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 |
|---|---|---|---|---|
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | MCCALL FARMS INC — high-priority violation on file | EFFINGHAM, Florence, SC | Pass | State |
| 2025-12-15 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-12-15 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-12-15 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-12-15 | WISCONSIN ALUMINUM FOUNDRY — high-priority violation on file | MANITOWOC, Manitowoc, WI | Fail | State |
| 2025-12-15 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-15 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-15 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-13 | HILCORP ALASKA, LLC / PRUDHOE SEAWATER TREATMENT PLANT | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-12-13 | HILCORP ALASKA, LLC / PRUDHOE SEAWATER TREATMENT PLANT | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-12-13 | HILCORP ALASKA, LLC / PRUDHOE SEAWATER TREATMENT PLANT | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-12-13 | HILCORP ALASKA, LLC / PRUDHOE SEAWATER TREATMENT PLANT | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-12-13 | ADVANSIX RESINS AND CHEMICALS LLC - HOPEWELL PLANT — high-priority violation on file | HOPEWELL, Hopewell (city), VA | Pass | State |
| 2025-12-12 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2025-12-12 | ATLAS ASPHALT INC. - MTN HOME PLANT | MOUNTAIN HOME, Baxter, AR | Pass | State |
| 2025-12-12 | ATLAS ASPHALT INC. - MTN HOME PLANT | MOUNTAIN HOME, Baxter, AR | Pass | State |
| 2025-12-12 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-12 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-12-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-12-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-12-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-12-12 | ARCOSA LWB LLC - LIGHTWEIGHT - BOULDER — high-priority violation on file | SUPERIOR AREA, Jefferson, CO | Pass | State |
| 2025-12-12 | ST. JOSEPH'S HOSPITAL | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-12 | ST. JOSEPH'S HOSPITAL | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-12 | ST. JOSEPH'S HOSPITAL | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-12 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-12-12 | VALERO RENEWABLE FUELS COMPANY. LLC D/B/A VALERO LAKOTA PLANT — high-priority violation on file | LAKOTA, Kossuth, IA | Pass | State |
| 2025-12-12 | DANISCO US, INC. — high-priority violation on file | CEDAR RAPIDS, Linn, IA | Fail | Local |
| 2025-12-12 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2025-12-12 | INDIANA MUNICIPAL POWER AGENCY-WHITEWATER VALLEY GENERATING | RICHMOND, Wayne, IN | Pass | State |
| 2025-12-12 | SAPPI NORTH AMERICA, INC. | SKOWHEGAN, Somerset, ME | Pass | State |
| 2025-12-12 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2025-12-12 | FCA US LLC - CHRYSLER TECHNOLOGY CENTER | AUBURN HILLS, Oakland, MI | Pass | State |
| 2025-12-12 | AL-CORN CLEAN FUEL LLC | CLAREMONT, Dodge, MN | Pass | State |
| 2025-12-12 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-12-12 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-12-12 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-12-12 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-12-12 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-12-12 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-12-12 | BASF AGRICULTURAL SOLUTIONS US LLC | PALMYRA, Marion, MO | Pass | State |
| 2025-12-12 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-12 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-12 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-12 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-12 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-12 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-12 | FLATHEAD ELECTRIC LFGE FACILITY | KALISPELL, Flathead, MT | Pass | State |
| 2025-12-12 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-12 | WESTERN SUGAR COOPERATIVE — high-priority violation on file | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-12 | SNEAKY SNAKE 24 CTB 1 | MALAGA, Lea, NM | Pass | State |
| 2025-12-12 | KRAKEN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-12-12 | WILE E COYOTE LGL STATION | EUNICE, Lea, NM | Pass | State |
| 2025-12-12 | WILE E COYOTE LGL STATION | EUNICE, Lea, NM | Pass | State |
| 2025-12-12 | WILE E COYOTE LGL STATION | EUNICE, Lea, NM | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - LEE CLR BL WELLPAD | BRIDGEPORT, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - BAKOS CLR BI | COLERAIN, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | ASCENT RESOURCES - UTICA LLC - PHILLIPS MTP JF | ADENA, Jefferson, OH | Pass | State |
| 2025-12-12 | LUXFER MAGTECH SAXONBURG PLT | SAXONBURG, Butler, PA | Pass | State |
| 2025-12-12 | BLUESTONE PIPELINE CO/COMFORT LAKE COMP STA | HARMONY TWP, Susquehanna, PA | Pass | State |
| 2025-12-12 | DIGITAL WESTERN LANDS LLC | STERLING, Loudoun, VA | Pass | State |
| 2025-12-11 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-12-11 | TARGA- CLARK'S CREEK COMPRESSOR STATION | KEENE, McKenzie, ND | Pass | U.S. EPA |
| 2025-12-11 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-12-11 | TAT-BLUE BUTTES COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-12-11 | WELLBORN CABINETS INC | ASHLAND, Clay, AL | Pass | State |
| 2025-12-11 | ESSITY PROFESSIONAL HYGIENE NA LLC | CHEROKEE, Colbert, AL | Pass | State |
| 2025-12-11 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-12-11 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-12-11 | NATIONAL CEMENT CO OF ALABAMA — high-priority violation on file | RAGLAND, St. Clair, AL | Fail | State |
| 2025-12-11 | NATIONAL CEMENT CO OF ALABAMA — high-priority violation on file | RAGLAND, St. Clair, AL | Fail | State |
| 2025-12-11 | HUNT REFINING COMPANY | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-12-11 | ACME BRICK COMPANY - PERLA PLANT | MALVERN, Hot Spring, AR | Pass | State |
| 2025-12-11 | OWENS CORNING COMPOSITE MATERIALS II, LLC. | FORT SMITH, Sebastian, AR | Pass | State |
| 2025-12-11 | OWENS CORNING COMPOSITE MATERIALS II, LLC. | FORT SMITH, Sebastian, AR | Pass | State |
| 2025-12-11 | OWENS CORNING COMPOSITE MATERIALS II, LLC. | FORT SMITH, Sebastian, AR | Pass | State |
| 2025-12-11 | DESOTO GATHEIRNG COMPANY, LLC - GRAVEL HILL CPF-2 | CLEVELAND (HISTORICAL), TOWNSHIP OF, Van Buren, AR | Pass | State |
| 2025-12-11 | DESOTO GATHERING COMPANY, LLC - GRAVEL HILL CPF-4 | SCOTLAND, Van Buren, AR | Pass | State |
| 2025-12-11 | SACRAMENTO MUNICIPAL UTILITY DIST. FINANCING AUTHORITY DBA MCCLELLAN POWER PLANT | MCCLELLAN, Sacramento, CA | Pending | Local |
| 2025-12-11 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-11 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, 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.