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 |
|---|---|---|---|---|
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA LLC - KALDOR UNIT 1H | MEAD, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | ASCENT RESOURCES - UTICA, LLC - KEMPER | BELLAIRE, Belmont, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | THREE RIVERS ENERGY, LLC | COSHOCTON, Coshocton, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | WILLIAMS ARCHER COMPRESSOR STATION | CADIZ, Harrison, OH | Pass | State |
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
| 2025-12-11 | PROCTER & GAMBLE MASON BUSINESS & INNOVATION CENTER | MASON, Warren, OH | Pass | State |
| 2025-12-11 | CALUMET KARNS CITY REF LLC/KARNS CITY | KARNS CITY, Butler, PA | Pass | State |
| 2025-12-11 | EASTERN GAS TRANS & STORAGE INC/ARDELL COMP STA/ELK | WEEDVILLE, Elk, PA | Pass | State |
| 2025-12-11 | TEXAS EASTERN TRANS LP/PERULACK STA | EAST WATERFORD, Juniata, PA | Pass | State |
| 2025-12-11 | HATFIELD TWP MUNI AUTH/COLMAR | COLMAR, Montgomery, PA | Fail | State |
| 2025-12-11 | OWEN ELECTRIC STEEL COMPANY OF SOUTH CAROLINA | CAYCE, Lexington, SC | Pass | State |
| 2025-12-11 | BMW MANUFACTURING CO LLC | GREER, Greenville, SC | Pass | State |
| 2025-12-11 | GARLAND MUNICIPAL POWER - RAY OLINGER PLANT | NEVADA, Collin, TX | Pass | State |
| 2025-12-11 | GARLAND MUNICIPAL POWER - RAY OLINGER PLANT | NEVADA, Collin, TX | Pass | State |
| 2025-12-11 | GARLAND MUNICIPAL POWER - RAY OLINGER PLANT | NEVADA, Collin, TX | Pass | State |
| 2025-12-11 | WOLF HOLLOW II | GRANBURY, Hood, TX | Pass | State |
| 2025-12-11 | WOLF HOLLOW II | GRANBURY, Hood, TX | Pass | State |
| 2025-12-11 | ROSS COMPRESSOR STATION | RHOME, Wise, TX | Pass | State |
| 2025-12-11 | KENNECOTT MAIN STACK, SMELTER AND | BINGHAM CANYON, Salt Lake, UT | Pass | State |
| 2025-12-11 | DIGITAL REALTY (DIGITAL LOUDOUN 3 & 4, LLC) | ASHBURN, Loudoun, VA | Pass | State |
| 2025-12-11 | WALMART SUPERCENTER #5488 | NORFOLK, Norfolk (city), VA | Fail | State |
| 2025-12-11 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-12-11 | UNIROYAL GLOBAL ENGINEERED PRODUCTS LLC — high-priority violation on file | STOUGHTON, Dane, WI | Pass | State |
| 2025-12-11 | EQT XL MIDSTREAM OPERATING LLC, LEGACY CONDENSATE PAD | PROCTOR, Marshall, WV | Pass | State |
| 2025-12-10 | ESSITY PROFESSIONAL HYGIENE NA LLC | CHEROKEE, Colbert, AL | Pass | State |
| 2025-12-10 | ESSITY PROFESSIONAL HYGIENE NA LLC | CHEROKEE, Colbert, AL | Pass | State |
| 2025-12-10 | AM/NS CALVERT LLC | CALVERT, Mobile, AL | Pass | State |
| 2025-12-10 | ALABAMA POWER COMPANY | WILSONVILLE, Shelby, AL | Pass | State |
| 2025-12-10 | HUNT REFINING COMPANY | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-12-10 | HUNT REFINING COMPANY | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-12-10 | TAMKO BUILDING PRODUCTS LLC | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-12-10 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-1 | SEARCY, White, AR | Pass | State |
| 2025-12-10 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-2 | PANGBURN, White, AR | Pass | State |
| 2025-12-10 | NATURESWEET USA, LLC - WILLCOX FACILITY | WILLCOX, Graham, AZ | Pass | State |
| 2025-12-10 | NUCOR STEEL KINGMAN | KINGMAN, Mohave, AZ | Pass | State |
