RIEGELWOOD MILL | RIEGELWOOD, Columbus, NC | Pending | State |
| 2025-09-12 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | N/A | State |
| 2025-09-12 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | Pass | State |
| 2025-09-12 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | Pass | State |
| 2025-09-12 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | Pass | State |
| 2025-09-12 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | N/A | State |
| 2025-09-12 | ASH GROVE CEMENT CO — high-priority violation on file | LOUISVILLE, Cass, NE | Pass | State |
| 2025-09-12 | GREENAMERICA BIOFUELS ORD LLC | ORD, Valley, NE | Pass | State |
| 2025-09-12 | AQUEDUCT COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-09-12 | OXY - CEDAR CANYON EAST COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-12 | OXY - CEDAR CANYON EAST COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-12 | OXY - CEDAR CANYON EAST COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-12 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-12 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-12 | BASKIN LIVESTOCK | BATAVIA, Genesee, NY | Fail | State |
| 2025-09-12 | NORPLAS INDUSTRIES INC. | NORTHWOOD, Wood, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Fail | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-09-12 | EOG RESOURCES, INC. - SHUGERT GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-09-12 | EOG RESOURCES, INC. - SHUGERT GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-09-12 | EOG RESOURCES, INC. - SHUGERT GY CEN PAD | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2025-09-12 | ARCONIC US LLC/LANCASTER — high-priority violation on file | LANCASTER, Lancaster, PA | Pass | State |
| 2025-09-12 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2025-09-12 | PUROLITE INC/MFG CHEM — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Fail | Local |
| 2025-09-12 | HONEYWELL SAFETY PRODUCTS — high-priority violation on file | CLOVER, York, SC | Fail | State |
| 2025-09-12 | HUBER ENGINEERED WOODS, LLC | SPRING CITY, Rhea, TN | Pass | State |
| 2025-09-12 | THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER AT DALLAS | DALLAS, Dallas, TX | Pass | State |
| 2025-09-12 | SPENCER STATION | DENTON, Denton, TX | Pass | State |
| 2025-09-12 | SPENCER STATION | DENTON, Denton, TX | Pass | State |
| 2025-09-12 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2025-09-12 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2025-09-12 | HOWARD COMPRESSOR STATION | ATHENS, Ellis, TX | Pass | State |
| 2025-09-12 | WOLF HOLLOW I | GRANBURY, Hood, TX | Pass | State |
| 2025-09-12 | WOLF HOLLOW I | GRANBURY, Hood, TX | Pass | State |
| 2025-09-12 | WHITE SETTLEMENT COMPRESSOR STATION | FORT WORTH, Parker, TX | Pass | State |
| 2025-09-12 | HARBOUR INDUSTRIES LLC | SHELBURNE, Chittenden, VT | Pass | State |
| 2025-09-12 | APPALACHIA MIDSTREAM SERVICES, L.L.C., PLEASANTS | ADALINE, Marshall, WV | Pass | State |
| 2025-09-12 | CNX MIDSTREAM OPERATING COMPANY LLC, SHIRLEY STATION | ALMA, Tyler, WV | Pass | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-09-11 | UNIVERSITY OF ALASKA / UNIVERSITY OF ALASKA FAIRBANKS CAMPUS — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-09-11 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2025-09-11 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2025-09-11 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2025-09-11 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2025-09-11 | PARAGOULD CITY LIGHT & WATER | PARAGOULD, Greene, AR | Pass | State |
| 2025-09-11 | PARAGOULD CITY LIGHT & WATER | PARAGOULD, Greene, AR | Pass | State |
| 2025-09-11 | PARAGOULD CITY LIGHT & WATER | PARAGOULD, Greene, AR | Pass | State |
| 2025-09-11 | DESOTO GATHERING COMPANY, LLC - HAMMERHEAD CPF-1 | JUDSONIA, White, AR | Pass | State |
| 2025-09-11 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2025-09-11 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-09-11 | LOMA LINDA UNIVERSITY | LOMA LINDA, San Bernardino, CA | Pass | Local |
| 2025-09-11 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-11 | INGOMAR PACKING COMPANY | LOS BANOS, Merced, CA | Pass | Local |
| 2025-09-11 | INGOMAR PACKING COMPANY | LOS BANOS, Merced, CA | Pass | Local |
| 2025-09-11 | INGOMAR PACKING COMPANY | LOS BANOS, Merced, CA | Pass | Local |
| 2025-09-11 | INGOMAR PACKING COMPANY | LOS BANOS, Merced, CA | Pass | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-11 | CITY OF GLENWOOD SPRINGS | GLENWOOD SPRINGS 3.2 MI. W OF, Garfield, CO | Pass | State |
| 2025-09-11 | ROEHM AMERICA, LLC — high-priority violation on file | WALLINGFORD, New Haven, CT | Pass | State |
| 2025-09-11 | SOLVENTUM PURIFICATION, INC | MERIDEN, New Haven, CT | Pass | State |
| 2025-09-11 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - JEWETT CITY SITE — high-priority violation on file | GRISWOLD, New London, CT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.