EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-05-20 | CAPITAL MATERIALS | OZARK, Christian, MO | Pass | State |
| 2026-05-20 | CAPITAL MATERIALS | OZARK, Christian, MO | Pass | State |
| 2026-05-20 | CITY OF HIGH POINT - WESTSIDE WASTEWATER TREATMENT PLANT | THOMASVILLE, Davidson, NC | Pending | State |
| 2026-05-20 | WEYERHAEUSER NR COMPANY - ELKIN FACILITY | ELKIN, Surry, NC | Pending | State |
| 2026-05-20 | CIE NORFOLK GNS LLC — high-priority violation on file | NORFOLK, Madison, NE | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | EQUITRANS MIDSTREAM COBRA COMPRESSOR STATION | SMITH, TOWNSHIP OF, Belmont, OH | Pass | State |
| 2026-05-20 | ASCENT RESOURCES - UTICA LLC - ATHENA SMF JF | SMITHFIELD, Jefferson, OH | Pass | State |
| 2026-05-20 | ASCENT RESOURCES - UTICA LLC - ATHENA SMF JF | SMITHFIELD, Jefferson, OH | Pass | State |
| 2026-05-20 | ASCENT RESOURCES - UTICA LLC - ATHENA SMF JF | SMITHFIELD, Jefferson, OH | Pass | State |
| 2026-05-20 | YORK CNTY SOLID WASTE/YORK CNTY RESOURCE RECOVERY — high-priority violation on file | YORK, York, PA | Pass | State |
| 2026-05-20 | M SIMON ZOOK CO DBA GOLDEN BARREL PROD/LEOLA | LEOLA, Lancaster, PA | Pass | State |
| 2026-05-20 | REGENCY MARCELLUS GAS GATHERING LLC/SEVERCOOL STA | FORKSTON, Wyoming, PA | Pass | State |
| 2026-05-20 | HAZLETON HILLER LLC/STOCKTON MOUNTAIN ROAD SITE — high-priority violation on file | HAZLETON, Luzerne, PA | Pending | State |
| 2026-05-20 | SNYDER BROS INC/ENSIGN COMPRESSOR STATION | FREEPORT, Armstrong, PA | Pass | State |
| 2026-05-20 | CNX MIDSTREAM OPR CO LLC/BUCKLAND COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2026-05-20 | EXPAND OPERATING LLC/NR02 ENDLESS MOUNTAIN WELLPAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-05-20 | NORTHEAST WPCP/PHILA — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pass | Local |
| 2026-05-20 | GUARDIAN INDUSTRIES LLC | RICHBURG, Chester, SC | Pass | State |
| 2026-05-20 | SANTEE COOPER WINYAH GENERATING STATION | GEORGETOWN, Georgetown, SC | Pass | State |
| 2026-05-20 | BASF METALS LLC | SENECA, Oconee, SC | Pass | State |
| 2026-05-20 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pending | State |
| 2026-05-20 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pending | State |
| 2026-05-20 | ECOSAFE SYSTEMS, LLC | BLOUNTVILLE, Sullivan, TN | Pass | State |
| 2026-05-20 | BIG WEST OIL | NORTH SALT LAKE, Davis, UT | Pass | State |
| 2026-05-20 | HF SINCLAIR WOODS CROSS REFINERY (FORMERLY HOLLY) | WOODS CROSS, Davis, UT | Pass | State |
| 2026-05-20 | WESTROCK CP LLC - WEST POINT | WEST POINT, King William, VA | Pass | State |
| 2026-05-20 | ANTERO MIDSTREAM LLC, BANNER COMPRESSOR STATION | NEW MILTON, Doddridge, WV | Pass | State |
| 2026-05-20 | DTM APPALACHIA GATHERING, LLC, MEPCO COMPRESSOR | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2026-05-20 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-05-20 | ROCK SPRINGS FERTILIZER COMPLEX (SIMPLOT PHOSPHATES) | ROCK SPRINGS, Sweetwater, WY | Pass | State |
| 2026-05-19 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-05-19 | COLORMASTERS INC | ALBERTVILLE, Marshall, AL | Pass | State |
| 2026-05-19 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-05-19 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | WADLEY, Randolph, AL | Pass | State |
| 2026-05-19 | GREEN BAY PACKAGING, INC. - ARKANSAS KRAFT DIVISION | MORRILTON, Conway, AR | Pass | State |
| 2026-05-19 | ARKANSAS LIME COMPANY | BATESVILLE, Independence, AR | Pass | State |
| 2026-05-19 | TESORO REFINING & MARKETING CO, LLC — high-priority violation on file | CARSON, Los Angeles, CA | Pass | Local |
| 2026-05-19 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-19 | ARCOSA LIGHTWEIGHT, FRAZIER PARK (1603) — high-priority violation on file | FRAZIER PARK, Ventura, CA | Pass | Local |
