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 |
|---|---|---|---|---|
| 2026-03-11 | SOUTHERN NATURAL GAS CO. — high-priority violation on file | WRENS, Jefferson, GA | Pass | State |
| 2026-03-11 | IOWA FERTILIZER CO — high-priority violation on file | WEVER, Lee, IA | Pass | State |
| 2026-03-11 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-03-11 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2026-03-11 | WATERLOO CITY LIGHT PLANT | WATERLOO, Monroe, IL | Pass | State |
| 2026-03-11 | RAYBESTOS POWERTRAIN LLC — high-priority violation on file | CRAWFORDSVILLE, Montgomery, IN | Pass | State |
| 2026-03-11 | CENTURY ALUMINUM SEBREE LLC | ROBARDS, Henderson, KY | Pass | State |
| 2026-03-11 | TEXAS GAS TRANSMISSION LLC - WEST GREENVILLE TRANSMISSION STATION | GREENVILLE, Muhlenberg, KY | Pass | State |
| 2026-03-11 | WHEELABRATOR MILLBURY INC | MILLBURY, Worcester, MA | Pending | State |
| 2026-03-11 | ENTEGRIS INC — high-priority violation on file | BEDFORD, TOWN OF, Middlesex, MA | Pending | State |
| 2026-03-11 | CURTIS BAY ENERGY, LP — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2026-03-11 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2026-03-11 | ANR PIPELINE - REED CITY COMPRESSOR STATION | REED CITY, Osceola, MI | Pass | State |
| 2026-03-11 | GCF US HOLDINGS, LLC - COLUMBUS MILL — high-priority violation on file | COLUMBUS, Lowndes, MS | Pass | State |
| 2026-03-11 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-03-11 | TOYOTA BATTERY MFG. INC. DBA TOYOTA BATTERY MANUFACTURING NC | LIBERTY, Randolph, NC | Pass | State |
| 2026-03-11 | HEIDELBERG MATERIALS SOUTHEAST AGG LLC - NEVERSON QUARRY | SIMS, Wilson, NC | Pass | State |
| 2026-03-11 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-11 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2026-03-11 | MIMOSA 18 CTB 1 | LA HUERTA, Eddy, NM | Pass | State |
| 2026-03-11 | MIMOSA 18 CTB 1 | LA HUERTA, Eddy, NM | Pass | State |
| 2026-03-11 | RED ROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-03-11 | MESA VERDE WEST CENTRAL GAS LIFT STATION | MALAGA, Lea, NM | Pass | State |
| 2026-03-11 | NORTHEAST SOLITE CORPORATION | MT MARION, Ulster, NY | Pass | State |
| 2026-03-11 | WIN WASTE INNOVATIONS OF SENECA COUNTY | FOSTORIA, Seneca, OH | Pass | State |
| 2026-03-11 | ENBRIDGE- NEW CAMBRIDGE COMPRESSOR STATION | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-11 | ENBRIDGE- NEW CAMBRIDGE COMPRESSOR STATION | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-11 | ENBRIDGE- NEW CAMBRIDGE COMPRESSOR STATION | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-11 | ENBRIDGE- NEW CAMBRIDGE COMPRESSOR STATION | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-11 | ENBRIDGE- NEW CAMBRIDGE COMPRESSOR STATION | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-11 | ENBRIDGE- NEW CAMBRIDGE COMPRESSOR STATION | CAMBRIDGE, Guernsey, OH | Pass | State |
| 2026-03-11 | LEHIGH WHITE CEMENT CO LLC/YORK | YORK, York, PA | Pass | State |
| 2026-03-11 | WILLIAMS FIELD SVC CO LLC/WILCOX COMP STA | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2026-03-11 | EXPAND OPERATING LLC/BLYE WELL PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-03-11 | CLEAN ENERGY EXPL & PROD LLC/WHISPERING PINES WELL PAD | WELLSBORO, Tioga, PA | Pass | State |
| 2026-03-11 | NEW-INDY CATAWBA LLC | CATAWBA, York, SC | Pass | State |
| 2026-03-11 | COLUMBIA GAS TRANSMISSION CORP EMPORIA | GREENSVILLE, Greensville, VA | Pass | State |
| 2026-03-11 | HRSD - WILLIAMSBURG WASTEWATER TREATMENT PLANT | WILLIAMSBURG, James City, VA | Pass | State |
| 2026-03-11 | SI NVA05A, LLC AND SI NVA05D, LLC — high-priority violation on file | MANASSAS, Manassas (city), VA | Pass | State |
| 2026-03-11 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-03-11 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-11 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-03-11 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2026-03-11 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2026-03-11 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2026-03-11 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2026-03-10 | HILCORP ALASKA, LLC / NIKAITCHUQ DEVELOPMENT | NORTH SLOPE BOROUGH, North Slope, AK | Fail | State |
| 2026-03-10 | RESOLUTE FP US INC. | COOSA PINES, Talladega, AL | Pass | State |
| 2026-03-10 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-2 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-03-10 | DESOTO GATHERING COMPANY, LLC - WEST CUTTHROAT CPF-2 | QUITMAN, Cleburne, AR | Pass | State |
| 2026-03-10 | ET ENERGY & PROCESSING LLC. - BONANZA COMPRESSOR STATION | BONANZA, Sebastian, AR | Pass | State |
| 2026-03-10 | ET ENERGY & PROCESSING LLC. - BONANZA COMPRESSOR STATION | BONANZA, Sebastian, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
| 2026-03-10 | APAC CENTRAL, INC. - SHARPS CRUSHER | CITY OF SPRINGDALE, Washington, AR | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.