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 |
|---|---|---|---|---|
| 2025-09-23 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
| 2025-09-23 | TOKAI CARBON GE LLC | HICKMAN, Fulton, KY | Pass | State |
| 2025-09-23 | DOMTAR PAPER CO LLC - HAWESVILLE OPERATIONS | HAWESVILLE, Hancock, KY | Pass | State |
| 2025-09-23 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2025-09-23 | TENNESSEE VALLEY AUTHORITY (TVA) - SHAWNEE FOSSIL PLANT | WEST PADUCAH, McCracken, KY | Pass | State |
| 2025-09-23 | VENTURE GLOBAL PLAQUEMINES LNG LLC - PLAQUEMINES LNG TERMINAL | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2025-09-23 | CITY OF BATH LANDFILL | BATH, Sagadahoc, ME | Pass | State |
| 2025-09-23 | WOODLAND PULP LLC — high-priority violation on file | BAILEYVILLE, TOWN OF, Washington, ME | Pass | State |
| 2025-09-23 | BILLERUD QUINNESEC LLC | QUINNESEC, Dickinson, MI | Pass | State |
| 2025-09-23 | NATIONAL ENERGY OF MCBAIN LLC | MCBAIN, Missaukee, MI | Pass | State |
| 2025-09-23 | WM MUELLER & SONS INC | HAMBURG, Carver, MN | Pass | State |
| 2025-09-23 | MINNESOTA SOYBEAN PROCESSORS | BREWSTER, Nobles, MN | Pass | State |
| 2025-09-23 | ABBOTT | LITTLE CANADA, Ramsey, MN | N/A | State |
| 2025-09-23 | HARBISON-WALKER INTERNATIONAL, INC.-FULTON ROTARY KILN — high-priority violation on file | FULTON, Callaway, MO | Fail | State |
| 2025-09-23 | CENTRAL STONE COMPANY MOSCOW MILLS QUARRY - CS57 | MOSCOW MILLS, Lincoln, MO | Pass | State |
| 2025-09-23 | CENTRAL STONE COMPANY MOSCOW MILLS QUARRY - CS57 | MOSCOW MILLS, Lincoln, MO | Pass | State |
| 2025-09-23 | CENTRAL STONE COMPANY MOSCOW MILLS QUARRY - CS57 | MOSCOW MILLS, Lincoln, MO | Pass | State |
| 2025-09-23 | CENTRAL STONE COMPANY MOSCOW MILLS QUARRY - CS57 | MOSCOW MILLS, Lincoln, MO | Pass | State |
| 2025-09-23 | CENTRAL STONE COMPANY MOSCOW MILLS QUARRY - CS57 | MOSCOW MILLS, Lincoln, MO | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | SHUQUALAK LUMBER COMPANY INC, PLANER MILL DIVISION — high-priority violation on file | SHUQUALAK, Noxubee, MS | Pass | State |
| 2025-09-23 | CHUCK'S CONSTRUCTION MINE | CALABASH, Brunswick, NC | Pass | State |
| 2025-09-23 | VETERANS AFFAIRS MEDICAL CENTER - FAYETTEVILLE | FAYETTEVILLE, Cumberland, NC | Pending | State |
| 2025-09-23 | BARNHILL CONTRACTING COMPANY - GREENVILLE PLANT | GREENVILLE, Pitt, NC | Pass | State |
| 2025-09-23 | TOYOTA BATTERY MFG. INC. DBA TOYOTA BATTERY MANUFACTURING NC | LIBERTY, Randolph, NC | Pass | State |
| 2025-09-23 | UNION PACIFIC RAILROAD — high-priority violation on file | NORTH PLATTE, Lincoln, NE | Pass | State |
| 2025-09-23 | MID AMERICA AGRI PRODUCTS | MADRID, Perkins, NE | N/A | State |
| 2025-09-23 | FIREBALL GROUP LLC DATA CENTER — high-priority violation on file | PAPILLION, Sarpy, NE | N/A | State |
| 2025-09-23 | DR. SCRIVNER FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-09-23 | RIVERBEND 11-14 CTB 1 | MALAGA, Eddy, NM | Pass | State |
| 2025-09-23 | RIVERBEND 11-14 CTB 1 | MALAGA, Eddy, NM | Pass | State |
| 2025-09-23 | FRAC CAT COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-09-23 | FRAC CAT COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-09-23 | LARIAT COMPRESSOR STATION — high-priority violation on file | MALJAMAR, Lea, NM | Pass | State |
