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 |
|---|---|---|---|---|
| 2026-06-30 | LENZING FIBERS INC | AXIS, Mobile, AL | Pass | State |
| 2026-06-30 | LENZING FIBERS INC | AXIS, Mobile, AL | Pass | State |
| 2026-06-30 | AMERICAN KRAFT PAPER INDUSTRIES, LLC. | WHITE HALL, Jefferson, AR | Pass | State |
| 2026-06-30 | ENABLE GAS TRANSMISSION, LLC - SEARCY COMPRESSOR STATION | LETONA, White, AR | Pass | State |
| 2026-06-30 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | FOOTHILL SANITARY LANDFILL — high-priority violation on file | LINDEN, San Joaquin, CA | Pass | Local |
| 2026-06-30 | KODAK ALARIS - KODAK MOMENTS COLORADO — high-priority violation on file | WINDSOR AREA, Weld, CO | Pass | State |
| 2026-06-30 | BRIDGEPORT ENERGY LLC | BRIDGEPORT, Fairfield, CT | Pass | State |
| 2026-06-30 | THE MATTABASSETT DISTRICT — high-priority violation on file | CROMWELL, Middlesex, CT | Pass | State |
| 2026-06-30 | PALL CORPORATION | PUTNAM, Windham, CT | Pass | State |
| 2026-06-30 | TEVA PHARMACEUTICALS | DAVIE, Broward, FL | Pass | State |
| 2026-06-30 | TEVA PHARMACEUTICALS | DAVIE, Broward, FL | Pass | State |
| 2026-06-30 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-06-30 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RANTOUL ELECTRIC GENERATING PLANT | RANTOUL, Champaign, IL | Pass | State |
| 2026-06-30 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | SOUTH BEND, St. Joseph, IN | Pass | State |
| 2026-06-30 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | SOUTH BEND, St. Joseph, IN | Pass | State |
| 2026-06-30 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | SOUTH BEND, St. Joseph, IN | Pass | State |
| 2026-06-30 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | SOUTH BEND, St. Joseph, IN | Pass | State |
| 2026-06-30 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-30 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-30 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-30 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-30 | I.I. STANLEY COMPANY, INC. | BATTLE CREEK, Calhoun, MI | Pass | State |
| 2026-06-30 | TOYOTA MOTOR NORTH AMERICA R&D | ANN ARBOR, Washtenaw, MI | Pass | State |
| 2026-06-30 | BRENT RUN LANDFILL | MONTROSE, Genesee, MI | Pass | State |
| 2026-06-30 | GLAXO SMITHKLINE/UPPER PROVIDENCE — high-priority violation on file | COLLEGEVILLE, Montgomery, PA | Pass | State |
| 2026-06-30 | WILLIAMS FIELD SVC CO LLC/WILCOX COMP STA | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2026-06-30 | PINE RUN MIDSTREAM LLC/BASS COMP STA | SAXONBURG, Butler, PA | Pass | State |
| 2026-06-30 | WILLIAMS FIELD SVC CO LLC/WHITE COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-06-30 | EQT ARO LLC/BIEBER SISTERS COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-06-30 | BUCKEYE TERMINALS LLC - NORTH AUGUSTA TERMINAL | N AUGUSTA, Edgefield, SC | Pass | State |
| 2026-06-30 | CANFOR SOUTHERN PINE - CONWAY MILL | CONWAY, Horry, SC | Pending | State |
| 2026-06-30 | EASLEY COMBINED UTILITIES | EASLEY, Pickens, SC | Pending | State |
| 2026-06-30 | TRANSCONTINENTAL GAS PIPELINE COMPANY, LLC | MOORE, Spartanburg, SC | Pass | State |
| 2026-06-30 | SOUTH SUGARLOAF CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-06-30 | SOUTH SUGARLOAF CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-06-30 | SOUTH SUGARLOAF CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-06-30 | SOUTH SUGARLOAF CENTRAL FACILITY | KENEDY, Karnes, TX | Pass | State |
| 2026-06-30 | VALERO THREE RIVERS REFINERY — high-priority violation on file | THREE RIVERS, Live Oak, TX | Pass | State |
| 2026-06-30 | VALERO THREE RIVERS REFINERY — high-priority violation on file | THREE RIVERS, Live Oak, TX | Pass | State |
