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 |
|---|---|---|---|---|
| 2026-07-27 | DESOTO GATHERING COMPANY, LLC - SOUTHWEST GREER LAKE CPF-5 | CLINTON, Van Buren, AR | Pass | State |
| 2026-07-27 | ST. MARYS CEMENT | DETROIT, Wayne, MI | Pass | State |
| 2026-07-27 | LANSING BOARD OF WATER & LIGHT - ERICKSON STATION | LANSING, Eaton, MI | Pass | State |
| 2026-07-27 | LANSING BOARD OF WATER & LIGHT - ERICKSON STATION | LANSING, Eaton, MI | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - WATKINS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - WATKINS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - WATKINS CR MON PAD | CARROLLTON, Carroll, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - SPROUL 20-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - SPROUL 20-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-07-27 | EOG RESOURCES, INC. - SPROUL 20-13-7 PAD | UHRICHSVILLE, Tuscarawas, OH | Pass | State |
| 2026-07-27 | ABBOTT, M. PAD 1 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-07-25 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-07-25 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-07-25 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-25 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-25 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-25 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-25 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-25 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-5 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-07-24 | DESOTO GATHERING COMPANY, LLC - CHARLEY CPF-4 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-07-24 | PLATTE RIVER POWER AUTHORITY - RAWHIDE | WELLINGTON 9.3 MI. N OF, Larimer, CO | Pass | State |
| 2026-07-24 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-24 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-24 | GREEN PLAINS MOUNT VERNON LLC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-24 | KENDRICK PLASTICS | GRAND RAPIDS, Kent, MI | Pass | State |
| 2026-07-24 | OPMOBILITY EXTERIOR USA, LLC | GREER, Greenville, SC | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-07-24 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | N/A | State |
| 2026-07-23 | ALLIED ENERGY CORP. | BIRMINGHAM, Jefferson, AL | Pending | Local |
| 2026-07-23 | ENTERGY ARKANSAS, LLC - INDEPENDENCE PLANT | NEWARK, Independence, AR | Pass | State |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-07-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-07-23 | HILMAR CHEESE COMPANY — high-priority violation on file | HILMAR, Merced, CA | Pass | Local |
| 2026-07-23 | AMERICAN GYPSUM COMPANY | GYPSUM, Eagle, CO | Pass | State |
| 2026-07-23 | AMERICAN GYPSUM COMPANY | GYPSUM, Eagle, CO | Pass | State |
| 2026-07-23 | AMERICAN GYPSUM COMPANY | GYPSUM, Eagle, CO | Pass | State |
| 2026-07-23 | PLATTE RIVER POWER AUTHORITY - RAWHIDE | WELLINGTON 9.3 MI. N OF, Larimer, CO | Pass | State |
| 2026-07-23 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pending | State |
| 2026-07-23 | GRAIN PROCESSING CORPORATION — high-priority violation on file | WASHINGTON, Daviess, IN | Fail | State |
| 2026-07-23 | MILESTONE CONTRACTORS LP | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-07-23 | MILESTONE CONTRACTORS LP | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-07-23 | MILESTONE CONTRACTORS LP | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-07-23 | MILESTONE CONTRACTORS LP | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-07-23 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-23 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-23 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-23 | VALERO RENEWABLE FUELS CO LLC DBA VALERO MT VERNON PLANT — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2026-07-23 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2026-07-23 | TEXAS GAS TRANS LLC | HARDINSBURG, Breckinridge, KY | Pass | State |
| 2026-07-23 | MASSPOWER | SPRINGFIELD, CITY OF, Hampden, MA | Pending | State |
| 2026-07-23 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MID STATES MATERIALS LLC | STRAFFORD, Greene, MO | Pass | State |
| 2026-07-23 | MARSH FURNITURE COMPANY — high-priority violation on file | HIGH POINT, Guilford, NC | Pending | State |
| 2026-07-23 | LUCK STONE CORPORATION - MOUNT AIRY PLANT | MOUNT AIRY, Surry, NC | Pending | State |
| 2026-07-23 | JOINTA LIME CO ASPHALT PLANT | NEW WINDSOR, Orange, NY | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - BORUM SMF JF | SMITHFIELD, TOWNSHIP OF, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - BORUM SMF JF | SMITHFIELD, TOWNSHIP OF, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - BORUM SMF JF | SMITHFIELD, TOWNSHIP OF, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - RONALD SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - RONALD SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2026-07-23 | ASCENT RESOURCES - UTICA LLC - RONALD SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2026-07-23 | COLUMBIA GAS TRANS CORP/SALISBURY COMP STA | SALISBURY, Somerset, PA | Pass | State |
| 2026-07-23 | MARKWEST LIBERTY BLUESTONE LLC/TRILLITH COMP STA | HARMONY, Butler, PA | Pass | State |
| 2026-07-23 | HEP PENNSYLVANIA GATHERING LLC/WHITE CPF 1 COMP STA | STEVENSVILLE, Bradford, PA | Pass | State |
| 2026-07-23 | WRIGHT, W. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-23 | VANDERMARK, R. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-07-23 | BUCKEYE TERMINALS LLC - SPARTANBURG TERMINAL | SPARTANBURG, Spartanburg, SC | Pass | State |
| 2026-07-23 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-23 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-23 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-23 | MARY'S DRAW (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-22 | ALLIED ENERGY CORP. | BIRMINGHAM, Jefferson, AL | Pending | Local |
| 2026-07-22 | ENTERGY ARKANSAS, LLC - INDEPENDENCE PLANT | NEWARK, Independence, AR | Pass | State |
| 2026-07-22 | AMERICAN GYPSUM COMPANY | GYPSUM, Eagle, CO | Pass | State |
| 2026-07-22 | AMERICAN GYPSUM COMPANY | GYPSUM, Eagle, CO | Pass | State |
| 2026-07-22 | NYDIG DFM - SURPRISE S4 FACILITY | WALDEN AREA, Jackson, CO | N/A | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.