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 |
|---|---|---|---|---|
| 2025-10-02 | HOLLY ENERGY - DENVER PRODUCTS TERMINAL | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-10-02 | HOLLY ENERGY - DENVER PRODUCTS TERMINAL | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-10-02 | HOLLY ENERGY - DENVER PRODUCTS TERMINAL | COMMERCE CITY AREA, Adams, CO | Pass | State |
| 2025-10-02 | PAWNEE WASTE - PAWNEE WASTE E&P LANDFILL | GROVER 3.8 MI. SE OF, Weld, CO | Pass | State |
| 2025-10-02 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Fail | State |
| 2025-10-02 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-10-02 | FLORIDA GAS TRANSMISSION COMPANY | ORLANDO, Orange, FL | Pass | State |
| 2025-10-02 | FLORIDA GAS TRANSMISSION COMPANY | ORLANDO, Orange, FL | Pass | State |
| 2025-10-02 | VULCAN CONSTRUCTION MATERIALS, LLC - LITHIA SPRINGS QUARRY | LITHIA SPRINGS, Douglas, GA | Pass | State |
| 2025-10-02 | TROJAN BATTERY COMPANY, LLC | SANDERSVILLE, Washington, GA | Pass | State |
| 2025-10-02 | TROJAN BATTERY COMPANY, LLC | SANDERSVILLE, Washington, GA | Pass | State |
| 2025-10-02 | OSAGE MUNICIPAL UTILITIES | OSAGE, Mitchell, IA | Pass | State |
| 2025-10-02 | OSAGE MUNICIPAL UTILITIES | OSAGE, Mitchell, IA | Pass | State |
| 2025-10-02 | LAKE MILLS MUNICIPAL UTILITIES | LAKE MILLS, Winnebago, IA | Pass | State |
| 2025-10-02 | LAKE MILLS MUNICIPAL UTILITIES | LAKE MILLS, Winnebago, IA | Pass | State |
| 2025-10-02 | LAKE MILLS MUNICIPAL UTILITIES | LAKE MILLS, Winnebago, IA | Pass | State |
| 2025-10-02 | GRAIN CRAFT | BLACKFOOT, Bingham, ID | Pass | State |
| 2025-10-02 | SUNCORE CONSTRUCTION & MATERIALS INC 00572 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2025-10-02 | CONSOLIDATED GRAIN AND BARGE COMPANY | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2025-10-02 | ESSEX SOLUTIONS USA LLC | FRANKLIN, Johnson, IN | Pass | State |
| 2025-10-02 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-02 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-02 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-02 | CONSOLIDATED GRAIN & BARGE COMPANY INC — high-priority violation on file | MOUNT VERNON, Posey, IN | Pass | State |
| 2025-10-02 | JOHNS MANVILLE INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-02 | JOHNS MANVILLE INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-02 | JOHNS MANVILLE INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-02 | JOHNS MANVILLE INCORPORATED | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-02 | EVERGY - LAWRENCE (AIR) | LAWRENCE, Douglas, KS | Pass | State |
| 2025-10-02 | SUMNER-COWLEY ELECTRIC CO-OP - MILLER SUBSTATION | MILLER SUBSTATION, Sumner, KS | Pass | State |
| 2025-10-02 | DOMTAR PAPER CO LLC - HAWESVILLE OPERATIONS | HAWESVILLE, Hancock, KY | Pass | State |
| 2025-10-02 | J.R. VINAGRO CORPORATION | GREENVILLE, Piscataquis, ME | Pass | State |
| 2025-10-02 | J.R. VINAGRO COROPORATION | GREENVILLE, Piscataquis, ME | Pass | State |
| 2025-10-02 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2025-10-02 | DTE GAS COMPANY - BELLE RIVER MILLS COMPRESSOR STATION | CHINA, St. Clair, MI | Pass | State |
| 2025-10-02 | LACKS INDUSTRIES INC — high-priority violation on file | GRAND RAPIDS, Kent, MI | Pass | State |
| 2025-10-02 | UPPER MICHIGAN ENERGY RESOURCES -F.D. KUESTER G.S. | NEGAUNEE, Marquette, MI | Pass | State |
| 2025-10-02 | ONSLOW GRADING & PAVING, INC. | HUBERT, Onslow, NC | Pass | State |
| 2025-10-02 | MERCK SHARP & DOHME LLC | WILSON, Wilson, NC | Pass | State |
| 2025-10-02 | INGREDION, INC. — high-priority violation on file | WINSTON-SALEM, Forsyth, NC | Pass | Local |
| 2025-10-02 | INGREDION, INC. — high-priority violation on file | WINSTON-SALEM, Forsyth, NC | Pass | Local |
| 2025-10-02 | MAVERICK COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-02 | MIYAMURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-02 | TOMAHAWK 30 B CTB | MALAGA, Eddy, NM | Pass | State |
| 2025-10-02 | TOMAHAWK 30 B CTB | MALAGA, Eddy, NM | Pass | State |
| 2025-10-02 | TOMAHAWK 30 B CTB | MALAGA, Eddy, NM | Pass | State |
| 2025-10-02 | MERCHANT COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2025-10-02 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-10-02 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-10-02 | GUARDIAN INDUSTRIES CORP | GENEVA, Ontario, NY | Pass | State |
