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 |
|---|---|---|---|---|
| 2026-02-10 | SOUTHERN NATURAL GAS COMPANY, L.L.C. - ALBANY COMP. STATION | ALBANY, Dougherty, GA | Pass | State |
| 2026-02-10 | ROBINS AIR FORCE BASE | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-02-10 | ROBINS AIR FORCE BASE | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-02-10 | LOPAREX INC | IOWA CITY, Johnson, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | USDA-NATIONAL ANIMAL DISEASE CENTER & NATIONAL VETERINARY SERVICE LABORATORY | AMES, Story, IA | Pass | State |
| 2026-02-10 | IPL/ALLIANT ENERGY-OTTUMWA GEN STATION | OTTUMWA, Wapello, IA | Pass | State |
| 2026-02-10 | NATURAL GAS PIPELINE CO OF AMERICA-#205 | KEOTA, Washington, IA | Pass | State |
| 2026-02-10 | SOUTHERN ILLINOIS POWER COOP | MARION, Williamson, IL | Pass | State |
| 2026-02-10 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | OWENSVILLE, Gibson, IN | Pass | State |
| 2026-02-10 | IROQUOIS BIO ENERGY COMPANY LLC — high-priority violation on file | RENSSELAER, Jasper, IN | Fail | State |
| 2026-02-10 | IROQUOIS BIO ENERGY COMPANY LLC — high-priority violation on file | RENSSELAER, Jasper, IN | Fail | State |
| 2026-02-10 | IROQUOIS BIO ENERGY COMPANY LLC — high-priority violation on file | RENSSELAER, Jasper, IN | Pass | State |
| 2026-02-10 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-10 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-10 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-02-10 | MIDWESTERN PET FOODS | EVANSVILLE, Vanderburgh, IN | Fail | State |
| 2026-02-10 | BIRLA CARBON USA (AIR) | ULYSSES, Grant, KS | Pass | State |
| 2026-02-10 | NUCOR STEEL GALLATIN LLC | GHENT, Gallatin, KY | Pass | State |
| 2026-02-10 | TENNESSEE VALLEY AUTHORITY (TVA) - SHAWNEE FOSSIL PLANT | WEST PADUCAH, McCracken, KY | Pass | State |
| 2026-02-10 | KINETICA PARTNERS LLC - SEPARATION & DEHYDRATION STATION 523 | COCODRIE, Terrebonne, LA | Pass | State |
| 2026-02-10 | MARBLEHEAD MUNICIPAL-WILKENS | MARBLEHEAD, TOWN OF, Essex, MA | Pending | State |
| 2026-02-10 | ZOETIS LLC | KALAMAZOO, Kalamazoo, MI | Pass | State |
| 2026-02-10 | ANR PIPELINE CO. - GOODWELL COMPRESSOR STATION | WHITE CLOUD, Newaygo, MI | Pass | State |
| 2026-02-10 | ENERGY DEVELOPMENTS PINCONNING, LLC | PINCONNING, Bay, MI | Pass | State |
| 2026-02-10 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2026-02-10 | MAYO MEDICAL CENTER - ROCHESTER | ROCHESTER, Olmsted, MN | Pass | State |
| 2026-02-10 | XCEL ENERGY - HIGH BRIDGE GENERATING STATION | SAINT PAUL, Ramsey, MN | Pass | State |
| 2026-02-10 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, MOSELLE GENERATING PLANT | MOSELLE, Jones, MS | Pass | State |
| 2026-02-10 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, MOSELLE GENERATING PLANT | MOSELLE, Jones, MS | Pass | State |
| 2026-02-10 | TELLUS OPERATING GROUP LLC, RALEIGH CO2 PLANT | RALEIGH, Smith, MS | Pass | State |
| 2026-02-10 | TOYOTA BATTERY MFG. INC. DBA TOYOTA BATTERY MANUFACTURING NC | LIBERTY, Randolph, NC | Pass | State |
| 2026-02-10 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-02-10 | GSP NEWINGTON LLC | NEWINGTON, Rockingham, NH | Pass | State |
| 2026-02-10 | TIGER 14 FACILITY — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-02-10 | EAGLE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-10 | ASTEROID 20-29 FED BATTERY | WHITES CITY, Eddy, NM | Pass | State |
| 2026-02-10 | PHEASANT LGL STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-10 | PHEASANT LGL STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-10 | SPARTAN COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-02-10 | SPARTAN COMPRESSOR STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-02-10 | JAL NO3 GAS PLANT | JAL, Lea, NM | Pass | State |
| 2026-02-10 | 3 BEAR LIBBY GAS PLANT | MONUMENT, Lea, NM | Pass | State |
