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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.