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 |
|---|---|---|---|---|
| 2025-09-15 | CITY OF GAINESVILLE, GRU — high-priority violation on file | GAINESVILLE, Alachua, FL | Pass | State |
| 2025-09-15 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2025-09-15 | CRANE & COMPANY INC | DALTON, TOWN OF, Berkshire, MA | Incomplete | State |
| 2025-09-15 | US STEEL CORP - MINNTAC | MOUNTAIN IRON, St. Louis, MN | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-09-15 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pass | State |
| 2025-09-15 | MAGNUM COMPRESSOR STATION — high-priority violation on file | CARLSBAD, Eddy, NM | Pass | State |
| 2025-09-15 | REDHAWK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-15 | REDHAWK COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - WALDO MNR GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - WALDO MNR GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - WALDO MNR GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - WALDO MNR GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - WALDO MNR GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - WALDO MNR GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - COOPER WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - COOPER WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - COOPER WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - COOPER WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - COOPER WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | ASCENT RESOURCES - UTICA LLC - COOPER WSG GR | KIMBOLTON, Guernsey, OH | Pass | State |
| 2025-09-15 | TARGA PIPELINE MIDCONTINENT LLC / GRAHAM COMPRESSOR STATION | GRAHAM, Carter, OK | Pass | State |
| 2025-09-15 | BCE MACH III LLC / BENDA 3 16 6 1 2 5 7HO PAD | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-09-15 | BCE MACH III LLC / LANKARD FAMILY 3 16 6 3HO 3 16 6 4HO 3 | KINGFISHER, Kingfisher, OK | Pass | State |
| 2025-09-15 | FORMENTERA OPERATIONS / DERR 36 1 | CASHION, Kingfisher, OK | Pass | State |
| 2025-09-15 | TARGA PIPELINE MIDCONTINENT LLC / GOFF COMPRESSOR STATION | LITTLE CITY, Marshall, OK | Pass | State |
| 2025-09-15 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | N/A | State |
| 2025-09-15 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-15 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-15 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-15 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-15 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-15 | NORTHERN STATES PWR CO WHEATON GEN STA | EAU CLAIRE, Chippewa, WI | Pass | State |
| 2025-09-15 | MULLINS CHEESE INC — high-priority violation on file | MOSINEE, Marathon, WI | Pass | State |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | CHEVRON U.S.A. INC. | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | NLMK INDIANA — high-priority violation on file | PORTAGE, Porter, IN | Pass | State |
| 2025-09-13 | MOCKINGBIRD COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-09-13 | MOCKINGBIRD COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-09-12 | GRAYSON CARTER AND SON CONTRACTING, INC. | LACEYS SPRING, Morgan, AL | Pass | State |
| 2025-09-12 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-09-12 | DESOTO GATHERING COMPANY LLC - CHARLEY CPF-3 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2025-09-12 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-09-12 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-09-12 | CORONADO GENERATING PLANT | SAINT JOHNS, Apache, AZ | Pass | State |
| 2025-09-12 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-09-12 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-12 | HECO - WAIAU | PEARL CITY, Honolulu, HI | Pass | State |
| 2025-09-12 | AMES MUNICIPAL UTILITIES & COMBUST TURB | AMES, Story, IA | Pass | State |
| 2025-09-12 | US ENERGY MT PROSPECT TERMINAL | ARLINGTON HEIGHTS, Cook, IL | Pass | State |
| 2025-09-12 | CPV MARYLAND, LLC - ST. CHARLES PROJECT | WALDORF, Charles, MD | Pass | State |
| 2025-09-12 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-12 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-12 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-12 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-12 | APAC MISSISSIPPI INC, YAZOO CITY ASPHALT | YAZOO CITY, Yazoo, MS | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
| 2025-09-12 | BLAINE COUNTY #1 | CHINOOK, Blaine, MT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.