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 |
|---|---|---|---|---|
| 2026-04-15 | EXPAND OPERATING LLC/TIFFANY WYO PAD | LACEYVILLE, Wyoming, PA | Pending | State |
| 2026-04-15 | RUSSO, B. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pending | State |
| 2026-04-15 | HP HOOD LLC | WINCHESTER, Frederick, VA | Pass | State |
| 2026-04-15 | WMWI - OMEGA HILLS LANDFILL | GERMANTOWN, Waukesha, WI | Pass | State |
| 2026-04-15 | QUIKRETE CONSTRUCTION MATERIALS, LLC, QUIKRETE CEMENT — high-priority violation on file | MARTINSBURG, Berkeley, WV | Pass | State |
| 2026-04-14 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-04-14 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-04-14 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-04-14 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-2 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-04-14 | DESOTO GATHERING COMPANY LLC - YELLOWSTONE CPF-2 | QUITMAN, Van Buren, AR | Pass | State |
| 2026-04-14 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-04-14 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2026-04-14 | GCC RIO GRANDE - PUEBLO CEMENT PLANT — high-priority violation on file | PUEBLO 4.5 MI. S OF, Pueblo, CO | Pass | State |
| 2026-04-14 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2026-04-14 | DCP OPERATING CO - NORTHSTAR C.S. | EATON 3.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-14 | DCP OPERATING CO - NORTHSTAR C.S. | EATON 3.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-14 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-14 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-14 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-14 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-14 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-14 | NEENAH FOUNDRY COMPANY | MEDLEY, Miami-Dade, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | STERICYCLE, INC | APOPKA, Orange, FL | Pass | State |
| 2026-04-14 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-14 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-14 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-14 | TROJAN BATTERY COMPANY, LLC | LITHONIA, DeKalb, GA | Pass | State |
| 2026-04-14 | SSC AUGUSTA, LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-04-14 | SSC AUGUSTA, LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-04-14 | SSC AUGUSTA, LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-04-14 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-04-14 | PELLA CORP-SIOUX CENTER DIV | SIOUX CENTER, Sioux, IA | Pass | State |
| 2026-04-14 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-14 | DES MOINES METRO WRA | DES MOINES, Polk, IA | Pass | Local |
| 2026-04-14 | CLARIOS LLC | GENEVA, Kane, IL | Fail | State |
| 2026-04-14 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-14 | CLARIOS LLC | GENEVA, Kane, IL | Pass | State |
| 2026-04-14 | ADVOCATE SHERMAN HOSPITAL | ELGIN, Kane, IL | Pass | State |
| 2026-04-14 | ADVOCATE SHERMAN HOSPITAL | ELGIN, Kane, IL | Pass | State |
| 2026-04-14 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | OWENSVILLE, Gibson, IN | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC GYPSUM LLC — high-priority violation on file | WHEATFIELD, Jasper, IN | Pass | State |
| 2026-04-14 | POLY-WOOD LLC — high-priority violation on file | SYRACUSE, Kosciusko, IN | Pass | State |
| 2026-04-14 | POLY-WOOD LLC — high-priority violation on file | SYRACUSE, Kosciusko, IN | Pass | State |
| 2026-04-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-04-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-04-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-04-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-04-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-04-14 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-04-14 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-14 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-14 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-14 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-14 | HOWMET CASTINGS AND SERVICES INCORPORATED | LA PORTE, LaPorte, IN | Pass | State |
| 2026-04-14 | BLACKFOOT POWER GENERATING STATION | WINSLOW, Pike, IN | Pass | State |
| 2026-04-14 | BLACKFOOT POWER GENERATING STATION | WINSLOW, Pike, IN | Pass | State |
| 2026-04-14 | BLACKFOOT POWER GENERATING STATION | WINSLOW, Pike, IN | Pass | State |
| 2026-04-14 | CALGON CARBON CORPORATION | CATLETTSBURG, Boyd, KY | Pass | State |
| 2026-04-14 | UMASS AMHERST CAMPUS | AMHERST, Hampshire, MA | Pending | State |
| 2026-04-14 | TENNESSEE GAS PIPELINE STATION 261 | AGAWAM, Hampden, MA | Pending | State |
| 2026-04-14 | LEHIGH CEMENT COMPANY - UNION BRIDGE | UNION BRIDGE, Carroll, MD | Pass | State |
| 2026-04-14 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-04-14 | COREWELL HEALTH - BUTTERWORTH CAMPUS | GRAND RAPIDS, Kent, MI | Pass | State |
| 2026-04-14 | SEMCO ENERGY GAS COMPANY - MORTON WELLS FACILITY | MARYSVILLE, St. Clair, MI | Pass | State |
| 2026-04-14 | NORTHERN NATURAL GAS CO - NORTH BRANCH | HARRIS, Chisago, MN | Pass | State |
| 2026-04-14 | AMERICAN CRYSTAL SUGAR - EAST GRAND FORKS | EAST GRAND FORKS, Polk, MN | Pass | State |
| 2026-04-14 | CHEVRON USA INC, CHEVRON PRODUCTS COMPANY, PASCAGOULA REFINERY | PASCAGOULA, Jackson, MS | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-04-14 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2026-04-14 | MARTIN MARIETTA MATERIALS, INC. - EAST ALAMANCE QUARRY | BURLINGTON, Alamance, NC | Pass | State |
| 2026-04-14 | CAROLINAS MEDICAL CENTER | CHARLOTTE, Mecklenburg, NC | Pass | Local |
| 2026-04-14 | NORTHERN NATURAL GAS COMPANY | FREMONT, Dodge, NE | N/A | State |
| 2026-04-14 | REDTAIL COMPRESSOR STATION | BUSHNELL, Kimball, NE | Pass | State |
| 2026-04-14 | TIGER 14 FACILITY — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-04-14 | BIG SINKS COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-14 | BIG SINKS COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-14 | BEDROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-04-14 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-04-14 | BRININSTOOL COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-04-14 | AUGUSTA COMPRESSOR FACILITY- UTICA GAS SERVICES, L.L.C. | EAST, TOWNSHIP OF, Carroll, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.