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 |
|---|---|---|---|---|
| 2026-04-22 | UNIVERSITY OF OREGON | EUGENE, Lane, OR | Pass | Local |
| 2026-04-22 | EASTERN GAS TRANS & STORAGE INC/HARRISON STA | HARRISON VALLEY, Potter, PA | Pass | State |
| 2026-04-22 | EQM GATHERING OPCO LLC/TWILIGHT COMP STA | DAISYTOWN, Washington, PA | Pass | State |
| 2026-04-22 | HILCORP ENERGY CO/NCD CENTRAL FAC | NEW CASTLE, Lawrence, PA | Pass | State |
| 2026-04-22 | HILCORP ENERGY CO/MAHONING BUCKER PROD FAC — high-priority violation on file | EDINBURG, Lawrence, PA | Pass | State |
| 2026-04-22 | P&G 2 WELL SITE | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2026-04-22 | WARRINER, S PAD 1 — high-priority violation on file | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-22 | GREENWOOD, R. PAD 2 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-04-22 | LOCKHART POWER COMPANY PACOLET | PACOLET, Spartanburg, SC | Pass | State |
| 2026-04-22 | NEW-INDY CATAWBA LLC | CATAWBA, York, SC | Pending | State |
| 2026-04-22 | GERDAU AMERISTEEL US INC | JACKSON, Madison, TN | Pass | State |
| 2026-04-22 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pass | State |
| 2026-04-22 | MOUNTAIN WEST PIPELINE - KASTLER (FORMERLY DOMINION ENERGY) | UTAH, Undetermined, UT | Pass | State |
| 2026-04-22 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | WOODS CROSS, Davis, UT | Pass | State |
| 2026-04-22 | AMAZON DATA SERVICES, INC. IAD-51 IAD-56 IAD-88 IAD-89 | STERLING, Loudoun, VA | Pass | State |
| 2026-04-22 | MICROSOFT CORPORATION â LEESBURG DATA CENTER (IAD01-02-03-04-05) — high-priority violation on file | LEESBURG, Loudoun, VA | Pending | State |
| 2026-04-22 | TRANSCONTINENTAL GAS PIPELINE-STATION 185 | MANASSAS, Prince William, VA | Pass | State |
| 2026-04-22 | HOPEWELL WATER RENEWAL | HOPEWELL, Hopewell (city), VA | Fail | State |
| 2026-04-22 | PLYMOUTH FOAM INCORPORATED — high-priority violation on file | PLYMOUTH, Sheboygan, WI | Pass | State |
| 2026-04-22 | QUAD/GRAPHICS INC | SUSSEX, Waupaca, WI | Pass | State |
| 2026-04-22 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-04-22 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-04-22 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-04-21 | SOUTHERN NATURAL GAS | ELMORE, Elmore, AL | Pass | State |
| 2026-04-21 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-04-21 | CMC STEEL FABRICATORS | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2026-04-21 | SO CAL GAS - NO. NEEDLES | NEEDLES, San Bernardino, CA | Pass | Local |
| 2026-04-21 | CRESTONE PEAK - MUSTANG BOOSTER STATION — high-priority violation on file | AURORA, Adams, CO | Pass | State |
| 2026-04-21 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2026-04-21 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2026-04-21 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-21 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-21 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2026-04-21 | PDC ENERGY, INC - LAWERENCE 33 SEC HZ | EATON AREA, Weld, CO | Pass | State |
| 2026-04-21 | PDC ENERGY, INC - LAWERENCE 33 SEC HZ | EATON AREA, Weld, CO | Pass | State |
| 2026-04-21 | FORT HILL AG GRID, LLC | THOMPSON, Windham, CT | Pass | State |
| 2026-04-21 | DUKE ENERGY FLORIDA, LLC | GAINESVILLE, Alachua, FL | Pass | State |