| 2026-02-10 | SIEGE COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-02-10 | TELESCOPE CASUAL FURNITURE | GRANVILLE, Washington, NY | Pass | State |
| 2026-02-10 | SUNY AT BINGHAMTON | BINGHAMTON, Broome, NY | Pass | State |
| 2026-02-10 | TENNESSEE GAS PIPELINE CO - COMP STA 241 | LAFAYETTE, Onondaga, NY | Pass | State |
| 2026-02-10 | EAST OHIO GAS - COLUMBIANA COMPRESSOR STATION | KNOX, TOWNSHIP OF, Columbiana, OH | Pass | State |
| 2026-02-10 | EAST OHIO GAS - COLUMBIANA COMPRESSOR STATION | KNOX, TOWNSHIP OF, Columbiana, OH | Pass | State |
| 2026-02-10 | EAST OHIO GAS - COLUMBIANA COMPRESSOR STATION | KNOX, TOWNSHIP OF, Columbiana, OH | Pass | State |
| 2026-02-10 | EAST OHIO GAS - COLUMBIANA COMPRESSOR STATION | KNOX, TOWNSHIP OF, Columbiana, OH | Pass | State |
| 2026-02-10 | EAST OHIO GAS - COLUMBIANA COMPRESSOR STATION | KNOX, TOWNSHIP OF, Columbiana, OH | Pass | State |
| 2026-02-10 | EAST OHIO GAS - COLUMBIANA COMPRESSOR STATION | KNOX, TOWNSHIP OF, Columbiana, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | INR MIDSTREAM, LLC - MADISON COMPRESSOR STATION | WOODSFIELD, Monroe, OH | Pass | State |
| 2026-02-10 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-02-10 | CLEVELAND-CLIFFS STEEL CORPORATION — high-priority violation on file | MIDDLETOWN, Butler, OH | Pass | State |
| 2026-02-10 | K PETROLEUM INC/HACKETT COMP STA — high-priority violation on file | BENTLEYVILLE, Washington, PA | Pass | State |
| 2026-02-10 | REPSOL OIL & GAS USA LLC/THOMAS COMP STA | TROY, Bradford, PA | Pass | State |
| 2026-02-10 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/MCMICHAEL COMP STA | CLINTON, Beaver, PA | Pass | State |
| 2026-02-10 | TRANSCONTINENTAL GAS PIPELINE CO LLC/ COMP STA 620 | HEGINS TOWNSHIP, Schuylkill, PA | Pass | State |
| 2026-02-10 | AXALTA COATING SYSTEMS | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-02-10 | HONEYWELL SAFETY PRODUCTS — high-priority violation on file | CLOVER, York, SC | Pending | State |
| 2026-02-10 | HIGH PLAINS PROCESSING, LLC, A DELAWARE LIMITED LIABILITY | MITCHELL, Davison, SD | Pass | State |
| 2026-02-10 | CEMEX CONSTRUCTION MATERIALS ATLANTIC, LLC - KNOXVILLE CEMENT PLANT | KNOXVILLE, Knox, TN | Pass | Local |
| 2026-02-10 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-10 | TRANS-JORDAN CITIES LANDFILL | SOUTH JORDAN, Salt Lake, UT | Pass | State |
| 2026-02-10 | CABINETWORKS GROUP MICHIGAN, LLC - MOUNT JACKSON | MOUNT JACKSON, Shenandoah, VA | Pass | State |
| 2026-02-10 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-02-10 | DYNO BATTERY INC. | SEATTLE, King, WA | Pass | Local |
| 2026-02-10 | DYNO BATTERY INC. | SEATTLE, King, WA | Pass | Local |
| 2026-02-10 | NORTHERN STATES PWR CO WHEATON GEN STA | EAU CLAIRE, Chippewa, WI | Fail | State |
| 2026-02-10 | UNITED WISCONSIN GRAIN PRODUCERS, LLC — high-priority violation on file | FRIESLAND, Columbia, WI | Pass | State |
| 2026-02-10 | WI DOA / UW-MADISON WALNUT ST PLT | MADISON, Dane, WI | Pass | State |
| 2026-02-10 | ITU ABSORBTECH | NEENAH, Wood, WI | Pass | State |
| 2026-02-10 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2026-02-10 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-10 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-02-09 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW CPF-4 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-02-09 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW CPF-4 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-02-09 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-02-09 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-02-09 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-02-09 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2026-02-09 | YALE UNIVERSITY WEST CAMPUS | WEST HAVEN, New Haven, CT | Pass | State |
| 2026-02-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-02-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-02-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.