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 |
|---|---|---|---|---|
| 2026-02-12 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-12 | US NAVY - NSA HAMPTON ROADS HQ | NORFOLK, Norfolk (city), VA | Pass | State |
| 2026-02-12 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-12 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2026-02-12 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-12 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-12 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-12 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2026-02-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2026-02-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2026-02-12 | EAKIN COMPRESSOR STATION (MOUNTAIN WEST PIPELINE, LLC) | UINTA COUNTY, Uinta, WY | Pass | State |
| 2026-02-11 | OCCIDENTAL CHEMICAL CORPORATION | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-02-11 | OCCIDENTAL CHEMICAL CORPORATION | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2026-02-11 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2026-02-11 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2026-02-11 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2026-02-11 | ALABAMA POWER COMPANY | WILSONVILLE, Shelby, AL | Pass | State |
| 2026-02-11 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-11 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-11 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-2 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-02-11 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-2 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-02-11 | ENABLE GAS TRANSMISSION, LLC - COVE COMPRESSOR STATION | COVE, Polk, AR | Pass | State |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | E & J GALLO WINERY & BRANDY — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-02-11 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Fail | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | AMERESCO DELAWARE ENERGY - SOUTHERN | GEORGETOWN, Sussex, DE | Pass | State |
| 2026-02-11 | DUKE ENERGY FLORIDA, LLC | CRYSTAL RIVER, Citrus, FL | Pass | State |
| 2026-02-11 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-11 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-11 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-11 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-11 | U.S. SUGAR CORPORATION | CLEWISTON, Hendry, FL | Pass | State |
| 2026-02-11 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-11 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-02-11 | ROBINS AIR FORCE BASE | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-02-11 | ROBINS AIR FORCE BASE | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-02-11 | TOYOTA INDUSTRIES COMPRESSOR PARTS AMERICA, CO. | PENDERGRASS, Jackson, GA | Pass | State |
| 2026-02-11 | IPL-LIME CREEK COMBUSTION TURBINES | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-02-11 | LOPAREX INC | IOWA CITY, Johnson, IA | Pass | State |
| 2026-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2026-02-11 | NATURAL GAS PIPELINE CO OF AMERICA-#204 | COLUMBUS JUNCTION, Louisa, IA | Pass | State |
| 2026-02-11 | IROQUOIS BIO ENERGY COMPANY LLC — high-priority violation on file | RENSSELAER, Jasper, IN | Pass | State |
| 2026-02-11 | IROQUOIS BIO ENERGY COMPANY LLC — high-priority violation on file | RENSSELAER, Jasper, IN | Fail | State |
| 2026-02-11 | IROQUOIS BIO ENERGY COMPANY LLC — high-priority violation on file | RENSSELAER, Jasper, IN | Fail | State |
| 2026-02-11 | SILGAN CONTAINERS MANUFACTURING CORPORATION | HAMMOND, Lake, IN | Pass | State |
| 2026-02-11 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-11 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-11 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-11 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-11 | OWENSBORO GRAIN EDIBLE OILS | OWENSBORO, Daviess, KY | Pass | State |
| 2026-02-11 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-02-11 | PINE TREE ACRES, INC. | LENOX TOWNSHIP, Macomb, MI | Pass | State |
| 2026-02-11 | BCP INGREDIENTS | VERONA, Lawrence, MO | N/A | U.S. EPA |
| 2026-02-11 | RICHARD ABERNATHY GRADING AND SEPTIC, INC. - MT. ULLA SITE | MOORESVILLE, Iredell, NC | Pass | State |
| 2026-02-11 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-02-11 | EAGLE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-11 | EAGLE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-11 | SILVER BULLET 16-21 BATTERY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-11 | MAMA JO TB | LOVING, Eddy, NM | Pass | State |
| 2026-02-11 | JAL NO3 GAS PLANT | JAL, Lea, NM | Pass | State |
| 2026-02-11 | JAL NO3 GAS PLANT | JAL, Lea, NM | Pass | State |
| 2026-02-11 | AZTEC COMPRESSOR STATION — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2026-02-11 | AZTEC COMPRESSOR STATION — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2026-02-11 | PERSEUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-02-11 | PERSEUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-02-11 | JADE 34-3 FED COM BATTERY | MONUMENT, Lea, NM | Pass | State |
| 2026-02-11 | SMOKY VALLEY COMMON OPERATION — high-priority violation on file | ROUND MOUNTAIN, Nye, NV | Pass | State |
| 2026-02-11 | PRO TERMINAL OPERATORS, LLC LAS VEGAS TERMINAL | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-11 | HONDA DEV & MFG OF AMERICA, LLC, MARYSVILLE AUTO PLANT — high-priority violation on file | MARYSVILLE, Union, OH | Pass | State |
| 2026-02-11 | ENBRIDGE GAS OHIO - AUGUSTA COMPRESSOR STATION | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-02-11 | ENBRIDGE GAS OHIO - AUGUSTA COMPRESSOR STATION | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-02-11 | ENBRIDGE GAS OHIO - AUGUSTA COMPRESSOR STATION | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-02-11 | ENBRIDGE GAS OHIO - AUGUSTA COMPRESSOR STATION | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-02-11 | ENBRIDGE GAS OHIO - AUGUSTA COMPRESSOR STATION | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-02-11 | ENBRIDGE GAS OHIO - AUGUSTA COMPRESSOR STATION | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
| 2026-02-11 | EQM OLYMP MIDSTM GOLIATH, GODZILLA FORTRESS CMPRSR STNS | BEALLSVILLE, Monroe, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.