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 |
|---|---|---|---|---|
| 2025-09-17 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-09-17 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-09-17 | TARGA BADLANDS JUNCTION COMPRESSOR STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-09-17 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-09-17 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-09-17 | BLUE BUTTES COMPRESSOR STATION AND PUMP STATION | MCKENZIE COUNTY, McKenzie, ND | Pass | U.S. EPA |
| 2025-09-17 | GOLDEN VALLEY ELECTRIC ASSOCIATION / ZEHNDER FACILITY | FAIRBANKS, Fairbanks North Star, AK | Fail | State |
| 2025-09-17 | GOLDEN VALLEY ELECTRIC ASSOCIATION / NORTH POLE POWER PLANT | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-09-17 | GOLDEN VALLEY ELECTRIC ASSOCIATION / NORTH POLE POWER PLANT | FAIRBANKS, Fairbanks North Star, AK | Fail | State |
| 2025-09-17 | GEORGIA PACIFIC | PENNINGTON, Choctaw, AL | Pass | State |
| 2025-09-17 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | BUCKEYE TERMINALS LLC | STOCKTON, San Joaquin, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | LAND O' LAKES, INC — high-priority violation on file | TULARE, Tulare, CA | Pass | Local |
| 2025-09-17 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-17 | BLACK HILLS ELECTRIC GENERATION - PAGS | PUEBLO, Pueblo, CO | Pass | State |
| 2025-09-17 | CONNECTICUT MUNICIPAL ELECTRIC ENERGY COOPERATIVE - BRIDGE STREET SITE — high-priority violation on file | GROTON, New London, CT | Pass | State |
| 2025-09-17 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-17 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-17 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-09-17 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2025-09-17 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2025-09-17 | LAKELAND ELECTRIC | LAKELAND, Polk, FL | Pass | State |
| 2025-09-17 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-17 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-17 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-17 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-17 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-17 | INTERNATIONAL PAPER COMPANY - PORT WENTWORTH MILL | PORT WENTWORTH, Chatham, GA | Pass | State |
| 2025-09-17 | TELEFLEX MEDICAL OEM LLC PKA IWG HPC INC. | TRENTON, Dade, GA | Pass | State |
| 2025-09-17 | GREEN POWER SOLUTIONS OF GEORGIA | DUBLIN, Laurens, GA | Pass | State |
| 2025-09-17 | GREEN POWER SOLUTIONS OF GEORGIA | DUBLIN, Laurens, GA | Pass | State |
| 2025-09-17 | SOWEGA POWER LLC | BACONTON, Mitchell, GA | Pass | State |
| 2025-09-17 | TRANE TECHNOLOGIES | VIDALIA, Toombs, GA | Pass | State |
| 2025-09-17 | PMX INDUSTRIES,INC. | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-17 | BWAY CORP | CHICAGO, Cook, IL | Pass | State |
| 2025-09-17 | DYNEGY MIDWEST GENERATION LLC | BALDWIN, Randolph, IL | Pass | State |
| 2025-09-17 | KY UTILITIES CO - GHENT STATION | GHENT, Carroll, KY | Pass | State |
| 2025-09-17 | TENNESSEE VALLEY AUTHORITY (TVA) - SHAWNEE FOSSIL PLANT | WEST PADUCAH, McCracken, KY | Pass | State |
| 2025-09-17 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2025-09-17 | TRUNKLINE GAS CO LLC - LONGVILLE COMPRESSOR STATION #48 | LONGVILLE, Beauregard, LA | Pass | State |
| 2025-09-17 | U S STEEL GREAT LAKES WORKS — high-priority violation on file | ECORSE, Wayne, MI | Pass | State |
| 2025-09-17 | INDECK NILES LLC | NILES, Cass, MI | Pass | State |
| 2025-09-17 | COURTNEY RIDGE LANDFILL, LLC | SUGAR CREEK, Jackson, MO | Fail | State |
| 2025-09-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | NUCOR STEEL SEDALIA LLC | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | NUCOR STEEL SEDALIA LLC | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | NUCOR STEEL SEDALIA LLC | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | NUCOR STEEL SEDALIA LLC | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | CENTRAL MISSOURI RENEWABLE NATURAL GAS LLC | SEDALIA, Pettis, MO | Pass | State |
| 2025-09-17 | MASONITE CORPORATION — high-priority violation on file | LAUREL, Jones, MS | Pass | State |
| 2025-09-17 | MASONITE CORPORATION — high-priority violation on file | LAUREL, Jones, MS | Pass | State |
| 2025-09-17 | MASONITE CORPORATION — high-priority violation on file | LAUREL, Jones, MS | Pass | State |
| 2025-09-17 | RPM INDUSTRIAL COATINGS GROUP, INC. | HUDSON, Caldwell, NC | Pending | State |
| 2025-09-17 | ONEOK ROCKIES MIDSTREAM, L.L.C. - ALEXANDER COMPRESSOR STATION | ALEXANDER, McKenzie, ND | Pass | State |
| 2025-09-17 | CARGILL INC — high-priority violation on file | BLAIR, Washington, NE | N/A | State |
| 2025-09-17 | AJ NONWOVENS-HAMPTON, LLC | HAMPTON, Rockingham, NH | Pass | State |
| 2025-09-17 | BURTON FLATS (KWBB) COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-09-17 | NARROWS GENERATING STATION | BROOKLYN (6102), Kings, NY | Pass | State |
| 2025-09-17 | FAB 8 | MALTA, Saratoga, NY | Pass | State |
| 2025-09-17 | CITY OF WILMINGTON LANDFILL | WILMINGTON, Clinton, OH | Pass | State |
| 2025-09-17 | ASCENT RESOURCES - UTICA LLC - NOLAN CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-09-17 | ASCENT RESOURCES - UTICA LLC - NOLAN CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-09-17 | ASCENT RESOURCES - UTICA LLC - NOLAN CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2025-09-17 | CITGO PETROLEUM - DAYTON TERMINAL | DAYTON, Montgomery, OH | Pass | State |
| 2025-09-17 | THE MEDICAL CENTER COMPANY | CLEVELAND, Cuyahoga, OH | Pass | State |
| 2025-09-17 | THE MEDICAL CENTER COMPANY | CLEVELAND, Cuyahoga, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.