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 |
|---|---|---|---|---|
| 2026-07-31 | DESOTO GATHERING COMPANY, LLC.-OLIVER CPF-1 | SEARCY, White, AR | Pass | State |
| 2026-07-31 | BATEMAN BROS CONSTRUCTION 00698 | SHELLEY, Bingham, ID | Pending | State |
| 2026-07-31 | SIGECO - FB CULLEY GENERATING STATION | NEWBURGH, Warrick, IN | Pass | State |
| 2026-07-31 | PLYMOUTH FOAM, LLC | NEWCOMERSTOWN, Tuscarawas, OH | Pass | State |
| 2026-07-31 | AMGEN MANUFACTURING, INC. | JUNCOS, Juncos, PR | Pass | U.S. EPA |
| 2026-07-31 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-07-31 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-07-31 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-07-31 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-07-30 | DESOTO GATHERING COMPANY, LLC - SOUTHEAST RAINBOW CPF-2 | BEE BRANCH, Conway, AR | Pass | State |
| 2026-07-30 | DESOTO GATHERING COMPANY LLC - NEW QUITMAN CPF-4 | QUITMAN, Faulkner, AR | Pending | State |
| 2026-07-30 | HYTONE AG-GRID, LLC | COVENTRY, Tolland, CT | Pass | State |
| 2026-07-30 | FIRST STATE GENERATION, LLC | WILMINGTON, New Castle, DE | Pending | State |
| 2026-07-30 | EIGHT FLAGS ENERGY LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-07-30 | EIGHT FLAGS ENERGY LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-07-30 | EIGHT FLAGS ENERGY LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-07-30 | EIGHT FLAGS ENERGY LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-07-30 | EIGHT FLAGS ENERGY LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-07-30 | EIGHT FLAGS ENERGY LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2026-07-30 | ONSLOW POWER PRODUCERS, LLC | JACKSONVILLE, Onslow, NC | Pending | State |
| 2026-07-30 | JASPER WOOD PRODUCTS | JASPER, Lane, OR | Pending | Local |
| 2026-07-30 | JOHNSON CRUSHERS INTERNATIONAL | EUGENE, Lane, OR | Pending | Local |
| 2026-07-30 | CAROLINA MOUNTAIN LAND SOLUTIONS LLC — high-priority violation on file | WEST UNION, Oconee, SC | Pending | State |
| 2026-07-30 | COMMONWEALTH CHESAPEAKE POWER STATION | NEW CHURCH, Accomack, VA | Pending | State |
| 2026-07-30 | ANTERO MIDSTREAM LLC, JARVISVILLE COMPRESSOR STATION | SALEM, Harrison, WV | Pass | State |
| 2026-07-30 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-30 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-29 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-5 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-07-29 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-2 | PANGBURN, White, AR | Pass | State |
| 2026-07-29 | VALENCIA POWER PLANT | NOGALES, Santa Cruz, AZ | Pass | State |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | AERA ENERGY LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-07-29 | ARBOR HILLS LANDFILL, INC. — high-priority violation on file | NORTHVILLE, Washtenaw, MI | Pass | State |
| 2026-07-29 | TELLUS OPERATING GROUP LLC, RALEIGH CO2 PLANT | RALEIGH, Smith, MS | Pass | State |
| 2026-07-29 | CAROLINAEAST MEDICAL CENTER | NEW BERN, Craven, NC | Pending | State |
| 2026-07-29 | CITY OF GREENSBORO - T.Z. OSBORNE WATER RECLAMATION FACILITY — high-priority violation on file | MCLEANSVILLE, Guilford, NC | Pending | State |
| 2026-07-29 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-07-29 | RICHMOND UNIVERSITY MEDICAL CENTER | STATEN ISLAND, Richmond, NY | Pass | State |
| 2026-07-29 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES - UTICA LLC - BANJO SHC HR | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES - UTICA LLC - BANJO SHC HR | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | ASCENT RESOURCES - UTICA LLC - BANJO SHC HR | CADIZ, Harrison, OH | Pass | State |
| 2026-07-29 | LAUREL MTN MIDSTREAM OPR LLC/SHAMROCK COMP STA — high-priority violation on file | SALEM, Fayette, PA | Pass | State |
| 2026-07-29 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2026-07-29 | C R JACKSON INC COLUMBIA PLANT #410 — high-priority violation on file | COLUMBIA, Richland, SC | Fail | State |
