EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-18 | 40 LCID, LLC (ACI) | STATESVILLE, Iredell, NC | Pass | State |
| 2025-12-18 | NPPD SHELDON STATION | HALLAM, Lancaster, NE | Pass | Local |
| 2025-12-18 | WILDCAT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-18 | WILDCAT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-18 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-18 | LONGWOOD - STATELINE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-18 | PONCHO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-18 | PONCHO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-18 | LESLIE FEDERAL EAST FACILITY | JAL, Lea, NM | Pass | State |
| 2025-12-18 | GCC RIO GRANDE INC-TIJERAS PLANT | TIJERAS, Bernalillo, NM | Pass | Local |
| 2025-12-18 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-18 | REVERE COPPER PRODUCTS INC | ROME, Oneida, NY | Fail | State |
| 2025-12-18 | ROCHESTER TERMINAL | ROCHESTER, Monroe, NY | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | IMPERIAL ALUMINUM - MINERVA, LLC — high-priority violation on file | MINERVA, Carroll, OH | Pass | State |
| 2025-12-18 | LSC COMMUNICATIONS BOOK, WILLARD | WILLARD, Huron, OH | Pass | State |
| 2025-12-18 | OSCO INC.-JACKSON DIVISION | JACKSON, Jackson, OH | Pass | State |
| 2025-12-18 | APEX LFG ENERGY, LLC | AMSTERDAM, Jefferson, OH | Pass | State |
| 2025-12-18 | APEX LFG ENERGY, LLC | AMSTERDAM, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-18 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-12-18 | BCE MACH III MIDSTREAM HOLDINGS LLC / NORTH OF LINCOLN COMPRESSOR STATION | CRESCENT, Kingfisher, OK | Fail | State |
| 2025-12-18 | NORTH AMERICAN HOGANAS INC/STONY CREEK PLT | HOLLSOPPLE, Somerset, PA | Pass | State |
| 2025-12-18 | UNITED REFINING CO/WARREN PLT | WARREN, Warren, PA | Pass | State |
| 2025-12-18 | DUNMORE INTERNATIONAL CORP/BRISTOL | BRISTOL, Bucks, PA | Pass | State |
| 2025-12-18 | PERDUE AGRIBUSINESS LLC/BAINBRIDGE — high-priority violation on file | MARIETTA, Lancaster, PA | Pass | State |
| 2025-12-18 | EXPAND OPERATING LLC/WR-64 FIONDI PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-12-18 | ALLENDALE BIOMASS LLC | FAIRFAX, Allendale, SC | Pass | State |
| 2025-12-18 | GULF COAST GROWTH VENTURES PROJECT | GREGORY, San Patricio, TX | N/A | State |
| 2025-12-18 | NORTHRUP GRUMMAN SYSTEMS - PROMONTORY (FORMERLY ATK) | PROMONTORY (HISTORICAL), Box Elder, UT | Pass | State |
| 2025-12-18 | CHEVRON USA | UTAH, Undetermined, UT | Pass | State |
| 2025-12-18 | CHEVRON USA | UTAH, Undetermined, UT | Pass | State |
| 2025-12-18 | AMRIZE CEMENT/FORMERLY HOLCIM (US), INC. — high-priority violation on file | MORGAN, Morgan, UT | Pass | State |
| 2025-12-18 | WALMART SUPERCENTER #2645 | BLACKSTONE, Nottoway, VA | Fail | State |
| 2025-12-18 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | MORGAN DRAW/CRENSHAW HILL (PRONGHORN MIDSTREAM LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-18 | CKN-ROCK SPRINGS STATION (MOUNTAIN WEST PIPELINE, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-18 | WORLAND FACTORY (WYOMING SUGAR CO.) | WORLAND, Washakie, WY | Pass | State |
| 2025-12-17 | CROSSVILLE PELLETS, LLC — high-priority violation on file | CROSSVILLE, DeKalb, AL | Pass | State |
| 2025-12-17 | CEMEX SOUTHEAST LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-12-17 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2025-12-17 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Pass | State |
| 2025-12-17 | LSB CHEMICAL LLC | EL DORADO, Union, AR | Fail | State |
| 2025-12-17 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2025-12-17 | PINTO VALLEY MINE | MIAMI, Gila, AZ | Pass | State |
| 2025-12-17 | FREEPORT-MCMORAN - MORENCI | MORENCI, Greenlee, AZ | Pass | State |
| 2025-12-17 | INTEL CORP - OCOTILLO CAMPUS — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | STOCKTON RWCF — high-priority violation on file | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-12-17 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2025-12-17 | DCP OPERATING CO - O'CONNOR GAS PLANT | KERSEY AREA, Weld, CO | Pass | State |
| 2025-12-17 | BONANZA CRK ENERGY - NORTH PLATTE 24-34 | KERSEY 6.1 MI. N OF, Weld, CO | N/A | State |
| 2025-12-17 | BONANZA CRK ENERGY - NORTH PLATTE 24-34 | KERSEY 6.1 MI. N OF, Weld, CO | Pass | State |
| 2025-12-17 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-17 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-17 | AMGRAPH PACKAGING, INC. | WATERTOWN, Litchfield, CT | Pass | State |
| 2025-12-17 | GLOBAL COMPANIES LLC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2025-12-17 | BUCKEYE TERMINALS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-17 | BUCKEYE TERMINALS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-17 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-17 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-17 | NORTHERN BORDER PIPELINE CO | CHANNAHON, Will, IL | Pass | State |
| 2025-12-17 | CWA AUTHORITY INC BELMONT ADV WASTEWATER TREATMENT PLANT | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-17 | OAK GROVE POWER PRODUCERS (AIR) | ARCADIA, Crawford, KS | Pass | State |
| 2025-12-17 | CRRM REFINERY (AIR) | COFFEYVILLE, Montgomery, KS | Pass | State |
| 2025-12-17 | LOUISVILLE GAS & ELECTRIC | MAGNOLIA, Larue, KY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.