EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,633Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,448
- Ohio 2,217
- New Mexico 1,801
- Indiana 1,621
- Florida 1,425
- Wyoming 1,362
- Georgia 1,234
- Oklahoma 1,229
- Pennsylvania 957
- Missouri 772
- Alabama 693
- Mississippi 689
- Arkansas 619
- Iowa 500
- Colorado 405
- Kansas 404
- Michigan 387
- Texas 308
- North Carolina 276
- Illinois 264
- Washington 263
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 207
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 157
- North Dakota 152
- Nebraska 145
- Maine 131
- Louisiana 129
- New York 126
- Arizona 116
- Idaho 111
- Nevada 75
- New Hampshire 59
- Massachusetts 59
- Hawaii 58
- Oregon 56
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- New Jersey 11
- Vermont 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | CHRISTIANA CARE HEALTH SERVICES - CHRISTIANA HOSPITAL | NEWARK, New Castle, DE | Pass | State |
| 2025-12-04 | LANGBOARD - WILLACOOCHEE — high-priority violation on file | WILLACOOCHEE, Atkinson, GA | Fail | State |
| 2025-12-04 | BUILDING MATERIALS MANUFACTURING LLC | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-04 | SOUTHERN LNG CO., LLC - ELBA ISLAND LNG TERMINAL - (KINDER MORGAN, INC.) — high-priority violation on file | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-04 | SOUTHERN LNG CO., LLC - ELBA ISLAND LNG TERMINAL - (KINDER MORGAN, INC.) — high-priority violation on file | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-04 | SOUTHERN LNG CO., LLC - ELBA ISLAND LNG TERMINAL - (KINDER MORGAN, INC.) — high-priority violation on file | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-04 | SOUTHERN LNG CO., LLC - ELBA ISLAND LNG TERMINAL - (KINDER MORGAN, INC.) — high-priority violation on file | SAVANNAH, Chatham, GA | Pass | State |
| 2025-12-04 | GA POWER CO. PLANT YATES | NEWNAN, Coweta, GA | Pass | State |
| 2025-12-04 | WASHINGTON COUNTY POWER, LLC | SANDERSVILLE, Washington, GA | Pass | State |
| 2025-12-04 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-12-04 | HOMELAND ENERGY SOLUTIONS LLC — high-priority violation on file | LAWLER, Chickasaw, IA | Pass | State |
| 2025-12-04 | SUPERIOR CONSTRUCTION AND EXCAVATING INC 00684 | MERIDIAN, Ada, ID | Pass | State |
| 2025-12-04 | NIKKEI MC ALUMINUM AMERICA INC | COLUMBUS, Bartholomew, IN | Pass | State |
| 2025-12-04 | US STEEL CORPORATION GARY WORKS — high-priority violation on file | GARY, Lake, IN | Pass | State |
| 2025-12-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-12-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-12-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-12-04 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2025-12-04 | LOUISVILLE GAS AND ELECTRIC COMPANY CANE RUN GENERATING STATION | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-12-04 | LOUISVILLE MEDICAL CENTER STEAM PLANT | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2025-12-04 | EASTON UTILITIES - WASHINGTON STREET | EASTON, Talbot, MD | Pass | State |
| 2025-12-04 | MICHIGAN SUGAR COMPANY, CROSWELL FACTORY — high-priority violation on file | CROSWELL, Sanilac, MI | Pass | State |
| 2025-12-04 | ARAUCO NORTH AMERICA | GRAYLING, Crawford, MI | Pass | State |
| 2025-12-04 | ABBOTT NORTHWESTERN HOSPITAL | MINNEAPOLIS, Hennepin, MN | Pass | State |
| 2025-12-04 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-04 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-04 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-04 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-04 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-04 | SUNSHINE MILLS INC — high-priority violation on file | TUPELO, Lee, MS | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | BILLINGS REFINERY | BILLINGS, Yellowstone, MT | Pass | State |