| 2026-05-19 | KINDER MORGAN LIQUIDS TERMINALS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-05-19 | NEXTERA ENERGY | ORLANDO, Orange, FL | Pass | State |
| 2026-05-19 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-05-19 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-05-19 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-19 | GA POWER CO. - PLANT BOWEN | CARTERSVILLE, Bartow, GA | Pass | State |
| 2026-05-19 | GA POWER CO. - PLANT SCHERER | JULIETTE, Monroe, GA | Pass | State |
| 2026-05-19 | SEWELL CREEK ENERGY FACILITY | CEDARTOWN, Polk, GA | Pass | State |
| 2026-05-19 | HEIDELBERG MATERIALS US CEMENT LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Fail | State |
| 2026-05-19 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-19 | BARKLEY ASPHALT INC | SIOUX CITY, Woodbury, IA | Pass | State |
| 2026-05-19 | ADVOCATE ILLINOIS MASONIC MEDICAL CENTER | CHICAGO, Cook, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | RIVERSTONE GROUP INC | LOWELL, La Salle, IL | Pass | State |
| 2026-05-19 | UNITED STATES GYPSUM COMPANY — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-05-19 | UNITED STATES GYPSUM COMPANY — high-priority violation on file | EAST CHICAGO, Lake, IN | Pass | State |
| 2026-05-19 | INGEVITY VIRGINIA CORP - WICKLIFFE CARBON PLANT | WICKLIFFE, Ballard, KY | Pass | State |
| 2026-05-19 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-19 | NOVELIS CORPORATION | GUTHRIE, Todd, KY | Pass | State |
| 2026-05-19 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2026-05-19 | GLOBAL CELLULOSE FIBERS - RIEGELWOOD MILL | RIEGELWOOD, Columbus, NC | Pending | State |
| 2026-05-19 | EGGER - LEXINGTON PARTICLEBOARD PLANT — high-priority violation on file | LINWOOD, Davidson, NC | Pass | State |
| 2026-05-19 | NC MUNICIPAL POWER AGENCY NO. 1 - HIGH POINT WATER PUMP STAT | HIGH POINT, Guilford, NC | Pass | State |
| 2026-05-19 | ISABELLA PEARL MINE | LUNING, Mineral, NV | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - CRAVAT WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - CRAVAT WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - CRAVAT WHL BL WELL PAD | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - TRUCHAN NW WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - TRUCHAN NW WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - TRUCHAN NW WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - MATUSEK WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - MATUSEK WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | ASCENT RESOURCES - UTICA LLC - MATUSEK WHL BL | SAINT CLAIRSVILLE, Belmont, OH | Pass | State |
| 2026-05-19 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-19 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-19 | EOG RESOURCES, INC. - E CLARK SOUTH CTB | TIPPECANOE, Harrison, OH | Pass | State |
| 2026-05-19 | ERAMET MARIETTA, INC. — high-priority violation on file | MARIETTA, Washington, OH | Pass | State |
| 2026-05-19 | ERAMET MARIETTA, INC. — high-priority violation on file | MARIETTA, Washington, OH | Pass | State |
| 2026-05-19 | ERAMET MARIETTA, INC. — high-priority violation on file | MARIETTA, Washington, OH | Pass | State |
| 2026-05-19 | ALTIVIA PETROCHEMICALS, LLC | HAVERHILL, Scioto, OH | Pass | State |
| 2026-05-19 | THE ANDERSONS RENEWABLES LLC - GREENVILLE PLANT — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2026-05-19 | THE ANDERSONS RENEWABLES LLC - GREENVILLE PLANT — high-priority violation on file | GREENVILLE, Darke, OH | Pass | State |
| 2026-05-19 | IRONROCK CAPITAL, INC. — high-priority violation on file | CANTON, Stark, OH | Pass | State |
| 2026-05-19 | IRONROCK CAPITAL, INC. — high-priority violation on file | CANTON, Stark, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.