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 |
|---|---|---|---|---|
| 2026-05-21 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Fail | State |
| 2026-05-21 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-21 | POWDER PROCESSING TECHNOLOGY LLC — high-priority violation on file | VALPARAISO, Porter, IN | Pass | State |
| 2026-05-21 | BIG RIVERS ELECTRIC CORP - DB WILSON STATION — high-priority violation on file | CENTERTOWN, Ohio, KY | Pass | State |
| 2026-05-21 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-05-21 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-05-21 | SHAKOPEE MDEWAKANTON SIOUX COMMUNITY ORGANIC RECYCLING FACILITY | SHAKOPEE, Scott, MN | N/A | State |
| 2026-05-21 | HEARTLAND TRUSS | PLATTSBURG, Clinton, MO | Pass | State |
| 2026-05-21 | HEARTLAND TRUSS | PLATTSBURG, Clinton, MO | Pass | State |
| 2026-05-21 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-05-21 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2026-05-21 | FIRSTHEALTH OF THE CAROLINAS - MOORE REGIONAL HOSPITAL | PINEHURST, Moore, NC | Pending | State |
| 2026-05-21 | DUNBAR COMPRESSOR STATION | WINDSOR, Broome, NY | Pass | State |
| 2026-05-21 | CARMEUSE LIME, INC - GRAND RIVER OPERATIONS — high-priority violation on file | GRAND RIVER, Lake, OH | Pass | State |
| 2026-05-21 | CARMEUSE LIME, INC - GRAND RIVER OPERATIONS — high-priority violation on file | GRAND RIVER, Lake, OH | Pass | State |
| 2026-05-21 | CARMEUSE LIME, INC - GRAND RIVER OPERATIONS — high-priority violation on file | GRAND RIVER, Lake, OH | Pass | State |
| 2026-05-21 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-21 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-21 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-21 | THE ANDERSONS RENEWABLES LLC - GREENVILLE PLANT — high-priority violation on file | GREENVILLE, Darke, OH | Fail | State |
| 2026-05-21 | THE ANDERSONS RENEWABLES LLC - GREENVILLE PLANT — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2026-05-21 | BAYER HEALTHCARE LLC/MYERSTOWN | MYERSTOWN, Lebanon, PA | Pass | State |
| 2026-05-21 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | EVANS CITY, Butler, PA | Pass | State |
| 2026-05-21 | NORTHEAST WPCP/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-05-21 | MANCHESTER STREET, LLC | PROVIDENCE, Providence, RI | Pass | State |
| 2026-05-21 | VULCAN CONSTRUCTION MATERIALS LLC LIBERTY QUARRY | LIBERTY, Pickens, SC | Pass | State |
| 2026-05-21 | C R JACKSON INC FLORENCE PLANT #418 — high-priority violation on file | FLORENCE, Florence, SC | Pass | State |
| 2026-05-21 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-05-21 | EAST KARNES CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-05-21 | BATTLE HORSE PLANT | BRENHAM, Washington, TX | Pass | State |
| 2026-05-21 | GRANGER SODA ASH FACILITY (WE SODA WYOMING LP) | GRANGER, Sweetwater, WY | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-05-21 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-05-20 | DOYON UTILITIES, LLC / DU-JBER-ELECTRIC, GAS, DRINKING WATER A | ANCHORAGE, Anchorage Municipality, AK | Pass | State |
| 2026-05-20 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-05-20 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-05-20 | GREEN BAY PACKAGING, INC. - ARKANSAS KRAFT DIVISION | MORRILTON, Conway, AR | Pass | State |
| 2026-05-20 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-20 | LA CO. SANITATION DIST | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-20 | KINDER MORGAN LIQUIDS TERMINALS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-05-20 | NEXTERA ENERGY | ORLANDO, Orange, FL | Pass | State |
| 2026-05-20 | GENERAL ASPHALT OF LAKELAND, LLC | LAKELAND, Polk, FL | Pass | State |
| 2026-05-20 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-20 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-20 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-20 | GERDAU AMERISTEEL US INC. | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-20 | KM PHOENIX HOLDINGS-DORAVILLE TERMINAL | DORAVILLE, DeKalb, GA | Pass | State |
| 2026-05-20 | SEWELL CREEK ENERGY FACILITY | CEDARTOWN, Polk, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | AURUBIS RICHMOND LLC | AUGUSTA, Richmond, GA | Pass | State |
| 2026-05-20 | HECO - KAHE | KAPOLEI, Honolulu, HI | Pass | State |
| 2026-05-20 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-05-20 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-05-20 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Fail | State |
| 2026-05-20 | INTEGRATED DNA TECHNOLOGIES | CORALVILLE, Johnson, IA | Pass | State |
| 2026-05-20 | INTEGRATED DNA TECHNOLOGIES | CORALVILLE, Johnson, IA | Pass | State |
| 2026-05-20 | DF-AP#1, LLC - BIG SKY WEST DAIRY | GOODING, Gooding, ID | Pending | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | RIVERSTONE GROUP INC | HILLSDALE, Rock Island, IL | Pass | State |
| 2026-05-20 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-05-20 | WARRICK NEWCO LLC — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-05-20 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-05-20 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-05-20 | FORD MOTOR COMPANY - FLAT ROCK ASSEMBLY | FLAT ROCK, Wayne, MI | Pass | State |
| 2026-05-20 | CHIPPEWA VALLEY ETHANOL COMPANY | BENSON, Swift, MN | N/A | State |
| 2026-05-20 | RJ ZAVORAL AND SONS INC NONMETALLIC PORTABLE CRUSHING PLANTS 1 AND 2 | GENTILLY, Polk, MN | Pass | State |
| 2026-05-20 | CAPITAL MATERIALS | OZARK, Christian, MO | Pass | State |
| 2026-05-20 | CAPITAL MATERIALS | OZARK, Christian, MO | Pass | State |
| 2026-05-20 | CAPITAL MATERIALS | OZARK, Christian, MO | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.