EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | LORAIN COUNTY RNG FACILITY — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-09 | ASCENT RESOURCES - UTICA LLC - PORTERFIELD WELL PAD | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-10-09 | ASCENT RESOURCES - UTICA LLC - PORTERFIELD WELL PAD | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-10-09 | ASCENT RESOURCES - UTICA LLC - PORTERFIELD WELL PAD | WASHINGTON, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-10-09 | GLAXO SMITHKLINE/UPPER PROVIDENCE — high-priority violation on file | COLLEGEVILLE, Montgomery, PA | Pass | State |
| 2025-10-09 | TENNESSEE GAS PIPELINE CO/315 WELLSBORO | WELLSBORO, Tioga, PA | Pass | State |
| 2025-10-09 | TEXAS EASTERN TRANS LP/TE DELMONT COMP STA | GREENSBURG, Westmoreland, PA | Pass | State |
| 2025-10-09 | DALRYMPLE GRAVEL & CONTR/BRADFORD CNTY PLT | SAYRE, Bradford, PA | Pass | State |
| 2025-10-09 | MAINESBURG GS LP/MAINESBURG GATHERING STA | MANSFIELD, Tioga, PA | Pass | State |
| 2025-10-09 | KING ASPHALT INC SIMPSONVILLE | SIMPSONVILLE, Greenville, SC | Pass | State |
| 2025-10-09 | RECYCLE AEROSOL, LLC | BELLS, Crockett, TN | Pass | State |
| 2025-10-09 | ALLIED METAL CO. | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2025-10-09 | ALLIED METAL CO. | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2025-10-09 | MINASOLVE, LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-10-09 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-09 | QTS INVESTMENT PROPERTIES ASHBURN LLC | STERLING, Loudoun, VA | Pass | State |
| 2025-10-09 | ELROY MUNICIPAL ELECTRIC UTILITY (EMEU) | ELROY, Juneau, WI | Pass | State |
| 2025-10-09 | AMCOR WISCONSIN, LLC - NEW LONDON | NEW LONDON, Ozaukee, WI | Pass | State |
| 2025-10-09 | CHARTER STEEL | SAUKVILLE, Ozaukee, WI | Pass | State |
| 2025-10-09 | WPL - NEENAH GENERATING FACILITY — high-priority violation on file | NEENAH, Winnebago, WI | Pass | State |
| 2025-10-09 | APPALACHIAN POWER CO. - MOUNTAINEER PLANT, NEW HAVEN | NEW HAVEN, Mason, WV | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-09 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-08 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-08 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-08 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-08 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-08 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-10-08 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-08 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-08 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-08 | POTLATCHDELTIC LAND & LUMBER, LLC - WARREN LUMBER MILL | WARREN, Bradley, AR | Pass | State |
| 2025-10-08 | DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-10-08 | DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-10-08 | DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-10-08 | ENTERGY ARKANSAS, LLC - WHITE BLUFF PLANT | REDFIELD, Jefferson, AR | Pass | State |
| 2025-10-08 | FAYETTEVILLE EXPRESS PIPELINE LLC - RUSSELL COMPRESSOR STATION | BALD KNOB, White, AR | Pass | State |
| 2025-10-08 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pending | State |
| 2025-10-08 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2025-10-08 | HANDYTUBE LLC | CAMDEN, Kent, DE | N/A | State |
| 2025-10-08 | HANDYTUBE LLC | CAMDEN, Kent, DE | N/A | State |
| 2025-10-08 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Fail | State |
| 2025-10-08 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-10-08 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-10-08 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-10-08 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-10-08 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-08 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-08 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-08 | ILLINOIS POWER GENERATING CO | NEWTON, Jasper, IL | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | URSCHEL LABORATORIES INC | CHESTERTON, Porter, IN | Pass | State |
| 2025-10-08 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-08 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-08 | LIBERTY LANDFILL LLC | MONTICELLO, White, IN | Pass | State |
| 2025-10-08 | EVERGY - EMPORIA (AIR) | EMPORIA, Lyon, KS | Pass | State |
| 2025-10-08 | EVERGY - EMPORIA (AIR) | EMPORIA, Lyon, KS | Pass | State |
| 2025-10-08 | CORNING INCORPORATED | HARRODSBURG, Mercer, KY | Pass | State |
| 2025-10-08 | SPRAGUE OPERATING RESOURCES LLC | SEARSPORT, Waldo, ME | Pass | State |
| 2025-10-08 | EUROVIA ATLANTIC COAST LLC D/B/A COPIAM ASPHALT SOLUTIONS | HERMON, Penobscot, ME | Pass | State |
| 2025-10-08 | GREDE IRON MOUNTAIN, LLC — high-priority violation on file | KINGSFORD, Dickinson, MI | Pass | State |
| 2025-10-08 | WEYERHAEUSER NR COMPANY | GRAYLING, Crawford, MI | Pass | State |
| 2025-10-08 | MPLX TERMINALS LLC - NORTH MUSKEGON TERMINAL | MUSKEGON, Muskegon, MI | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.