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 |
|---|---|---|---|---|
| 2026-02-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-02-09 | ROBINS AIR FORCE BASE | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-02-09 | KAUAI ISLAND UTILITY - KAPAIA — high-priority violation on file | LIHUE, Kauai, HI | Pass | State |
| 2026-02-09 | FORD MOTOR COMPANY KENTUCKY TRUCK PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-02-09 | CONTINENTAL COAL- WALNUT CREEK | RICH HILL, Bates, MO | Pass | State |
| 2026-02-09 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2026-02-09 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2026-02-09 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-02-09 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-02-09 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-02-09 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | N/A | State |
| 2026-02-09 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | N/A | State |
| 2026-02-09 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2026-02-09 | DR. SCRIVNER FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-02-09 | SPARTAN COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-02-09 | SPARTAN COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-02-09 | EUNICE GAS PROCESSING PLANT — high-priority violation on file | EUNICE, Lea, NM | Pass | State |
| 2026-02-09 | FLORENCE STATE 23 FACILITY | JAL, Lea, NM | Pass | State |
| 2026-02-09 | MAESTRO COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-09 | MAESTRO COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-09 | DIVERSIFIED PROD LLC/BROOKVILLE SOUTH COMP STA | BROOKVILLE, Jefferson, PA | Pass | State |
| 2026-02-09 | XTO ENERGY INC/WINSLOW | REYNOLDSVILLE, Jefferson, PA | Pass | State |
| 2026-02-09 | RANGE RESOURCES APPALACHIA LLC/LAUREL HILL G | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-02-09 | MARKWEST LIBERTY MIDSTREAM/TIMBERLAKE COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2026-02-09 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-02-09 | CEDAR GROVE COMPOSTING, INC | EVERETT, Snohomish, WA | Fail | Local |
| 2026-02-09 | UW MADISON CHARTER STREET HEATING PLANT (DOA) | MADISON, Dane, WI | Pass | State |
| 2026-02-09 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-09 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-09 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-09 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-02-08 | VIRGINIA ELECTRIC AND POWER COMPANY, MT. STORM | MT. STORM, Grant, WV | Pass | State |
| 2026-02-07 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-02-06 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-3 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-02-06 | DESOTO GATHERING COMPANY, LLC - NEW QUITMAN CPF-2 | QUITMAN, Faulkner, AR | Pass | State |
| 2026-02-06 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Pass | State |
| 2026-02-06 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Pass | State |
| 2026-02-06 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Pass | State |
| 2026-02-06 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Pass | State |
| 2026-02-06 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | C W US INC - MISSION BELL WINERY | MADERA, Madera, CA | Pass | Local |
| 2026-02-06 | FLORIDA POWER & LIGHT COMPANY | OKEECHOBEE, Okeechobee, FL | Pass | State |
| 2026-02-06 | MOSAIC FERTILIZER, LLC — high-priority violation on file | BARTOW, Polk, FL | Pass | State |
| 2026-02-06 | STANDARD SAND & SILICA COMPANY | LAKE WALES, Polk, FL | Pass | State |
| 2026-02-06 | SEMINOLE ELECTRIC COOPERATIVE, INC. | PALATKA, Putnam, FL | Pass | State |
| 2026-02-06 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-06 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-06 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-06 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-06 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-06 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-06 | PURDUE UNIVERSITY — high-priority violation on file | WEST LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-02-06 | PURDUE UNIVERSITY — high-priority violation on file | WEST LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-02-06 | PURDUE UNIVERSITY — high-priority violation on file | WEST LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-02-06 | PURDUE UNIVERSITY — high-priority violation on file | WEST LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-02-06 | PURDUE UNIVERSITY — high-priority violation on file | WEST LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-02-06 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-02-06 | ARAPAHOE PARK COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-02-06 | RICO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-02-06 | COMANCHE PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-02-06 | GREYLOCK PRODUCTION LLC/BEACON WELL PAD | WAYNESBURG, Greene, PA | Pass | State |
| 2026-02-06 | GODLEY PLANT | GODLEY, Johnson, TX | Pass | State |
| 2026-02-06 | R W MILLER PLANT | PALO PINTO, Palo Pinto, TX | Pass | State |
| 2026-02-06 | R W MILLER PLANT | PALO PINTO, Palo Pinto, TX | Pass | State |
| 2026-02-05 | SALEM LANDFILL | OPELIKA, Lee, AL | Pass | State |
| 2026-02-05 | ENTERGY ARKANSAS, LLC - WHITE BLUFF PLANT | REDFIELD, Jefferson, AR | Pass | State |
| 2026-02-05 | DESOTO GATHERING COMPANY LLC. - SOUTHWEST GREER LAKE CPF-3 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-02-05 | DESOTO GATHERING COMPANY, LLC - NORTH YELLOWSTONE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-02-05 | WES DJ GAS PROC - WATTENBERG PLANT | AURORA, Adams, CO | Pass | State |
| 2026-02-05 | FLORIDA POWER & LIGHT COMPANY | OKEECHOBEE, Okeechobee, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2026-02-05 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-02-05 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-02-05 | SEMINOLE ELECTRIC COOPERATIVE, INC. | PALATKA, Putnam, FL | Pass | State |
| 2026-02-05 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-05 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-05 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-02-05 | GIW INDUSTRIES, INC. | GROVETOWN, Columbia, GA | Pass | State |
| 2026-02-05 | GINGER WEST DATA CENTER | CITY OF WEST DES MOINES, Dallas, IA | Pass | State |
| 2026-02-05 | GINGER WEST DATA CENTER | CITY OF WEST DES MOINES, Dallas, IA | Pass | State |
| 2026-02-05 | CLEVELAND-CLIFFS STEEL LLC — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-02-05 | CLEVELAND-CLIFFS STEEL LLC — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-02-05 | LOUISVILLE GAS & ELECTRIC COMPANY, MILL CREEK GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-02-05 | DTE GAS COMPANY - BELLE RIVER MILLS COMPRESSOR STATION | CHINA, St. Clair, MI | Pass | State |
| 2026-02-05 | GENERAL MOTORS LLC | WENTZVILLE, St. Charles, MO | N/A | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.