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 |
|---|---|---|---|---|
| 2026-03-19 | WATEREE STATION | EASTOVER, Richland, SC | Pass | State |
| 2026-03-19 | TENNESSEE VALLEY AUTHORITY - CUMBERLAND FOSSIL PLANT — high-priority violation on file | CUMBERLAND CITY, Stewart, TN | Pass | State |
| 2026-03-19 | COLUMBIA GAS TRANSMISSION, LLC, GLENVILLE | TRUEBADA, Gilmer, WV | Pass | State |
| 2026-03-19 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-03-18 | NUCOR STEEL DECATUR LLC | TRINITY, Morgan, AL | Pass | State |
| 2026-03-18 | EL PASO NATURAL GAS CO - SELIGMAN COMPRESSOR STATION | SELIGMAN, Yavapai, AZ | Pass | State |
| 2026-03-18 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-18 | USMC - AGCC 29 PALMS | TWENTYNINE PALMS, San Bernardino, CA | Pass | Local |
| 2026-03-18 | TESORO REFINING AND MARKETING CO — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2026-03-18 | LA CITY, SANITATION BUREAU (HTP) | PLAYA DEL REY, Los Angeles, CA | Pass | Local |
| 2026-03-18 | QB ENERGY - E28OU SWD FACILITY | DE BEQUE 2.7 MI. N OF, Garfield, CO | N/A | State |
| 2026-03-18 | COVALENCE DJ, LLC - BIGFOOT 11 | KERSEY AREA, Weld, CO | Fail | State |
| 2026-03-18 | ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION | CHAPLIN, Windham, CT | Pass | State |
| 2026-03-18 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-03-18 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-18 | EMORY UNIVERSITY | ATLANTA, DeKalb, GA | Pass | State |
| 2026-03-18 | SOUTHERN NATURAL GAS COMPANY, LLC - THOMASTON COMPRESSOR STATION | THOMASTON, Upson, GA | Pass | State |
| 2026-03-18 | INTEGRATED DNA TECHNOLOGIES | CORALVILLE, Johnson, IA | Pass | State |
| 2026-03-18 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2026-03-18 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2026-03-18 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-03-18 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-03-18 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2026-03-18 | DUKE ENERGY INDIANA LLC EDWARDSPORT GENERATING STATION | EDWARDSPORT, Knox, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | DALTON CORPORATION WARSAW MANUFACTURING FACILITY — high-priority violation on file | WARSAW, Kosciusko, IN | Pass | State |
| 2026-03-18 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-18 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-18 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-18 | CARMEUSE LIME INCORPORATED — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2026-03-18 | DUKE ENERGY INDIANA LLC CAYUGA GENERATING STATION — high-priority violation on file | CAYUGA, Vermillion, IN | Pass | State |
| 2026-03-18 | DUKE ENERGY INDIANA LLC CAYUGA GENERATING STATION — high-priority violation on file | CAYUGA, Vermillion, IN | Pass | State |
| 2026-03-18 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-03-18 | NORTH AMERICAN STAINLESS | GHENT, Carroll, KY | Pass | State |
| 2026-03-18 | KY UTILITIES CO - BROWN STATION | HARRODSBURG, Mercer, KY | Pass | State |
| 2026-03-18 | DOW SILICONES CORPORATION | MIDLAND, Midland, MI | Pass | State |
| 2026-03-18 | CONSUMERS ENERGY - ST. CLAIR COMPRESSOR STATION | IRA, St. Clair, MI | Pass | State |
| 2026-03-18 | BUCKEYE PARTNER'S, L.P. EAST TERMINAL | TAYLOR, Wayne, MI | Pass | State |
| 2026-03-18 | CONSUMERS ENERGY - WHITE PIGEON COMPRESSOR STATION — high-priority violation on file | WHITE PIGEON, St. Joseph, MI | Pass | State |
| 2026-03-18 | CONSUMERS ENERGY - WHITE PIGEON COMPRESSOR STATION — high-priority violation on file | WHITE PIGEON, St. Joseph, MI | Pass | State |
| 2026-03-18 | BREMBO NORTH AMERICA, INC. — high-priority violation on file | HOMER, Calhoun, MI | Pass | State |