| 2026-04-21 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-21 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-21 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-21 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-21 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-21 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-21 | CITY OF TAMPA-WASTEWATER DEPT. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-21 | MIDDLESEX ASPHALT LLC | ORLANDO, Orange, FL | Pass | State |
| 2026-04-21 | IRVING CONSUMER PRODUCTS, INC. - MACON | MACON, Bibb, GA | Pass | State |
| 2026-04-21 | IRVING CONSUMER PRODUCTS, INC. - MACON | MACON, Bibb, GA | Pass | State |
| 2026-04-21 | ATLANTA GAS LIGHT COMPANY - RIVERDALE LNG PLANT — high-priority violation on file | RIVERDALE, Clayton, GA | Pass | State |
| 2026-04-21 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-21 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-21 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-21 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-21 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-21 | MAS GEORGIA LFG, LLC (RICHLAND CREEK) | BUFORD, Gwinnett, GA | Pass | State |
| 2026-04-21 | PANORA MUNICIPAL ELECTRIC | PANORA (HISTORICAL), Guthrie, IA | Pass | State |
| 2026-04-21 | PANORA MUNICIPAL ELECTRIC | PANORA (HISTORICAL), Guthrie, IA | Pass | State |
| 2026-04-21 | PANORA MUNICIPAL ELECTRIC | PANORA (HISTORICAL), Guthrie, IA | Pass | State |
| 2026-04-21 | VAN DIEST SUPPLY CO | WEBSTER CITY, Hamilton, IA | Pass | State |
| 2026-04-21 | LURRE CONSTRUCTION INC 00295 | CALDWELL, Canyon, ID | Pass | State |
| 2026-04-21 | NEW FRONTIER MATERIALS | ALTON, Madison, IL | Pending | State |
| 2026-04-21 | NEW FRONTIER MATERIALS | ALTON, Madison, IL | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | THERMA TRU CORPORATION | BUTLER, DeKalb, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | FCA US LLC KOKOMO TRANSMISSION PLANT | KOKOMO, Howard, IN | Pass | State |
| 2026-04-21 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2026-04-21 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2026-04-21 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-21 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-21 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-21 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-21 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2026-04-21 | METZGER CONSTRUCTION COMPANY INCORPORATED | BOONVILLE, Warrick, IN | Pass | State |
| 2026-04-21 | METZGER CONSTRUCTION COMPANY INCORPORATED | BOONVILLE, Warrick, IN | Pass | State |
| 2026-04-21 | METZGER CONSTRUCTION COMPANY INCORPORATED | BOONVILLE, Warrick, IN | Pass | State |
| 2026-04-21 | METZGER CONSTRUCTION COMPANY INCORPORATED | BOONVILLE, Warrick, IN | Pass | State |
| 2026-04-21 | PANHANDLE EASTERN PIPE LINE - GREENSBURG STATION (AIR) | GREENSBURG, Kiowa, KS | Pass | State |
| 2026-04-21 | SHERWIN WILLIAMS AUTO FINISHES | RICHMOND, Madison, KY | Pass | State |
| 2026-04-21 | CARMEUSE LIME INC — high-priority violation on file | BUTLER, Pendleton, KY | Fail | State |
| 2026-04-21 | OWLS HEAD ALLOYS INC | BOWLING GREEN, Warren, KY | Pass | State |
| 2026-04-21 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-21 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-21 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-21 | PEOPLES LFG, LLC | BIRCH RUN, Saginaw, MI | Pass | State |
| 2026-04-21 | XCEL ENERGY - RED WING GENERATING PLANT | RED WING, Goodhue, MN | Pass | State |
| 2026-04-21 | XCEL ENERGY - PRAIRIE ISLAND NUCLEAR PLANT | WELCH, Goodhue, MN | Pass | State |
| 2026-04-21 | VEOLIA WTS SOLUTIONS USA INC | MINNETONKA, Hennepin, MN | Pass | State |
| 2026-04-21 | ADM - MARSHALL | MARSHALL, Lyon, MN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.