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 |
|---|---|---|---|---|
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Fail | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-22 | MONTPELIER GENERATING STATION LLC — high-priority violation on file | PONETO, Wells, IN | Pass | State |
| 2026-01-22 | MONTPELIER GENERATING STATION LLC — high-priority violation on file | PONETO, Wells, IN | Pass | State |
| 2026-01-22 | GLWA WATER RESOURCE RECOVERY FACILITY | DETROIT, Wayne, MI | Pass | State |
| 2026-01-22 | TYSON FARMS, INC. - MONROE PROCESSING, FEED MILL, & HATCHERY | MONROE, Union, NC | Pass | State |
| 2026-01-22 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-01-22 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-01-22 | GREEN PLAINS CENTRAL CITY LLC — high-priority violation on file | CENTRAL CITY, Merrick, NE | N/A | State |
| 2026-01-22 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | N/A | State |
| 2026-01-22 | SALT DRAW COMPRESSOR STATION — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-01-22 | SALT DRAW COMPRESSOR STATION — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-01-22 | MACY J COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-22 | MACY J COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-22 | TONY LA RUSSA STATE COM FACILITY | LOVING, Eddy, NM | Pass | State |
| 2026-01-22 | TIGER BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-01-22 | TIGER BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-01-22 | TIGER BOOSTER STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-01-22 | ZIA II GAS PLANT | LOCO HILLS, Lea, NM | Pass | State |
| 2026-01-22 | ZIA II GAS PLANT | LOCO HILLS, Lea, NM | Pass | State |
| 2026-01-22 | TITAN TREATER PLANT NO1 | JAL, Lea, NM | Pass | State |
| 2026-01-22 | GAINES BATY TB | LOVINGTON, Lea, NM | Pass | State |
| 2026-01-22 | H W CHAIR, LTD | MILLERSBURG, Holmes, OH | Pass | State |
| 2026-01-22 | H W CHAIR, LTD | MILLERSBURG, Holmes, OH | Pass | State |
| 2026-01-22 | H W CHAIR, LTD | MILLERSBURG, Holmes, OH | Pass | State |
| 2026-01-22 | APPALACHIA MIDSTREAM SVC LLC/STAGECOACH COMP STA | WYALUSING, Bradford, PA | Pass | State |
| 2026-01-22 | GREYLOCK MIDSTREAM LLC/KUHL-SKIB COMP STA | JEFFERSON, Greene, PA | Pass | State |
| 2026-01-22 | ENERGY TRANSF MKT & TERM LP/MARCUS HOOK TERM — high-priority violation on file | MARCUS HOOK, Delaware, PA | Pass | State |
| 2026-01-22 | COTERRA ENERGY INC/MEAD B PAD 1 — high-priority violation on file | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-01-22 | RU-23 MITCHELL WELL PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-01-22 | NEWMAN & CO/PAPER RECYCLER — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-01-22 | COLOSSUS DATA CENTER | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-01-22 | MOUNTAIN CREEK STEAM ELECTRIC STATION | DALLAS, Dallas, TX | Pass | State |
| 2026-01-22 | ASH GROVE CEMENT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-01-22 | OWENS CORNING INSULATING SYSTEMS WAXAHACHIE PLANT | WAXAHACHIE, Ellis, TX | Pass | State |
| 2026-01-22 | MIDLOTHIAN ENERGY FACILITY | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-01-22 | TOLAR BOOSTER STATION | TOLAR, Hood, TX | Pass | State |
| 2026-01-22 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | N/A | State |
| 2026-01-22 | GUARDIAN INDUSTRIES | CORSICANA, Navarro, TX | Pass | State |
| 2026-01-22 | BRIDGEPORT GAS PLANT | BRIDGEPORT, Wise, TX | Pass | State |
| 2026-01-22 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-22 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-22 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-22 | 50 BUTTES PLANT (THUNDER CREEK GAS SERVICES, LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-22 | LUMAN COMPRESSOR STATION (ENTERPRISE JONAH GAS GATHERING CO) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2026-01-21 | CARMEUSE LIME & STONE INC | SAGINAW, Shelby, AL | Pass | State |
| 2026-01-21 | CARMEUSE LIME & STONE INC | SAGINAW, Shelby, AL | Pass | State |
| 2026-01-21 | ENABLE GAS TRANSMISSION, LLC - WALKER COMPRESSOR STATION | CECIL, Franklin, AR | Pass | State |
| 2026-01-21 | BRIDGE ENERGY, LLC | BREA, Orange, CA | Pass | Local |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-21 | ORLANDO PAVING COMPANY | APOPKA, Orange, FL | Pass | State |
| 2026-01-21 | HUBBARD CONT. CO. DBA ORLANDO PAVING CO. — high-priority violation on file | ORLANDO, Orange, FL | Pass | State |
| 2026-01-21 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2026-01-21 | JOHNSON MATTHEY PROCESS TECHNOLOGIES, INC | SAVANNAH, Chatham, GA | Pass | State |
| 2026-01-21 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-21 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-21 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-21 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-21 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-21 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-21 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-21 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-21 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-01-21 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-21 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-01-21 | MONTPELIER GENERATING STATION LLC — high-priority violation on file | PONETO, Wells, IN | Pass | State |
| 2026-01-21 | MONTPELIER GENERATING STATION LLC — high-priority violation on file | PONETO, Wells, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.