EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,633Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,448
- Ohio 2,217
- New Mexico 1,801
- Indiana 1,621
- Florida 1,425
- Wyoming 1,362
- Georgia 1,234
- Oklahoma 1,229
- Pennsylvania 957
- Missouri 772
- Alabama 693
- Mississippi 689
- Arkansas 619
- Iowa 500
- Colorado 405
- Kansas 404
- Michigan 387
- Texas 308
- North Carolina 276
- Illinois 264
- Washington 263
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 207
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 157
- North Dakota 152
- Nebraska 145
- Maine 131
- Louisiana 129
- New York 126
- Arizona 116
- Idaho 111
- Nevada 75
- New Hampshire 59
- Massachusetts 59
- Hawaii 58
- Oregon 56
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- New Jersey 11
- Vermont 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-11-19 | FLORIDA POWER & LIGHT COMPANY | PACE, Santa Rosa, FL | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | PRATT PAPER (GA), LLC — high-priority violation on file | CONYERS, Rockdale, GA | Pass | State |
| 2025-11-19 | HELCO - KEAHOLE — high-priority violation on file | KAILUA KONA, Hawaii, HI | Pass | State |
| 2025-11-19 | CARGILL INC-EDDYVILLE | EDDYVILLE, Monroe, IA | Pass | State |
| 2025-11-19 | VALERO RENEWABLE FUELS CO LLC-FT DODGE | FORT DODGE, Webster, IA | Pass | State |
| 2025-11-19 | NORTHWEST PIPELINE LLC SODA SPRINGS | GEORGETOWN, Bear Lake, ID | Fail | State |
| 2025-11-19 | BLUE MOUND COMPRESSOR STATION | BLUE MOUND, Christian, IL | Pass | State |
| 2025-11-19 | SOUTHERN ILLINOIS POWER COOP | MARION, Williamson, IL | Pass | State |
| 2025-11-19 | METAL SOURCE LLC — high-priority violation on file | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-11-19 | METAL SOURCE LLC — high-priority violation on file | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-11-19 | METAL SOURCE LLC — high-priority violation on file | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-11-19 | SCEPTER INCORPORATED | BICKNELL, Knox, IN | Pass | State |
| 2025-11-19 | SCEPTER INCORPORATED | BICKNELL, Knox, IN | Pass | State |
| 2025-11-19 | CONSTELLATION POWER - PERRYMAN POWER PLANT | ABERDEEN, Harford, MD | Pass | State |
| 2025-11-19 | ND PAPER INC. | RUMFORD, Oxford, ME | Pass | State |
| 2025-11-19 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2025-11-19 | NORTH AMERICAN NATURAL RESOURCES -VENICE PARK 9526 GENERATING STATION | LENNON, Shiawassee, MI | Pass | State |
| 2025-11-19 | CAMBRIA CO | LE SUEUR, Le Sueur, MN | Pass | State |
| 2025-11-19 | GRANITE FALLS ENERGY LLC | GRANITE FALLS, Yellow Medicine, MN | Pass | State |
| 2025-11-19 | AMERESCO JEFFERSON CITY LLC | JEFFERSON CITY, Cole, MO | Pass | State |
| 2025-11-19 | AMERESCO JEFFERSON CITY LLC | JEFFERSON CITY, Cole, MO | Pass | State |
| 2025-11-19 | METROPOLITAN ST. LOUIS SEWER DISTRICT BISSELL POINT WWTP | SAINT LOUIS, St. Louis (city), MO | Pending | State |
| 2025-11-19 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Fail | State |
| 2025-11-19 | PLEASANT HILL COMPRESSOR STATION | PLEASANT HILL, Northampton, NC | Pending | State |
| 2025-11-19 | PATHEON MANUFACTURING SERVICES LLC, PART OF THERMO FISHER SC | GREENVILLE, Pitt, NC | Pending | State |
| 2025-11-19 | E ENERGY ADAMS LLC — high-priority violation on file | ADAMS, Gage, NE | Pass | State |
| 2025-11-19 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-11-19 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-11-19 | QUEEN KEELY CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-19 | QUEEN KEELY CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-19 | PELHAM COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-11-19 | CROWN CORK AND SEAL MESQUITE — high-priority violation on file | MESQUITE, Clark, NV | Pass | Local |
