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.