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 |
|---|---|---|---|---|
| 2026-04-24 | MICROSOFT CORPORATION â LEESBURG DATA CENTER (IAD01-02-03-04-05) — high-priority violation on file | LEESBURG, Loudoun, VA | Pending | State |
| 2026-04-24 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-04-24 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-04-24 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-04-24 | BAGGS MAINLINE/BLUE GAP COMPRESSOR STATION (CROWHEART ENERGY, LLC) | CARBON COUNTY, Carbon, WY | Pass | State |
| 2026-04-23 | U S GYPSUM | BRIDGEPORT, Jackson, AL | Pass | State |
| 2026-04-23 | U S GYPSUM | BRIDGEPORT, Jackson, AL | Pass | State |
| 2026-04-23 | ARKEMA INC | AXIS, Mobile, AL | Pass | State |
| 2026-04-23 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-04-23 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2026-04-23 | DRUMMOND COMPANY, INC. (ABC COKE) | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-23 | DRUMMOND COMPANY, INC. (ABC COKE) | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-23 | LARAMIE ENERGY - MVS COMPRESSOR STATION | COLLBRAN 10.8 MI. E OF, Mesa, CO | Pass | State |
| 2026-04-23 | UGC MIDSTREAM - FOUNDATION CREEK CS — high-priority violation on file | RANGELY 27.5 MI. S OF, Rio Blanco, CO | Pass | State |
| 2026-04-23 | DCP OPERATING CO - MEWBOURN — high-priority violation on file | GILCREST 2.4 MI. N OF, Weld, CO | Pass | State |
| 2026-04-23 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-23 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-23 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-23 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-23 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-23 | WHEELABRATOR SOUTH BROWARD, INC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2026-04-23 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-04-23 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-04-23 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-04-23 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-04-23 | INTERNATIONAL PAPER COMPANY | CANTONMENT, Escambia, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2026-04-23 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-23 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-23 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-23 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-23 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-04-23 | RUVEON - SODA SPRINGS PLANT (TV FACILITY) | SODA SPRINGS, Caribou, ID | Pass | State |
| 2026-04-23 | MIDWEST GENERATION LLC | PEKIN, Tazewell, IL | Pass | State |
| 2026-04-23 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-23 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-23 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-23 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-04-23 | PANHANDLE EASTERN PIPE LINE - LIBERAL STATION(AIR) | LIBERAL, Seward, KS | Pass | State |
| 2026-04-23 | CENTURY ALUMINUM SEBREE LLC | ROBARDS, Henderson, KY | Pass | State |
| 2026-04-23 | LOUISVILLE GAS & ELECTRIC CO - TRIMBLE CO GENERATING STATION | BEDFORD, Trimble, KY | Pass | State |
| 2026-04-23 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-23 | KOSMOS CEMENT COMPANY LLC | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-23 | SWIFT PORK COMPANY | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-04-23 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-23 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-04-23 | BILLERUD QUINNESEC LLC | QUINNESEC, Dickinson, MI | Pass | State |
| 2026-04-23 | WASHINGTON 10 STORAGE CORPORATION | WASHINGTON, Macomb, MI | Pass | State |
| 2026-04-23 | CERTAINTEED LLC | JONESBURG, Montgomery, MO | Fail | State |
| 2026-04-23 | METROPOLITAN ST. LOUIS SEWER DISTRICT BISSELL POINT WWTP | SAINT LOUIS, St. Louis (city), MO | Pass | State |
| 2026-04-23 | METROPOLITAN ST. LOUIS SEWER DISTRICT BISSELL POINT WWTP | SAINT LOUIS, St. Louis (city), MO | Pass | State |
| 2026-04-23 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-23 | FLORIDA GAS TRANSMISSION COMPANY LLC, WIGGINS COMPRESSOR STATION NUMBER 10 | WIGGINS, Perry, MS | Pass | State |
| 2026-04-23 | NUCOR STEEL - HERTFORD | COFIELD, Hertford, NC | Pass | State |
| 2026-04-23 | ARDAGH GLASS INC. | HENDERSON, Vance, NC | Pass | State |
| 2026-04-23 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-04-23 | SALT FLATS GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-23 | SALT FLATS GAS SALES COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-04-23 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-23 | BIG LIZARD COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-04-23 | RANGER PEAK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-04-23 | TENNESSEE GAS PIPELINE CO - COMP STA 241 | LAFAYETTE, Onondaga, NY | Pass | State |
| 2026-04-23 | PLASKOLITE, LLC. | COLUMBUS, Franklin, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SEABRIGHT CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SEABRIGHT CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SEABRIGHT CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SMITH CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SMITH CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - SMITH CLR BL | BRIDGEPORT, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-23 | ASCENT RESOURCES - UTICA LLC - OBOY CLR BL WELLPAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | ENERGY TRANSFER -ROVER PIPELINE - CADIZ COMPRESSOR STN | CADIZ, Harrison, OH | Pass | State |
| 2026-04-23 | HAVERHILL COKE COMPANY LLC — high-priority violation on file | FRANKLIN FURNACE, Scioto, OH | Pass | State |
| 2026-04-23 | MAGNESITA REFRACTORIES/YORK — high-priority violation on file | YORK, York, PA | Pass | State |
| 2026-04-23 | EASTERN GAS TRANS & STORAGE INC/STATE LINE STA | GENESEE, Potter, PA | Pass | State |
| 2026-04-23 | ASC ENGINEERED SOLUTIONS LLC/COLUMBIA FKA ANVIL | COLUMBIA, Lancaster, PA | Pass | State |
| 2026-04-23 | NFG MIDSTREAM COVINGTON LLC/SHAW COMP STA | MAINESBURG, Tioga, PA | Pending | State |
| 2026-04-23 | HILCORP ENERGY CO/PULASKI WHITING CTL FAC — high-priority violation on file | EDINBURG, Lawrence, PA | Pass | State |
| 2026-04-23 | RUSSO, B. PAD 1 — high-priority violation on file | SPRINGVILLE, Susquehanna, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.