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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.