| 2026-03-18 | WEST FRASER US EWP - BEMIDJI | SOLWAY, Beltrami, MN | Pass | State |
| 2026-03-18 | UNITED TACONITE LLC - FAIRLANE PLANT | FORBES, St. Louis, MN | Pass | State |
| 2026-03-18 | TOPPAN PACKAGING USA (HICKORY) INC. | HICKORY, Catawba, NC | Pass | State |
| 2026-03-18 | GREEN PLAINS WOOD RIVER LLC — high-priority violation on file | WOOD RIVER, Hall, NE | N/A | State |
| 2026-03-18 | NE RENEWABLE POWER WHITEFIELD | WHITEFIELD, Coos, NH | Pass | State |
| 2026-03-18 | RJ CHIPPING ENTERPRISES, INC. | SHELBURNE, Coos, NH | Pass | State |
| 2026-03-18 | RJ CHIPPING ENTERPRISES, INC. | SHELBURNE, Coos, NH | Pass | State |
| 2026-03-18 | HUMIDOR COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-03-18 | CORONA COMPRESSOR STATION | CORONA, Lincoln, NM | Pass | State |
| 2026-03-18 | SFPP,L.P. (FRMLY KINDER-MORGAN ENERGY) | SPARKS, Washoe, NV | Pass | Local |
| 2026-03-18 | OWENS CORNING INSULATING SYSTEMS, LLC | NEWARK, Licking, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-SCHEEL PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-SCHEEL PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-SCHEEL PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-FAIRMONT PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-FAIRMONT PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-03-18 | HILCORP ENERGY - ELK RUN-FAIRMONT PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-03-18 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-18 | CARGILL, INC. - DAYTON | DAYTON, Montgomery, OH | Pass | State |
| 2026-03-18 | NORTHAMPTON GEN CO/NORTHAMPTON | NORTHAMPTON, Northampton, PA | Pass | State |
| 2026-03-18 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2026-03-18 | LAUREL MTN MIDSTREAM OPR LLC/CANTARAL COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2026-03-18 | NFG MIDSTREAM TROUT RUN LLC/BODINE COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-03-18 | WASTE MANAGEMENT, INC. OF TENNESSEE | HEISKELL, Anderson, TN | Pass | State |
| 2026-03-18 | DOMTAR PAPER COMPANY, LLC | KINGSPORT, Sullivan, TN | Pass | State |
| 2026-03-18 | KENNECOTT MAIN STACK, SMELTER AND | BINGHAM CANYON, Salt Lake, UT | Pass | State |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | HAMPTON LUMBER MILLS-WASHINGTON INC | DARRINGTON, Snohomish, WA | Pass | Local |
| 2026-03-18 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-03-17 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2026-03-17 | CHEROKEE SANITARY LANDFILL COMPANY | CHEROKEE VILLAGE, Fulton, AR | Pass | State |
| 2026-03-17 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-03-17 | DESOTO GATHERING COMPANY LLC. - SOUTHWEST GREER LAKE CPF-3 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-03-17 | EL PASO NATURAL GAS CO - WILLIAMS COMPRESSOR STATION | WILLIAMS, Coconino, AZ | Pass | State |
| 2026-03-17 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2026-03-17 | ALLIED WASTE SYSTEMS-FOOTHILLS LANDFILL | ARVADA AREA, Jefferson, CO | Pass | State |
| 2026-03-17 | QB ENERGY OPERATING - C17OU SWD | DEBEQUE 4.2 MI. E OF, Mesa, CO | N/A | State |
| 2026-03-17 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2026-03-17 | EXTRACTION - ARDREY PRODUCTION FACILITY | EVANS AREA, Weld, CO | Pass | State |
| 2026-03-17 | EXTRACTION - ARDREY PRODUCTION FACILITY | EVANS AREA, Weld, CO | Pass | State |
| 2026-03-17 | ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION | CHAPLIN, Windham, CT | Pass | State |
| 2026-03-17 | ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION | CHAPLIN, Windham, CT | Pass | State |
| 2026-03-17 | PREFERRED MATERIALS, INC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
| 2026-03-17 | UNITED STATES AIR FORCE | OKALOOSA COUNTY, Okaloosa, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.