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 |
|---|---|---|---|---|
| 2025-10-20 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-10-20 | WI PUBLIC SERVICE WESTON POWER PLANT | KRONENWETTER, Marathon, WI | Pass | State |
| 2025-10-19 | HILCORP ALASKA, LLC / MILNE POINT PRODUCTION FACILITY (MPU) | NORTH SLOPE BOROUGH, North Slope, AK | Fail | State |
| 2025-10-18 | YAMAHA MOTOR MANUFACTURING CORPORATION | NEWNAN, Coweta, GA | Pass | State |
| 2025-10-18 | KANSAS CITY SAUSAGE CO, LLC DBA COASTAL PROTEIN | GODWIN, Sampson, NC | Pending | State |
| 2025-10-17 | QG PRINTING CORP — high-priority violation on file | RIVERSIDE, Riverside, CA | Pass | Local |
| 2025-10-17 | COLORADO SPRINGS UTILITIES - NIXON PLT | FOUNTAIN AREA, El Paso, CO | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-17 | GINGER WEST DATA CENTER | CITY OF WEST DES MOINES, Dallas, IA | Pass | State |
| 2025-10-17 | GINGER WEST DATA CENTER | CITY OF WEST DES MOINES, Dallas, IA | Pass | State |
| 2025-10-17 | SUL4R-PLUS LLC | MARISSA, St. Clair, IL | Pass | State |
| 2025-10-17 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-17 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-17 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-17 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-17 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-17 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-17 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-17 | EVERGY, INC. - JEFFREY ENERGY CENTER (AIR) | ST. MARY'S, Pottawatomie, KS | Pass | State |
| 2025-10-17 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-10-17 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-10-17 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-10-17 | TWIN RIVERS TECHNOLOGIES MANUFACTURING C | QUINCY, CITY OF, Norfolk, MA | Pending | State |
| 2025-10-17 | DEARBORN INDUSTRIAL GENERATION | DEARBORN, Wayne, MI | Pass | State |
| 2025-10-17 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-17 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-17 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-17 | KEYSTONE PORTLAND CEMENT/EAST ALLEN — high-priority violation on file | BATH, Northampton, PA | Pass | State |
| 2025-10-17 | BUCKEYE ENERGY SVC LLC/MACUNGIE TERMINAL | EMMAUS, Lehigh, PA | Pass | State |
| 2025-10-17 | REGENCY MARCELLUS GAS GATHERING LLC/POORMAN COMP STA | LOCK HAVEN, Clinton, PA | Pass | State |
| 2025-10-17 | REGENCY MARCELLUS GAS GATHERING LLC/POORMAN COMP STA | LOCK HAVEN, Clinton, PA | Pass | State |
| 2025-10-17 | DIVERSIFIED PROD LLC/NV 34 WELLPAD — high-priority violation on file | PROSPERITY, Washington, PA | Pass | State |
| 2025-10-17 | MCGHEE SCRAP CO/BEECH CREEK FAC | BEECH CREEK, Centre, PA | Pass | State |
| 2025-10-17 | SUMIRIKO TENNESSEE, INC. | TAZEWELL, Claiborne, TN | Pass | State |
| 2025-10-17 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-10-17 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-10-17 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-10-17 | GUAJILLO CENTRAL FACILITY | WHITSETT, Atascosa, TX | Pass | State |
| 2025-10-17 | AMAZON DATA SERVICES INC - IAD-165/166/167/168/613 | HERNDON, Fairfax, VA | Pass | State |
| 2025-10-17 | MICROSOFT CORPORATION - AVC43 DATACENTER | SOUTH HILL, Mecklenburg, VA | Pass | State |
| 2025-10-17 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-10-16 | DOYON UTILITIES, LLC / FORT WAINWRIGHT (PRIVATIZED EMISSION UN | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-16 | DOYON UTILITIES, LLC / FORT WAINWRIGHT (PRIVATIZED EMISSION UN | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-16 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2025-10-16 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW | CENTER RIDGE, Conway, AR | Pass | State |