| 2026-06-30 | VALERO THREE RIVERS REFINERY — high-priority violation on file | THREE RIVERS, Live Oak, TX | Pass | State |
| 2026-06-30 | VALERO THREE RIVERS REFINERY — high-priority violation on file | THREE RIVERS, Live Oak, TX | Pass | State |
| 2026-06-30 | VALERO THREE RIVERS REFINERY — high-priority violation on file | THREE RIVERS, Live Oak, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | OXYCHEM INGLESIDE PLANT | GREGORY, San Patricio, TX | Pass | State |
| 2026-06-30 | SOLSTICE ADVANCED MATERIALS US INC - SOUTH CHESTERFIELD | COLONIAL HEIGHTS, Chesterfield, VA | Pending | State |
| 2026-06-30 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2026-06-30 | VORTEQ COIL FINISHERS — high-priority violation on file | OCONOMOWOC, Waupaca, WI | Pass | State |
| 2026-06-30 | GOFF CONNECTOR LLC, CONNECTOR STATION | BRIDGEPORT, Harrison, WV | Pass | State |
| 2026-06-30 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2026-06-30 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-06-30 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-06-30 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-06-29 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | N/A | State |
| 2026-06-29 | SOUTH HADLEY HIGH SCHOOL | SOUTH HADLEY, Hampshire, MA | Pending | State |
| 2026-06-29 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-06-29 | XCEL ENERGY - SHERBURNE COUNTY GENERATING PLANT | BECKER, Sherburne, MN | Pass | State |
| 2026-06-29 | MARTIN MARIETTA MATERIALS, INC. - HICKORY QUARRY | HICKORY, Catawba, NC | Pass | State |
| 2026-06-29 | APPALACHIA MIDSTREAM SVC LLC/RATTLESNAKE HILL COMP STA | AUBURN TOWNSHIP, Susquehanna, PA | Pass | State |
| 2026-06-29 | COMBINED METAL IND NEW CASTLE FAC — high-priority violation on file | NEW CASTLE, Lawrence, PA | Pass | State |
| 2026-06-29 | EQT ARO LLC/SALT RUN A COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-06-29 | EQT ARO LLC/SALT RUN A COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-06-29 | ROANOKE CEMENT COMPANY | TROUTVILLE, Botetourt, VA | Pass | State |
| 2026-06-29 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2026-06-28 | GE AEROSPACE EVENDALE PLANT | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-06-28 | GE AEROSPACE EVENDALE PLANT | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-06-28 | GE AEROSPACE EVENDALE PLANT | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-06-28 | GE AEROSPACE EVENDALE PLANT | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-06-27 | LINHART CENTRAL FACILITY | KARNES CITY, Karnes, TX | N/A | State |
| 2026-06-26 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Fail | State |
| 2026-06-26 | ANSCHUTZ - WILEY 23-3-97-1 | MEEKER 20.1 MI. NW OF, Rio Blanco, CO | Pass | State |
| 2026-06-26 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-06-26 | RAYONIER PERFORMANCE FIBERS, LLC | JESUP, Wayne, GA | Pass | State |
| 2026-06-26 | BRETT PRICE EXCAVATING INC 00719 | RIGBY, Jefferson, ID | Pending | State |
| 2026-06-26 | MIDWEST AEROSPACE LLC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-26 | MIDWEST AEROSPACE LLC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-26 | MIDWEST AEROSPACE LLC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-26 | MIDWEST AEROSPACE LLC — high-priority violation on file | MERRILLVILLE, Lake, IN | Pass | State |
| 2026-06-26 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-26 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-26 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-26 | LYONDELLBASELL ADVANCED POLYMERS INCORPORATED — high-priority violation on file | EVANSVILLE, Vanderburgh, IN | Pass | State |
| 2026-06-26 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-06-26 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.