| 2026-07-29 | GRANGES AMERICAS INC. — high-priority violation on file | HUNTINGDON, Carroll, TN | Pending | State |
| 2026-07-29 | BAE SYSTEMS ORDNANCE SYSTEMS INC. — high-priority violation on file | KINGSPORT, Hawkins, TN | Pass | State |
| 2026-07-29 | TENNESSEE GAS PIPELINE COMPANY, LLC | NUNNELLY, Hickman, TN | Pending | State |
| 2026-07-29 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-07-29 | TEXAS INSTRUMENTS RICHARDSON | RICHARDSON, Collin, TX | Pass | State |
| 2026-07-29 | PRAXIS ENNIS FACILITY | ENNIS, Ellis, TX | Pass | State |
| 2026-07-29 | PRAXIS ENNIS FACILITY | ENNIS, Ellis, TX | Pass | State |
| 2026-07-29 | ARCOSA LIGHTWEIGHT STREETMAN | STREETMAN, Navarro, TX | Pass | State |
| 2026-07-29 | WEATHERFORD PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-07-29 | SOUTHLAKE REFINED PRODUCTS TERMINAL | GRAPEVINE, Tarrant, TX | Pass | State |
| 2026-07-29 | B117 LATERAL COMPRESSOR STATION | RHOME, Wise, TX | Pass | State |
| 2026-07-29 | SIERRA PACIFIC INDUSTRIES - COGENERATION — high-priority violation on file | ABERDEEN, Grays Harbor, WA | Pending | Local |
| 2026-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-29 | BOLT 35 COMPRESSOR STATION (EOG RESOURCES, INC.) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-29 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-07-28 | AMERICAN CAST IRON PIPE COMPANY | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-07-28 | DESOTO GATHERING COMPANY, LLC - NE CHARLEY CPF-2 | DRASCO, Cleburne, AR | Pass | State |
| 2026-07-28 | DESOTO GATHERING COMPANY, LLC - NE CHARLEY CPF-2 | DRASCO, Cleburne, AR | Pass | State |
| 2026-07-28 | ENTERGY ARKANSAS, LLC - WHITE BLUFF PLANT | REDFIELD, Jefferson, AR | Pass | State |
| 2026-07-28 | ENABLE GAS TRANSMISSION, LLC - SEARCY COMPRESSOR STATION | LETONA, White, AR | Pass | State |
| 2026-07-28 | AERA ENERGY LLC | VENTURA, Ventura, CA | Pass | Local |
| 2026-07-28 | MOLSON COORS USA LLC - GOLDEN BREWERY — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Pending | State |
| 2026-07-28 | MOLSON COORS USA LLC - GOLDEN BREWERY — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Pending | State |
| 2026-07-28 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-28 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-28 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2026-07-28 | WESTLAKE VINYLS INC | CALVERT CITY, Marshall, KY | Pass | State |
| 2026-07-28 | CITGO/ZENITH PETROLEUM TERMINAL | CURTIS BAY, Baltimore (city), MD | Pass | State |
| 2026-07-28 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2026-07-28 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-07-28 | SUNROCK INDUSTRIES LLC - MUIRHEAD DISTRIBUTION CENTER | DURHAM, Durham, NC | Pending | State |
| 2026-07-28 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2026-07-28 | NEWINGTON ENERGY | NEWINGTON, Rockingham, NH | Pending | State |
| 2026-07-28 | NEWINGTON ENERGY | NEWINGTON, Rockingham, NH | Pending | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - KELPIE WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - KELPIE WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-28 | ASCENT RESOURCES - UTICA LLC - KELPIE WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-07-28 | HERMITAGE MUNI AUTH/HERMITAGE WPCP | HERMITAGE, Mercer, PA | Pass | State |
| 2026-07-28 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2026-07-28 | PANAGAKOS ASPHALT PAVING GRAY COURT | GRAY COURT, Laurens, SC | Pass | State |
| 2026-07-28 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pending | State |
| 2026-07-28 | ENNIS POWER | ENNIS, Ellis, TX | Pass | State |
| 2026-07-28 | GLOBAL FORT WORTH TERMINAL | FORT WORTH, Tarrant, TX | Pass | State |
| 2026-07-28 | CHICO GAS PLANT | CHICO, Wise, TX | Pass | State |
| 2026-07-27 | DESOTO GATHERING COMPANY, LLC - NORTH YELLOWSTONE CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.