| 2025-10-16 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW | CENTER RIDGE, Conway, AR | Pass | State |
| 2025-10-16 | IMPERIAL IRRIGATION DISTRICT/COACHELLA | COACHELLA, Riverside, CA | Pass | Local |
| 2025-10-16 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-10-16 | BIOCHAR NOW, LLC - BERTHOUD PLANT | BERTHOUD, Weld, CO | Pass | State |
| 2025-10-16 | SOUTH FLORIDA WATER MANAGEMENT DISTRICT | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2025-10-16 | DUKE ENERGY FLORIDA, LLC | CRYSTAL RIVER, Citrus, FL | Pass | State |
| 2025-10-16 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2025-10-16 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2025-10-16 | STERIGENICS U.S. LLC | ATLANTA, Cobb, GA | Pass | State |
| 2025-10-16 | ABSOLUTE ENERGY LLC-SAINT ANSGAR (MONA) | SAINT ANSGAR, Mitchell, IA | Pass | State |
| 2025-10-16 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2025-10-16 | WOOD'S CRUSHING & HAULING INC 00375 | SANDPOINT, Bonner, ID | Pass | State |
| 2025-10-16 | ILLINOIS CEMENT CO | LASALLE, La Salle, IL | Pass | State |
| 2025-10-16 | ILLINOIS CEMENT CO | LASALLE, La Salle, IL | Pass | State |
| 2025-10-16 | NIKKEI MC ALUMINUM AMERICA INC | COLUMBUS, Bartholomew, IN | Pass | State |
| 2025-10-16 | NIKKEI MC ALUMINUM AMERICA INC | COLUMBUS, Bartholomew, IN | Pass | State |
| 2025-10-16 | NIKKEI MC ALUMINUM AMERICA INC | COLUMBUS, Bartholomew, IN | Pass | State |
| 2025-10-16 | NIKKEI MC ALUMINUM AMERICA INC | COLUMBUS, Bartholomew, IN | Pass | State |
| 2025-10-16 | NIKKEI MC ALUMINUM AMERICA INC | COLUMBUS, Bartholomew, IN | Pass | State |
| 2025-10-16 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-16 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-16 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-16 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-16 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-16 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-16 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-16 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-16 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-16 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-16 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-16 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-16 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-10-16 | BLACKSTONE POWER GENERATING LLC | BLACKSTONE, Worcester, MA | Pending | State |
| 2025-10-16 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2025-10-16 | KNAUF INSULATION, INC. | ALBION, Calhoun, MI | Pass | State |
| 2025-10-16 | THE ANDERSONS RENEWABLES LLC | ALBION, Calhoun, MI | Pass | State |
| 2025-10-16 | UNITED STATES STEEL CORP - KEETAC | KEEWATIN, St. Louis, MN | Pass | State |
| 2025-10-16 | MARATHON SAINT PAUL PARK REFINERY | SAINT PAUL PARK, Washington, MN | N/A | State |
| 2025-10-16 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2025-10-16 | COLSTRIP STEAM ELECTRIC STATION | COLSTRIP, Rosebud, MT | Pass | State |
| 2025-10-16 | PCS PHOSPHATE COMPANY, INC. - AURORA | AURORA, Beaufort, NC | Pass | State |
| 2025-10-16 | FUTURE FOAM, INC. | HIGH POINT, Guilford, NC | Pending | State |
| 2025-10-16 | THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL | CHAPEL HILL, Orange, NC | Pass | State |
| 2025-10-16 | HILAND PARTNERS HOLDINGS LLC - EPPING COMPRESSOR STATION | EPPING, Williams, ND | N/A | State |
| 2025-10-16 | BAY MEADOWS COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-10-16 | ARAPAHOE PARK COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-10-16 | VICTORY COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-10-16 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.