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.
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.