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 |
|---|---|---|---|---|
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | SUNCOR ENERGY - DENVER REFINERY — high-priority violation on file | COMMERCE CITY, Adams, CO | Pass | State |
| 2025-08-19 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2025-08-19 | DEVON POWER LLC | DEVON, New Haven, CT | Pass | State |
| 2025-08-19 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE | NORWICH, New London, CT | Pass | State |
| 2025-08-19 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE | NORWICH, New London, CT | Pass | State |
| 2025-08-19 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-08-19 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-08-19 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-08-19 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-08-19 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-08-19 | JAX LNG LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-08-19 | FLORIDA POWER & LIGHT COMPANY | PENSACOLA, Escambia, FL | Pass | State |
| 2025-08-19 | WEST FRASER, INC | MCDAVID, Escambia, FL | Pass | State |
| 2025-08-19 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2025-08-19 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2025-08-19 | CITGO PETROLEUM CORPORATION | TAMPA, Hillsborough, FL | Pass | State |
| 2025-08-19 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2025-08-19 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2025-08-19 | GEORGIA POWER CO. - PLANT MCDONOUGH- ATKINSON | ATLANTA, Cobb, GA | Pass | State |
| 2025-08-19 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2025-08-19 | PCS NITROGEN FERTILIZER L.P. - AUGUSTA PLANT | AUGUSTA, Richmond, GA | Pass | State |
| 2025-08-19 | DOYLE ENERGY FACILITY | MONROE, Walton, GA | Pass | State |
| 2025-08-19 | LOPAREX INC | IOWA CITY, Johnson, IA | Pass | State |
| 2025-08-19 | RIVERSIDE CASINO & GOLF RESORT LLC | WASHINGTON, Washington, IA | Pass | State |
| 2025-08-19 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-08-19 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-08-19 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-08-19 | ADM CORN PROCESSING | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-08-19 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2025-08-19 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2025-08-19 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2025-08-19 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2025-08-19 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2025-08-19 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2025-08-19 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2025-08-19 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2025-08-19 | THE ANDERSONS RENEWABLES LLC — high-priority violation on file | LOGANSPORT, Cass, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | JASPER RUBBER PRODUCTS INC — high-priority violation on file | JASPER, Dubois, IN | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY DBA VALERO LINDEN PLANT | LINDEN, Montgomery, IN | Pass | State |
| 2025-08-19 | NOVELIS | BEREA, Madison, KY | Pass | State |
| 2025-08-19 | SHREWSBURY ELECTRIC AND CABLE OPERATIONS | SHREWSBURY, TOWN OF, Worcester, MA | Pass | State |
| 2025-08-19 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2025-08-19 | GM TECHNICAL CENTER | WARREN, Macomb, MI | Pass | State |
| 2025-08-19 | XCEL ENERGY - PRAIRIE ISLAND NUCLEAR PLANT | WELCH, Goodhue, MN | Pass | State |
| 2025-08-19 | GREEN PLAINS OTTER TAIL LLC | FERGUS FALLS, Otter Tail, MN | Pass | State |
| 2025-08-19 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2025-08-19 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pass | State |
| 2025-08-19 | GASTON COUNTY LANDFILL - HARDIN SITE | DALLAS, Gaston, NC | Pending | State |
| 2025-08-19 | CITY OF HIGH POINT - EASTSIDE WASTEWATER TREATMENT PLANT | JAMESTOWN, Guilford, NC | Pending | State |
| 2025-08-19 | GREDE II - BISCOE, LLC — high-priority violation on file | BISCOE, Montgomery, NC | Pass | State |
| 2025-08-19 | OTTER TAIL POWER COMPANY - COYOTE STATION - AQ | BEULAH, Mercer, ND | Pass | State |
| 2025-08-19 | VALERO RENEWABLE FUELS COMPANY — high-priority violation on file | ALBION, Boone, NE | N/A | State |
| 2025-08-19 | ADM CORN PROCESSING — high-priority violation on file | COLUMBUS, Platte, NE | Pass | State |
| 2025-08-19 | NE RENEWABLE POWER TAMWORTH — high-priority violation on file | TAMWORTH, Carroll, NH | Pass | State |
| 2025-08-19 | NE RENEWABLE POWER TAMWORTH — high-priority violation on file | TAMWORTH, Carroll, NH | Pass | State |
| 2025-08-19 | DIMENSIONS 6 GAS LIFT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-08-19 | DIMENSIONS 6 GAS LIFT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-08-19 | PECOS RIVER COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-08-19 | EOG RESOURCES, INC. - KITZMILLER CL KNX PAD | SALEM, Columbiana, OH | Pass | State |
| 2025-08-19 | EOG RESOURCES, INC. - KITZMILLER CL KNX PAD | SALEM, Columbiana, OH | Pass | State |
| 2025-08-19 | EOG RESOURCES, INC. - KITZMILLER CL KNX PAD | SALEM, Columbiana, OH | Pass | State |
| 2025-08-19 | DE NORA TECH MANUFACTURING FACILITY | MENTOR, Lake, OH | Pass | State |
| 2025-08-19 | DE NORA TECH MANUFACTURING FACILITY | MENTOR, Lake, OH | Pass | State |
| 2025-08-19 | DE NORA TECH MANUFACTURING FACILITY | MENTOR, Lake, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | BLUE RACER MIDSTREAM, LLC - WOLF RUN COMPRESSOR STATION | BUFFALO, TOWNSHIP OF, Noble, OH | Pass | State |
| 2025-08-19 | ASCENT RESOURCES - UTICA LLC - ROXY CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.