| 2025-12-10 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-12-10 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2025-12-10 | QB ENERGY OPERATING - K24 496 | PARACHUTE 15.5 MI. N OF, Garfield, CO | Pending | State |
| 2025-12-10 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | N/A | State |
| 2025-12-10 | DCP OPERATING CO - LUCERNE 2 GAS PLANT — high-priority violation on file | GREELEY AREA, Weld, CO | N/A | State |
| 2025-12-10 | COVIDIEN LP | NORTH HAVEN, New Haven, CT | Pass | State |
| 2025-12-10 | TRANSMONTAIGNE TERMINALS, LLC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2025-12-10 | KRAFT HEINZ FOODS COMPANY | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-10 | BUCKEYE TERMINALS, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-12-10 | NUCOR STEEL FLORIDA, INC. | FROSTPROOF, Polk, FL | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-10 | STERIGENICS U.S. LLC | ATLANTA, Cobb, GA | Pass | State |
| 2025-12-10 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-10 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-10 | ACTIVE MINERALS INTERNATIONAL - MAIN PLANT | GORDON, Wilkinson, GA | Pass | State |
| 2025-12-10 | ACTIVE MINERALS INTERNATIONAL - MAIN PLANT | GORDON, Wilkinson, GA | Pass | State |
| 2025-12-10 | GREEN PLAINS SHENANDOAH LLC (GP SHENANDOAH) | SHENANDOAH, Fremont, IA | Pass | State |
| 2025-12-10 | CARGILL INC-IOWA FALLS | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-10 | ANR PIPELINE COMPANY SULPHUR SPRINGS COMPRESSOR STATION | SULPHUR SPRINGS, Henry, IN | Pass | State |
| 2025-12-10 | HOLLYFRONTIER EL DORADO REFINERY (AIR) | EL DORADO, Butler, KS | Pass | State |
| 2025-12-10 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2025-12-10 | NEXPERA LLC - NEXPERA-BURNSIDE FACILITY | DARROW, Ascension, LA | Pass | State |
| 2025-12-10 | CHEVRON ORONITE CO LLC - OAK POINT PLANT | BELLE CHASSE, Plaquemines, LA | Pass | State |
| 2025-12-10 | VICINITY ENERGY BALTIMORE HEATING, LLP - SPRING GARDENS | BALTIMORE, Baltimore (city), MD | Pass | State |
| 2025-12-10 | SAPPI NORTH AMERICA, INC. | SKOWHEGAN, Somerset, ME | Pass | State |
| 2025-12-10 | DETROIT THERMAL BEACON HEATING PLANT | DETROIT, Wayne, MI | Pass | State |
| 2025-12-10 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2025-12-10 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2025-12-10 | YPSILANTI COMMUNITY UTILITIES AUTHORITY | YPSILANTI, Washtenaw, MI | Pass | State |
| 2025-12-10 | YPSILANTI COMMUNITY UTILITIES AUTHORITY | YPSILANTI, Washtenaw, MI | Pass | State |
| 2025-12-10 | LOUISIANA-PACIFIC CORP NEWBERRY PLANT — high-priority violation on file | NEWBERRY, Luce, MI | Pass | State |
| 2025-12-10 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-10 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-10 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-10 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-10 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-10 | SOUTHWEST CLEAN WATER PLANT SPRINGFIELD | SPRINGFIELD, Greene, MO | Pass | State |
| 2025-12-10 | THE BOEING COMPANY | SAINT LOUIS COUNTY, St. Louis, MO | Pass | State |
| 2025-12-10 | THE BOEING COMPANY | SAINT LOUIS COUNTY, St. Louis, MO | Pass | State |
| 2025-12-10 | NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, JOHN C STENNIS SPACE CENTER | STENNIS SPAC, Hancock, MS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.