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 |
|---|---|---|---|---|
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | WELLHEAD POWER PANOCHE, LLC — high-priority violation on file | FIREBAUGH, Fresno, CA | Pass | Local |
| 2025-10-29 | LARAMIE ENERGY - CONN CREEK GAS — high-priority violation on file | PARACHUTE 10.1 MI. W OF, Garfield, CO | Pass | State |
| 2025-10-29 | PLAINS END, LLC | ARVADA, Jefferson, CO | Pass | State |
| 2025-10-29 | UTAH GAS - DRAGON TRAIL — high-priority violation on file | RANGELY 16.7 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-10-29 | COLORADO INTERSTATE GAS CO - CHEYENNE CS — high-priority violation on file | NUNN 14.8 MI. N OF, Weld, CO | Pass | State |
| 2025-10-29 | PUBLIC SERV - ROCKY MOUNTAIN ENERGY | HUDSON AREA, Weld, CO | Pass | State |
| 2025-10-29 | BONANZA CREEK - STATE ANTELOPE CPF O-1 | KERSEY 14.0 MI. E OF, Weld, CO | Fail | State |
| 2025-10-29 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-10-29 | GB II NEW HAVEN, LLC - NEW HAVEN HARBOR STATION | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-10-29 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-10-29 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-10-29 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-10-29 | FLOWERS BAKERY OF VILLA RICA, LLC | VILLA RICA, Carroll, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | GRP FRANKLIN, LLC | CARNESVILLE, Franklin, GA | Pass | State |
| 2025-10-29 | PIEDMONT GREEN POWER, LLC | BARNESVILLE, Lamar, GA | Pass | State |
| 2025-10-29 | PIEDMONT GREEN POWER, LLC | BARNESVILLE, Lamar, GA | Pass | State |
| 2025-10-29 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-10-29 | EAST PENN MFG CO INC | CORYDON, Wayne, IA | Pass | State |
| 2025-10-29 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Fail | State |
| 2025-10-29 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-10-29 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Fail | State |
| 2025-10-29 | ARCHER DANIELS MIDLAND COMPANY — high-priority violation on file | FRANKFORT, Clinton, IN | Pass | State |
| 2025-10-29 | ANR PIPELINE COMPANY ST JOHN COMPRESSOR STATION | SAINT JOHN, Lake, IN | Pass | State |
| 2025-10-29 | ANR PIPELINE COMPANY ST JOHN COMPRESSOR STATION | SAINT JOHN, Lake, IN | Pass | State |
| 2025-10-29 | UNITED STATES GYPSUM COMPANY — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2025-10-29 | UNITED STATES GYPSUM COMPANY — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2025-10-29 | UNITED STATES GYPSUM COMPANY — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2025-10-29 | UNITED STATES GYPSUM COMPANY — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | ARCOSA LW HPB LLC — high-priority violation on file | MOORESVILLE, Morgan, IN | Pass | State |
| 2025-10-29 | AUGUSTA MUN. POWER PLANT #2 (AIR) — high-priority violation on file | AUGUSTA, Butler, KS | Pass | State |
| 2025-10-29 | PUREFIELD INGREDIENTS (1030 EAST)(AIR) | RUSSELL, Russell, KS | Pass | State |
| 2025-10-29 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2025-10-29 | P & G GILLETTE | BOSTON, CITY OF, Suffolk, MA | Pass | State |
| 2025-10-29 | THE JACKSON LABORATORY | BAR HARBOR, Hancock, ME | Pass | State |
| 2025-10-29 | GREAT LAKES GAS TRANSMISSION STATION #13 | OTISVILLE, Genesee, MI | Pass | State |
| 2025-10-29 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-10-29 | AMRIZE MIDWEST INC - NONMETALLIC | EAGAN, Dakota, MN | Pass | State |
| 2025-10-29 | BOISE WHITE PAPER LLC | INTERNATIONAL FALLS, Koochiching, MN | Pass | State |
| 2025-10-29 | SOUTHERN MINNESOTA BEET SUGAR COOP | RENVILLE, Renville, MN | Pass | State |
| 2025-10-29 | FREDERICKTOWN ENERGY CENTER | FREDERICKTOWN, Madison, MO | N/A | State |
| 2025-10-29 | FREDERICKTOWN ENERGY CENTER | FREDERICKTOWN, Madison, MO | Pass | State |
| 2025-10-29 | FREDERICKTOWN ENERGY CENTER | FREDERICKTOWN, Madison, MO | Pass | State |
| 2025-10-29 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Fail | State |
| 2025-10-29 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-29 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-29 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-29 | GASTON COUNTY LANDFILL - HARDIN SITE | DALLAS, Gaston, NC | Pass | State |
| 2025-10-29 | LINAM RANCH GAS PLANT | HOBBS, Lea, NM | N/A | State |
| 2025-10-29 | FRAC CAT COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-10-29 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-10-29 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Fail | State |
| 2025-10-29 | OVER THE LINE COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-10-29 | VARFLEX CORPORATION | ROME, Oneida, NY | Pass | State |
| 2025-10-29 | PVS CHEMICAL SOLUTIONS INC | BUFFALO, Erie, NY | Pass | State |
| 2025-10-29 | LIBERTY CASTING INC. — high-priority violation on file | DELAWARE, Delaware, OH | Pass | State |
| 2025-10-29 | LIBERTY CASTING INC. — high-priority violation on file | DELAWARE, Delaware, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | EQM OLYMPUS MIDSTREAM, LLC - TYGERR COMPRESSOR STATION | JACOBSBURG, Belmont, OH | Pass | State |
| 2025-10-29 | RICE DRILLING D LLC - DANGEL PAD | SARDIS, Monroe, OH | Pass | State |
| 2025-10-29 | RICE DRILLING D LLC - DANGEL PAD | SARDIS, Monroe, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.