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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.