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 |
|---|---|---|---|---|
| 2025-10-16 | AMERICAN SUGAR REFINING INC | YONKERS, Westchester, NY | Pass | State |
| 2025-10-16 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-10-16 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-10-16 | ASCENT RESOURCES-UTICA LLC -CRAVAT COAL SHC HR WELL PAD | CADIZ, Harrison, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - EXTREME PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - EXTREME PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - EXTREME PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - LIMESTONE PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | GULFPORT APPALACHIA, LLC - KINYO PAD | RAYLAND, Jefferson, OH | Pass | State |
| 2025-10-16 | MCINTIRE NORTH PAD 952640 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-16 | MCINTIRE NORTH PAD 952640 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-16 | MCINTIRE NORTH PAD 952640 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-16 | MID-KAM CRUSHING LLC | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-10-16 | PROCTER & GAMBLE PAPER PROD CO/MEHOOPANY | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-10-16 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2025-10-16 | WHITE PINES CORP/WHITE PINES LDFL | MILLVILLE, Columbia, PA | Pass | State |
| 2025-10-16 | SUSQUEHANNA GATHERING/CDP 1 COMP STA | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-10-16 | DIVERSIFIED PROD LLC/NINEVEH 58 WELL PAD — high-priority violation on file | PROSPERITY, Washington, PA | Pass | State |
| 2025-10-16 | HALLIDAY, A. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-16 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-16 | SIERRA PACIFIC IND.- SKAGIT LUMBER | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-10-16 | THE PROCTER AND GAMBLE MANUFACTURING COMPANY, TABLER STATION | INWOOD, Berkeley, WV | Pass | State |
| 2025-10-16 | COLUMBIA GAS TRANSMISSION, LLC, LOST RIVER | MATHIAS, Hardy, WV | Pass | State |
| 2025-10-16 | COLUMBIA GAS TRANSMISSION, LLC, HUBBALL | BRANCHLAND, Lincoln, WV | Pass | State |
| 2025-10-16 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-10-16 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
| 2025-10-15 | CEMEX SOUTHEAST LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-10-15 | CEMEX SOUTHEAST LLC | DEMOPOLIS, Marengo, AL | Pass | State |
| 2025-10-15 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2025-10-15 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2025-10-15 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-15 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-15 | DESOTO GATHERING COMPANY, LLC - S. BROWNIE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2025-10-15 | DESOTO GATHERING COMPANY, LLC - S. BROWNIE CPF-1 | HATTIEVILLE, Conway, AR | Pass | State |
| 2025-10-15 | BIG RIVER STEEL LLC | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-10-15 | BIG RIVER STEEL LLC | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-10-15 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Fail | State |
| 2025-10-15 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-10-15 | REAL ALLOY ARIZONA | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-15 | IMPERIAL IRRIGATION DISTRICT/COACHELLA | COACHELLA, Riverside, CA | Pass | Local |
| 2025-10-15 | REWORLD BRISTOL, INC. | BRISTOL, Hartford, CT | Pass | State |
| 2025-10-15 | WATERBURY GENERATION, LLC | WATERBURY, New Haven, CT | Pass | State |
| 2025-10-15 | ALGONQUIN GAS TRANSMISSION, LLC - CHAPLIN COMPRESSOR STATION | CHAPLIN, Windham, CT | Pass | State |
| 2025-10-15 | DUKE ENERGY FLORIDA, LLC | CRYSTAL RIVER, Citrus, FL | Pass | State |
| 2025-10-15 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2025-10-15 | MIAMI-DADE WATER AND SEWER DEPARTMENT | HIALEAH, Miami-Dade, FL | Pass | State |
| 2025-10-15 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-15 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2025-10-15 | WESTROCK CP, LLC | FERNANDINA BEACH, Nassau, FL | Pass | State |
| 2025-10-15 | GEORGIA-PACIFIC PALATKA LLC — high-priority violation on file | PALATKA, Putnam, FL | Fail | State |
| 2025-10-15 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-10-15 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-10-15 | SOUTHWIRE COMPANY - CARROLLTON | CARROLLTON, Carroll, GA | Pass | State |
| 2025-10-15 | SOUTHWIRE COMPANY - CARROLLTON | CARROLLTON, Carroll, GA | Pass | State |
| 2025-10-15 | CHATTAHOOCHEE ENERGY FACILITY | FRANKLIN, Heard, GA | Pass | State |
| 2025-10-15 | CHATTAHOOCHEE ENERGY FACILITY | FRANKLIN, Heard, GA | Pass | State |
| 2025-10-15 | ARCHER DANIELS MIDLAND COMPANY (ADM) — high-priority violation on file | VALDOSTA, Lowndes, GA | Pass | State |
| 2025-10-15 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2025-10-15 | VALERO RENEWABLE FUELS CO LLC-HARTLEY — high-priority violation on file | HARTLEY, O'Brien, IA | Pass | State |
| 2025-10-15 | NORTH IDAHO ENERGY LOGS - MOYIE | MOYIE SPRINGS, Boundary, ID | Pass | State |
| 2025-10-15 | DUKE ENERGY INDIANA LLC - GIBSON GENERATING STATION | OWENSVILLE, Gibson, IN | Pass | State |
| 2025-10-15 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-15 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-15 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-15 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-15 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-15 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-15 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-15 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-15 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-15 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-15 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-15 | EVERGY, INC. - JEFFREY ENERGY CENTER (AIR) | ST. MARY'S, Pottawatomie, KS | Pass | State |
| 2025-10-15 | EXXONMOBIL ADVANCED GRAPHITE SOLUTIONS LLC | HOPKINSVILLE, Christian, KY | Pass | State |
| 2025-10-15 | ND PAPER INC. | RUMFORD, Oxford, ME | Pending | State |
| 2025-10-15 | ST MARYS CEMENT U.S. LLC, CHARLEVOIX PLANT | CHARLEVOIX, Charlevoix, MI | Pass | State |
| 2025-10-15 | PHARMACIA & UPJOHN CO LLC, A SUBSIDIARY OF PFIZER | KALAMAZOO, Kalamazoo, MI | Pass | State |
| 2025-10-15 | THE ANDERSONS RENEWABLES LLC | ALBION, Calhoun, MI | Pass | State |
| 2025-10-15 | UNIVERSITY OF MICHIGAN | ANN ARBOR, Washtenaw, MI | Pass | State |
| 2025-10-15 | EAGLE VALLEY LANDFILL | LAKE ORION, Oakland, MI | Pass | State |
| 2025-10-15 | UNIVERSITY OF MISSOURI POWER PLANT | COLUMBIA, Boone, MO | N/A | State |
| 2025-10-15 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, BENNDALE PEAKING STATION — high-priority violation on file | BENNDALE, George, MS | Pass | State |
| 2025-10-15 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, BENNDALE PEAKING STATION — high-priority violation on file | BENNDALE, George, MS | Pass | State |
| 2025-10-15 | COOPERATIVE ENERGY, A MISSISSIPPI ELECTRIC COOPERATIVE, BENNDALE PEAKING STATION — high-priority violation on file | BENNDALE, George, MS | Pass | State |
| 2025-10-15 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2025-10-15 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2025-10-15 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2025-10-15 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2025-10-15 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.