| 2025-12-04 | NC MUNICIPAL POWER AGENCY NO. 1 - HIGH POINT WATER PUMP STAT | HIGH POINT, Guilford, NC | Pass | State |
| 2025-12-04 | NC MUNICIPAL POWER AGENCY NO. 1 - HIGH POINT POLO PLANT | HIGH POINT, Guilford, NC | Pass | State |
| 2025-12-04 | RAMBO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-04 | CAMINO BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-04 | OVER THE LINE COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-12-04 | OVER THE LINE COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-12-04 | FREEPOINT ECO-SYSTEMS HEBRON | HEBRON, Licking, OH | Fail | State |
| 2025-12-04 | PLY GEM — high-priority violation on file | SIDNEY, Shelby, OH | Pass | State |
| 2025-12-04 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-12-04 | TAIT ELECTRIC GENERATING STATION | MORAINE, Montgomery, OH | Pass | State |
| 2025-12-04 | INTERNATIONAL PAPER | SPRINGFIELD, Lane, OR | Pass | Local |
| 2025-12-04 | GREATER HAZLETON JT SEW AUTH/WEST HAZLETON STP — high-priority violation on file | WEST HAZLETON, Luzerne, PA | Fail | State |
| 2025-12-04 | RAUSCH CREEK GENERATION LLC/FRAILEY TWP — high-priority violation on file | TREMONT, Schuylkill, PA | Pass | State |
| 2025-12-04 | GEORGIA-PACIFIC WOOD PRODUCTS LLC - PROSPERITY PLYWOOD PLANT | PROSPERITY, Newberry, SC | Pass | State |
| 2025-12-04 | MITCHELL REGIONAL LANDFILL | MITCHELL, Davison, SD | Pass | State |
| 2025-12-04 | SCOTT SOLID WASTE DISPOSAL COMPANY | ONEIDA, Scott, TN | Pass | State |
| 2025-12-04 | PACIFICORP HUNTER | UTAH, Undetermined, UT | Pass | State |
| 2025-12-04 | WALMART SUPERCENTER #5880 | FAIRFAX, Fairfax (city), VA | Fail | State |
| 2025-12-04 | D&L FOUNDRY & SUPPLY INC | MOSES LAKE, Grant, WA | Pass | State |
| 2025-12-04 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-12-04 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-12-04 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-04 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-12-03 | STEEL DUST RECYCLING LLC | MILLPORT, Lamar, AL | Pass | State |
| 2025-12-03 | STEEL DUST RECYCLING LLC | MILLPORT, Lamar, AL | Pass | State |
| 2025-12-03 | MURPHY OIL USA | MONTGOMERY, Montgomery, AL | Pass | State |
| 2025-12-03 | GEORGIA-PACIFIC WOOD PRODUCTS LLC | GURDON, Clark, AR | Pass | State |
| 2025-12-03 | GEORGIA-PACIFIC WOOD PRODUCTS LLC | GURDON, Clark, AR | Pass | State |
| 2025-12-03 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-3 | SPRINGFIELD, Conway, AR | Pass | State |
| 2025-12-03 | NUCOR COATINGS CORPORATION - BLYTHEVILLE PLANT | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2025-12-03 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2025-12-03 | MOSS LANDING POWER COMPANY LLC (FRMLY DYNEGY MOSS LANDING LLC) | MOSS LANDING, Monterey, CA | Pass | Local |
| 2025-12-03 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2025-12-03 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-03 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | Fail | State |
| 2025-12-03 | THE JACKSON LABORATORY FOR GENOMIC MEDICINE — high-priority violation on file | FARMINGTON, Hartford, CT | Pass | State |
| 2025-12-03 | ROHM & HAAS ELECTRONIC MATERIALS,CMP,INC | NEWARK, New Castle, DE | Pass | State |
| 2025-12-03 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2025-12-03 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | Pass | State |
| 2025-12-03 | CITY OF TALLAHASSEE | TALLAHASSEE, Leon, FL | 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.