| 2025-11-19 | JOSH PACKAGING INC | HAUPPAUGE, Suffolk, NY | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | HILCORP ENERGY - FAIRFIELD-UNKEFER PRODUCTION FACILITY | COLUMBIANA, Columbiana, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | BLUE RACER MIDSTREAM LLC - BELMONT CO FIELD STATION #1 | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - ALBERT KKW BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - ALBERT KKW BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - ALBERT KKW BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - MALDON WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - MALDON WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES - UTICA LLC - MALDON WRN BL | BARNESVILLE, Belmont, OH | Pass | State |
| 2025-11-19 | EQM OLYMPUS MIDSTREAM, LLC - CATAPULT CS | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-11-19 | EQM OLYMPUS MIDSTREAM, LLC - CATAPULT CS | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-11-19 | EQM OLYMPUS MIDSTREAM, LLC - CATAPULT CS | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES-UTICA, LLC - BROWN WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES-UTICA, LLC - BROWN WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-11-19 | ASCENT RESOURCES-UTICA, LLC - BROWN WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-11-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-11-19 | BUCK CO LLC/QUARRYVILLE — high-priority violation on file | QUARRYVILLE, Lancaster, PA | Pass | State |
| 2025-11-19 | YORK GROUP INC/BLACK BRIDGE RD | YORK, York, PA | Pass | State |
| 2025-11-19 | SUNOCO MIDSTREAM LLC/DUPONT TERMINAL | PITTSTON, Luzerne, PA | Pass | State |
| 2025-11-19 | MCC INTL/MILLER CENT CAST INC/MCDONALD PLT — high-priority violation on file | MC DONALD, Washington, PA | Pass | State |
| 2025-11-19 | EASTERN GAS TRANS & STORAGE INC/CENTRE COMP STA | PLEASANT GAP, Centre, PA | Pass | State |
| 2025-11-19 | EXPAND OPERATING LLC/MASSO SUS PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-11-19 | EXPAND OPERATING LLC/RU-09 HUMBERT III PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-11-19 | EXPAND OPERATING LLC/RU-20 ROMAN PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-11-19 | GERDAU AMERISTEEL US INC | JACKSON, Madison, TN | Incomplete | State |
| 2025-11-19 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-11-19 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-11-19 | US ENERGY DEPT - HANFORD — high-priority violation on file | RICHLAND, Benton, WA | Pending | State |
| 2025-11-19 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-19 | MOLSON COORS USA LLC | MILWAUKEE, Monroe, WI | Pass | State |
| 2025-11-19 | KENTUCKY POWER COMPANY, MITCHELL PLANT | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2025-11-19 | ANTERO MIDSTREAM LLC, MOUNTAIN STATION | PENNSBORO, Tyler, WV | Pass | State |
| 2025-11-19 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-19 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-19 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-11-18 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-11-18 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-11-18 | HILCORP ALASKA, LLC / BEAVER CREEK PRODUCTION FACILITY | KENAI, Kenai Peninsula, AK | Pass | State |
| 2025-11-18 | SOUTHERN NATURAL GAS | ANNISTON, Calhoun, AL | Pass | State |
| 2025-11-18 | CEMEX SOUTHEAST LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-11-18 | CEMEX SOUTHEAST LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-11-18 | CEMEX SOUTHEAST LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-11-18 | DESOTO GATHERING COMPANY, LLC.-STONEFLY CPF 1 | SIDON, Cleburne, AR | Pass | State |
| 2025-11-18 | FLYWHEEL ENERGY COMPANY - PUMA NORTH CPF-1 | WILBURN, Cleburne, AR | Pass | State |
| 2025-11-18 | USMC - YERMO LOGISTICS CNTR | BARSTOW, San Bernardino, CA | Pass | Local |
| 2025-11-18 | ULTRAMAR INC | WILMINGTON, Los Angeles, CA | Fail | Local |
| 2025-11-18 | ELK HILLS POWER LLC | TUPMAN, Kern, CA | Pass | Local |
| 2025-11-18 | ELK HILLS POWER LLC | TUPMAN, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.