| 2025-10-02 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Fail | State |
| 2025-10-02 | INDUSTRIAL CONTAINER SERVICES, LLC — high-priority violation on file | GAHANNA, Franklin, OH | Fail | State |
| 2025-10-02 | ROBERT P. MONE PLANT | CONVOY, Van Wert, OH | Pass | State |
| 2025-10-02 | ROBERT P. MONE PLANT | CONVOY, Van Wert, OH | Pass | State |
| 2025-10-02 | WOEBER MUSTARD MFG. CO. | SPRINGFIELD, Clark, OH | Pass | State |
| 2025-10-02 | WOEBER MUSTARD MFG. CO. | SPRINGFIELD, Clark, OH | Pass | State |
| 2025-10-02 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-02 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-02 | FAIRBORN CEMENT COMPANY LLC | XENIA, Greene, OH | Pass | State |
| 2025-10-02 | BUCKEYE TERMINALS LLC CINCINNATI TERMINAL | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-10-02 | PA GEN ENERGY CO LLC/COP TRACT 293 COMP STA | WATERVILLE, Lycoming, PA | Pass | State |
| 2025-10-02 | AUSTIN, E. PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-10-02 | COOLEY, INC. | PAWTUCKET, Providence, RI | Pass | State |
| 2025-10-02 | NPPC KING WILLIAM — high-priority violation on file | KING WILLIAM, King William, VA | Fail | State |
| 2025-10-02 | EQUINIX, LLC - ASHBURN | ASHBURN, Loudoun, VA | Pass | State |
| 2025-10-02 | CALPINE MID-ATLANTIC GENERATION LLC - BAYVIEW | BAYVIEW, Northampton, VA | Pass | State |
| 2025-10-02 | KINDER MORGAN SOUTHEAST TERMINALS LLC - RICHMOND 1 | RICHMOND, Richmond (city), VA | Pass | State |
| 2025-10-02 | GLOBALFOUNDRIES US 2 LLC | ESSEX, Chittenden, VT | Pass | State |
| 2025-10-02 | NEENAH FOUNDRY COMPANY - DE PERE OPERATIONS | DE PERE, Brown, WI | Pass | State |
| 2025-10-01 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-10-01 | SOUTHERN NATURAL GAS | ELMORE, Elmore, AL | Pass | State |
| 2025-10-01 | SOUTHERN NATURAL GAS | ELMORE, Elmore, AL | Pass | State |
| 2025-10-01 | SOUTHERN NATURAL GAS | ELMORE, Elmore, AL | Pass | State |
| 2025-10-01 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | SWEET WATER, Marengo, AL | Pass | State |
| 2025-10-01 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | SWEET WATER, Marengo, AL | Pass | State |
| 2025-10-01 | POWERSOUTH ENERGY COOPERATIVE INC | MCINTOSH, Washington, AL | Pass | State |
| 2025-10-01 | POWERSOUTH ENERGY COOPERATIVE INC | MCINTOSH, Washington, AL | Pass | State |
| 2025-10-01 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-10-01 | UTAH GAS - DRAGON TRAIL 1121 | RANGELY 17.1 MI. S OF, Rio Blanco, CO | Pass | State |
| 2025-10-01 | AHLSTROM NONWOVENS, LLC | WINDSOR LOCKS, Hartford, CT | Pass | State |
| 2025-10-01 | REWORLD CONNECTICUT COMPANY — high-priority violation on file | PRESTON, New London, CT | Pass | State |
| 2025-10-01 | FLORIDA GAS TRANSMISSION COMPANY, LLC | LECANTO, Citrus, FL | Pass | State |
| 2025-10-01 | FLORIDA GAS TRANSMISSION COMPANY, LLC | LECANTO, Citrus, FL | Pass | State |
| 2025-10-01 | HILLSBOROUGH CTY. RESOURCE RECOVERY FAC. | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-01 | TROJAN BATTERY COMPANY, LLC | SANDERSVILLE, Washington, GA | Pass | State |
| 2025-10-01 | WESTERN DUBUQUE BIODIESEL LLC | FARLEY, Dubuque, IA | Pass | State |
| 2025-10-01 | OSAGE MUNICIPAL UTILITIES | OSAGE, Mitchell, IA | Pass | State |
| 2025-10-01 | OSAGE MUNICIPAL UTILITIES | OSAGE, Mitchell, IA | Pass | State |
| 2025-10-01 | ITAFOS CONDA LLC - TV FACILITY | SODA SPRINGS, Caribou, ID | Pass | State |
| 2025-10-01 | JM SMUCKER LLC | SCOTTSVILLE, Allen, KY | Pass | State |
| 2025-10-01 | BLUEGRASS INGREDIENTS, INC | SPRINGFIELD, Washington, KY | Pass | State |
| 2025-10-01 | LAKE WASHINGTON CENTRAL PRODUCTION PLATFORM | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2025-10-01 | CONSTELLATION WEST MEDWAY LLC | MEDWAY, Norfolk, MA | Pass | State |
| 2025-10-01 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2025-10-01 | MET COUNCIL - SENECA WWTP | EAGAN, Dakota, MN | Pass | State |
| 2025-10-01 | ST. JOSEPH WATER PROTECTION FACILITY | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-10-01 | INGREDION, INC. — high-priority violation on file | WINSTON-SALEM, Forsyth, NC | Pass | Local |
| 2025-10-01 | DOGTOWN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-01 | ARAPAHOE PARK COMPRESSOR STATION | WHITES CITY, Eddy, NM | Fail | State |
| 2025-10-01 | CABO WABO COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.