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 |
|---|---|---|---|---|
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | MODESTO IRRIGATION UNIT 1&2 | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-09 | COLORADO INTERSTATE GAS- KIT CARSON C.S. | KIT CARSON 6.6 MI. S OF, Cheyenne, CO | Pass | State |
| 2025-09-09 | COLORADO INTERSTATE GAS- KIT CARSON C.S. | KIT CARSON 6.6 MI. S OF, Cheyenne, CO | Pass | State |
| 2025-09-09 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-09 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-09-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-09-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-09-09 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-09-09 | FLORIDA POWER & LIGHT | FORT MYERS, Lee, FL | Pass | State |
| 2025-09-09 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2025-09-09 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-09-09 | GERDAU AMERISTEEL US INC. | CARTERSVILLE, Bartow, GA | Pass | State |
| 2025-09-09 | SONOCO PRODUCTS - TEMPLE | TEMPLE, Carroll, GA | Pass | State |
| 2025-09-09 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-09 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-09 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-09 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-09 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-09 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2025-09-09 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-09 | KIA GEORGIA, INC. | WEST POINT, Troup, GA | Pass | State |
| 2025-09-09 | JOHN DEERE FOUNDRY WATERLOO | WATERLOO, Black Hawk, IA | Pass | State |
| 2025-09-09 | ILC RESOURCES/IOWA LIMESTONE CO-PLTS 1&3 | ALDEN, Hardin, IA | Pass | State |
| 2025-09-09 | IOWA FERTILIZER CO — high-priority violation on file | WEVER, Lee, IA | Pass | State |
| 2025-09-09 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2025-09-09 | ARCHER DANIELS MIDLAND DM SOYBEAN PLANT | DES MOINES, Polk, IA | Pass | Local |
| 2025-09-09 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2025-09-09 | GENEVA GENERATING PLANT | GENEVA, Kane, IL | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-09 | MPLX TERMINALS LLC - MUNCIE TERMINAL | MUNCIE, Delaware, IN | Pass | State |
| 2025-09-09 | PRECOAT METALS | LA PORTE, LaPorte, IN | Pass | State |
| 2025-09-09 | VANDERBILT CHEMICALS LLC | MURRAY, Calloway, KY | Pass | State |
| 2025-09-09 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2025-09-09 | DIVERSIFIED MIDSTREAM LLC - MYRA COMPRESSOR STATION | MYRA, Pike, KY | Pass | State |
| 2025-09-09 | DIVERSIFIED MIDSTREAM LLC - MYRA COMPRESSOR STATION | MYRA, Pike, KY | Pass | State |
| 2025-09-09 | METTIKI COAL, LLC | OAKLAND, Garrett, MD | Pass | State |
| 2025-09-09 | VENICE PARK RDF | LENNON, Shiawassee, MI | Pass | State |
| 2025-09-09 | BLUEWATER GAS STORAGE FACILITY - COLUMBUS | COLUMBUS, St. Clair, MI | Pass | State |
| 2025-09-09 | BLUE EARTH LIGHT AND WATER | BLUE EARTH, Faribault, MN | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | GULF SOUTH PIPELINE COMPANY LLC, PETAL COMPRESSOR STATION | PETAL, Forrest, MS | Pass | State |
| 2025-09-09 | MISSISSIPPI POWER COMPANY, DAVID M RATCLIFFE | DEKALB, Kemper, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-09 | LAMPE & MALPHRUS LUMBER COMPANY | SMITHFIELD, Johnston, NC | Pass | State |
| 2025-09-09 | CARGILL, INC. - CARGILL OILSEEDS PROCESSING - AQ | WEST FARGO, Cass, ND | Pass | State |
| 2025-09-09 | HILAND PARTNERS HOLDINGS LLC - 4RUNNER COMPRESSOR STATION | WILLISTON, Williams, ND | Pass | State |
| 2025-09-09 | CARGILL INC — high-priority violation on file | BLAIR, Washington, NE | Pass | State |
| 2025-09-09 | WHITEHORN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-09 | WHITEHORN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-09 | WILMA CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.