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 |
|---|---|---|---|---|
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Fail | State |
| 2026-06-08 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-08 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-08 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-08 | GULFPORT APPALACHIA, LLC - YANKEE WELL PAD | JACOBSBURG, Belmont, OH | Pass | State |
| 2026-06-08 | BLUE RACER MIDSTREAM LLC - BFS#2 (FLUSHING A) | FLUSHING, Belmont, OH | Pass | State |
| 2026-06-08 | BLUE RACER MIDSTREAM LLC - BFS#2 (FLUSHING A) | FLUSHING, Belmont, OH | Pass | State |
| 2026-06-08 | BLUE RACER MIDSTREAM LLC - BFS#2 (FLUSHING A) | FLUSHING, Belmont, OH | Pass | State |
| 2026-06-08 | UGI TEXAS CREEK LLC/CASTLE COMP STA | CANTON, Bradford, PA | Pass | State |
| 2026-06-08 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-08 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-08 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-06-07 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-07 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-07 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-07 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-06 | FREEPORT MCMORAN - MIAMI SMELTER | MIAMI, Gila, AZ | Pass | State |
| 2026-06-05 | FLORIDA GAS TRANSMISSION CO | MOUNT VERNON, Mobile, AL | Pass | State |
| 2026-06-05 | SUMMIT COUNTY LANDFILL | DILLON AREA, Summit, CO | Pass | State |
| 2026-06-05 | DOYLE ENERGY FACILITY | MONROE, Walton, GA | Pass | State |
| 2026-06-05 | SUPERIOR METAL TECHNOLOGIES | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-06-05 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-05 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-05 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-05 | RIETH RILEY CONSTRUCTION COMPANY INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2026-06-05 | MONOGRAM GOURMET FOODS | WILMINGTON, Middlesex, MA | Pending | State |
| 2026-06-05 | MONOGRAM GOURMET FOODS | WILMINGTON, Middlesex, MA | Pending | State |
| 2026-06-05 | WILLISTON BASIN - HATHAWAY STATION | HATHAWAY, Rosebud, MT | Pass | State |
| 2026-06-05 | WILLISTON BASIN - HATHAWAY STATION | HATHAWAY, Rosebud, MT | Pass | State |
| 2026-06-05 | WILLISTON BASIN - CABIN CREEK | BAKER, Fallon, MT | Pass | State |
| 2026-06-05 | FIRST BROAD RIVER WASTEWATER TREATMENT PLANT | SHELBY, Cleveland, NC | Pass | State |
| 2026-06-05 | YATES BUFFALOE WOOD PROCESSING FACILITY (ACI) | RALEIGH, Wake, NC | Pass | State |
| 2026-06-05 | EMD ACQUISITION, LLC — high-priority violation on file | HENDERSON, Clark, NV | Pass | Local |
| 2026-06-05 | HILCORP ENERGY - ELK RUN BAKER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-06-05 | HILCORP ENERGY - ELK RUN BAKER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-06-05 | HILCORP ENERGY - ELK RUN BAKER PRODUCTION FACILITY | LISBON, Columbiana, OH | Pass | State |
| 2026-06-05 | ROLLAND PAD 952787 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-05 | ROLLAND PAD 952787 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-05 | ROLLAND PAD 952787 | SARDIS, Monroe, OH | Pass | State |
| 2026-06-05 | EXPAND OPERATING LLC/ROSIEMAR SUS PAD | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2026-06-05 | DARLING INGREDIENTS BASTROP | BASTROP, Bastrop, TX | N/A | State |
| 2026-06-05 | ASH GROVE CEMENT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-06-05 | ASH GROVE CEMENT | MIDLOTHIAN, Ellis, TX | Pass | State |
| 2026-06-05 | CLEBURNE PLANT | CLEBURNE, Johnson, TX | Pass | State |
| 2026-06-05 | CLEBURNE PLANT | CLEBURNE, Johnson, TX | Pass | State |
| 2026-06-05 | CLEBURNE PLANT | CLEBURNE, Johnson, TX | Pass | State |
| 2026-06-05 | CLEBURNE PLANT | CLEBURNE, Johnson, TX | Pass | State |
| 2026-06-05 | CLEBURNE PLANT | CLEBURNE, Johnson, TX | Pass | State |
| 2026-06-05 | WEATHERFORD PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-06-05 | WEATHERFORD PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-06-05 | BRIDGEPORT GAS PLANT | BRIDGEPORT, Wise, TX | Pass | State |
| 2026-06-05 | WE ENERGIES - WHITEWATER GENERATING STATION | WHITEWATER, Jefferson, WI | Pass | State |
| 2026-06-05 | WILLIAMS OHIO VALLEY MIDSTREAM LLC, OAK GROVE | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2026-06-04 | SABIC INNOVATIVE PLASTICS US LLC | BURKVILLE, Lowndes, AL | Pass | State |
| 2026-06-04 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-1 | CLEVELAND, Conway, AR | Pass | State |
| 2026-06-04 | DESOTO GATHERING COMPANY LLC - SOUTH BROWNIE CPF 2 | HATTIEVILLE, Conway, AR | Pass | State |
| 2026-06-04 | ANTHONY TIMBERLANDS, INC. - MALVERN | MALVERN, Hot Spring, AR | Pass | State |
| 2026-06-04 | SUZANO PACKAGING, LLC | PINE BLUFF, Jefferson, AR | Pass | State |
| 2026-06-04 | SUZANO PACKAGING, LLC | PINE BLUFF, Jefferson, AR | Pass | State |
| 2026-06-04 | SUZANO PACKAGING, LLC | PINE BLUFF, Jefferson, AR | Pass | State |
| 2026-06-04 | SUZANO PACKAGING, LLC | PINE BLUFF, Jefferson, AR | Pass | State |
| 2026-06-04 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2026-06-04 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2026-06-04 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-04 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-04 | FLORIDA GAS TRANSMISSION COMPANY, LLC | MILTON, Santa Rosa, FL | Pass | State |
| 2026-06-04 | SABAL TRAIL TRANSMISSION, LLC. | HILDRETH, Suwannee, FL | Pass | State |
| 2026-06-04 | SABAL TRAIL TRANSMISSION, LLC. | HILDRETH, Suwannee, FL | Pass | State |
| 2026-06-04 | SABAL TRAIL TRANSMISSION, LLC. | HILDRETH, Suwannee, FL | Pass | State |
| 2026-06-04 | DOYLE ENERGY FACILITY | MONROE, Walton, GA | Pass | State |
| 2026-06-04 | LSCP LP DBA LITTLE SIOUX CORN PROCESSORS — high-priority violation on file | MARCUS, Cherokee, IA | Pass | State |
| 2026-06-04 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pending | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pending | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pass | State |
| 2026-06-04 | CORINTH TREATING PLANT | THOMPSONVILLE, Williamson, IL | Pass | State |
| 2026-06-04 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-04 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Fail | State |
| 2026-06-04 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2026-06-04 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-06-04 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-06-04 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-06-04 | CLEVELAND-CLIFFS STEEL LLC | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-06-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-06-04 | SUPERIOR METAL TECHNOLOGIES | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-06-04 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-04 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-04 | UNIVERSAL BEARINGS LLC — high-priority violation on file | BREMEN, Marshall, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
| 2026-06-04 | BUNGE NORTH AMERICA (EAST), LLC — high-priority violation on file | MORRISTOWN, Shelby, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.