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 |
|---|---|---|---|---|
| 2026-06-02 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2026-06-02 | DUKE ENERGY FLORIDA, LLC | BARTOW, Polk, FL | Pass | State |
| 2026-06-02 | DUKE ENERGY FLORIDA, LLC | BARTOW, Polk, FL | Pass | State |
| 2026-06-02 | SEMINOLE ELECTRIC COOPERATIVE, INC. | PALATKA, Putnam, FL | Pass | State |
| 2026-06-02 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-02 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-02 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-02 | EDWARD L. ADDISON GENERATING PLANT | THOMASTON, Upson, GA | Pass | State |
| 2026-06-02 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-02 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-02 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Fail | State |
| 2026-06-02 | KNIFE RIVER CORP - MTN WEST 00051 | BOISE, Ada, ID | Pass | State |
| 2026-06-02 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-02 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-02 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-02 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-02 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-02 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-02 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-02 | FREUDENBERG NOK GENERAL PARTNERSHIP | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-02 | ARKALON ETHANOL (AIR) | LIBERAL, Seward, KS | Pass | State |
| 2026-06-02 | DTE GAS COMPANY - WILLOW RUN COMPRESSOR STATION | YPSILANTI, Washtenaw, MI | Pass | State |
| 2026-06-02 | XCEL ENERGY - WESCOTT LNG PLANT | INVER GROVE HEIGHTS, Dakota, MN | Pass | State |
| 2026-06-02 | GREAT RIVER ENERGY - LAKEFIELD JUNCTION STATION | TRIMONT, Martin, MN | Pass | State |
| 2026-06-02 | KAAPA PARTNERS AURORA LLC — high-priority violation on file | AURORA, Hamilton, NE | Pass | State |
| 2026-06-02 | REDLAND QUARRIES NY INC-LOCKPORT FACILITY | LOCKPORT(C);LOCKPORT(T), Niagara, NY | Pass | State |
| 2026-06-02 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-06-02 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-06-02 | EOG RESOURCES, INC. - KIDD 21-12-6 PAD | SCIO, Harrison, OH | Pass | State |
| 2026-06-02 | DUANE WEISEND PAD 952440 | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-06-02 | DUANE WEISEND PAD 952440 | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-06-02 | DUANE WEISEND PAD 952440 | SUMMERFIELD, Noble, OH | Pass | State |
| 2026-06-02 | GRAYMONT PA INC/PLEASANT GAP & CON-LIME & BELLEFONTE PLTS | BELLEFONTE, Centre, PA | Pass | State |
| 2026-06-02 | APPALACHIA MIDSTREAM SVC LLC/GRANVILLE STA 2 | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2026-06-02 | BLACKHILL ENERGY LLC/BEARDSLEE COMP STA | TROY, Bradford, PA | Pass | State |
| 2026-06-02 | EQM GATHERING OPCO LLC/PISCES COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2026-06-02 | BROWN UNIVERSITY | PROVIDENCE, Providence, RI | Pass | State |
| 2026-06-02 | AMRIZE CEMENT INC. - HOLLY HILL PLANT | HOLLY HILL, Orangeburg, SC | Pending | State |
| 2026-06-02 | US BRICK LLC | COLUMBIA, Richland, SC | Pending | State |
| 2026-06-02 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2026-06-02 | GREGORY PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-02 | GREGORY PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-02 | PPG INDUSTRIES — high-priority violation on file | OAK CREEK, Monroe, WI | Pass | State |
| 2026-06-02 | ARDAGH GLASS INC — high-priority violation on file | BURLINGTON, Richland, WI | Pass | State |
| 2026-06-02 | DOMTAR AW LLC — high-priority violation on file | NEKOOSA, Menominee, WI | Pass | State |
| 2026-06-02 | EQM GATHERING OPCO, LLC, PANDORA STATION | WEST UNION, Doddridge, WV | Pass | State |
| 2026-06-02 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2026-06-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-02 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-06-02 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-02 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-02 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-02 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-02 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-02 | BRIDGER COMPRESSOR STATION (ENTERPIRSE JONAH GAS GATHERING) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-02 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-01 | FLYWHEEL ENERGY COMPANY - PUMA NORTH CPF-1 | WILBURN, Cleburne, AR | Pass | State |
| 2026-06-01 | FLYWHEEL ENERGY COMPANY - PUMA NORTH CPF-1 | WILBURN, Cleburne, AR | Pass | State |
| 2026-06-01 | DUKE ENERGY FLORIDA, LLC | GAINESVILLE, Alachua, FL | Pass | State |
| 2026-06-01 | PINE TREE ACRES, INC. | LENOX TOWNSHIP, Macomb, MI | Pass | State |
| 2026-06-01 | ROCKY MOUNTAIN LABORATORIES FACILITY | HAMILTON, Ravalli, MT | Pass | State |
| 2026-06-01 | MARTIN MARIETTA MATERIALS, INC. - ASHEBORO QUARRY | ASHEBORO, Randolph, NC | Pass | State |
| 2026-06-01 | DUNBAR COMPRESSOR STATION | WINDSOR, Broome, NY | Pass | State |
| 2026-06-01 | LPR MIDSTREAM PARTNERS LLC/PMG ALLEN STA | ADDISON, Somerset, PA | Pass | State |
| 2026-06-01 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-06-01 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-06-01 | EIGHT MILE LAKE STATION (WILLIAMS FIELD SERVICES COMPANY) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-01 | EIGHT MILE LAKE STATION (WILLIAMS FIELD SERVICES COMPANY) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-01 | EIGHT MILE LAKE STATION (WILLIAMS FIELD SERVICES COMPANY) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-06-01 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-01 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-01 | BIRD CANYON/COUNTY LINE COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-06-01 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-05-29 | DOYON UTILITIES, LLC / DU-JBER-ELECTRIC, GAS, DRINKING WATER A | ANCHORAGE, Anchorage Municipality, AK | Pass | State |
| 2026-05-29 | HILCORP ALASKA, LLC / BEAVER CREEK PRODUCTION FACILITY | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-05-29 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2026-05-29 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-29 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-29 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-29 | INTERNATIONAL PAPER - FLINT RIVER MILL | OGLETHORPE, Macon, GA | Pass | State |
| 2026-05-29 | MID AMERICAN ENERGY CO-COUNCIL BLUFFS | COUNCIL BLUFFS, Pottawattamie, IA | Pass | State |
| 2026-05-29 | REWORLD INDIANAPOLIS INCORPORATED | INDIANAPOLIS, Marion, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.