| 2025-09-23 | LARIAT COMPRESSOR STATION — high-priority violation on file | MALJAMAR, Lea, NM | Pass | State |
| 2025-09-23 | HORNED FROG COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-23 | HORNED FROG COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-23 | TGP COMPRESSOR STATION 245 | WINFIELD, Herkimer, NY | Pass | State |
| 2025-09-23 | SANOH AMERICA, INC. | FINDLAY, Hancock, OH | Pass | State |
| 2025-09-23 | SANOH AMERICA, INC. | FINDLAY, Hancock, OH | Pass | State |
| 2025-09-23 | ASCENT RESOURCES - UTICA LLC - SIDWELL WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-23 | ASCENT RESOURCES - UTICA LLC - SIDWELL WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-23 | ASCENT RESOURCES - UTICA LLC - SIDWELL WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-23 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-23 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-23 | ASCENT RESOURCES - UTICA LLC - THREE DADS RCH BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2025-09-23 | INTL WAXES INC/FARMERS VALLEY | SMETHPORT, McKean, PA | Pass | State |
| 2025-09-23 | PECORA CORP/PECORA | HARLEYSVILLE, Montgomery, PA | Pass | State |
| 2025-09-23 | MARKWEST LIBERTY MIDSTREAM & RESOURCES/GODWIN COMP STA | WASHINGTON, Washington, PA | Pass | State |
| 2025-09-23 | APPALACHIA MIDSTREAM SVC LLC/RED FOX CDP | FOX, Sullivan, PA | Pass | State |
| 2025-09-23 | EXPAND OPERATING LLC/FERRARO WELL PAD | NEW ALBANY, Bradford, PA | Pass | State |
| 2025-09-23 | EXPAND OPERATING LLC/ RU-13 TONYA EAST PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-09-23 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2025-09-23 | PARR COMBUSTION TURBINE FACILITY | JENKINSVILLE, Fairfield, SC | Pass | State |
| 2025-09-23 | MOST, INC.- MISSOURI SMELTING TECHNOLOGY, INC. | JACKSON, Madison, TN | Pass | State |
| 2025-09-23 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-09-23 | PACIFICORP LAKESIDE (SUMMIT VINEYARD) | VINEYARD, Utah, UT | Pass | State |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-09-23 | CUMBERLAND MUNICIPAL UTILITY | CUMBERLAND, Barron, WI | Pass | State |
| 2025-09-23 | 3M PRAIRIE DU CHIEN BUILDING 50 | PRAIRIE DU CHIEN, Crawford, WI | Pass | State |
| 2025-09-23 | ROCKGEN ENERGY CENTER — high-priority violation on file | CAMBRIDGE, Dane, WI | Pass | State |
| 2025-09-23 | GRAYMONT WESTERN LIME - EDEN | EDEN, Fond du Lac, WI | Pass | State |
| 2025-09-23 | APPALACHIA MIDSTREAM SERVICES, L.L.C., THREEDUBS STATION | WELLSBURG, Brooke, WV | Pass | State |
| 2025-09-23 | EASTERN GAS TRANSMISSION AND STORAGE, INC., CORNWELL STATION | CLENDENIN, Kanawha, WV | Pass | State |
| 2025-09-23 | COLUMBIA GAS TRANSMISSION, LLC, SENECA | SENECA ROCKS, Pendleton, WV | Pass | State |
| 2025-09-23 | AOC MATERIALS, LLC, NEAL PLANT | KENOVA, Wayne, WV | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | STEAMBOAT PROCESSING FACILITY (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-23 | WESTVACO FACILITY (WE SODA WYOMING LP) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-22 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2025-09-22 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2025-09-22 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-22 | KERN OIL & REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.