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 |
|---|---|---|---|---|
| 2025-10-21 | SUNGEEL RECYCLING PARK INDIANA LLC | WHITESTOWN, Boone, IN | Pass | State |
| 2025-10-21 | SUNGEEL RECYCLING PARK INDIANA LLC | WHITESTOWN, Boone, IN | Pass | State |
| 2025-10-21 | SUNGEEL RECYCLING PARK INDIANA LLC | WHITESTOWN, Boone, IN | Pass | State |
| 2025-10-21 | USMPC BUYER INC DBA ISOLATEK INTERNATIONAL | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-10-21 | USMPC BUYER INC DBA ISOLATEK INTERNATIONAL | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-10-21 | USMPC BUYER INC DBA ISOLATEK INTERNATIONAL | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-10-21 | USMPC BUYER INC DBA ISOLATEK INTERNATIONAL | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-10-21 | USMPC BUYER INC DBA ISOLATEK INTERNATIONAL | HUNTINGTON, Huntington, IN | Pass | State |
| 2025-10-21 | MID-AMERICA PIPELINE - MCLOUTH PUMP STATION | MCLOUTH STATION, Jefferson, KS | Pass | State |
| 2025-10-21 | BELLEVILLE MUN. POWER PLANT (AIR) | BELLEVILLE, Republic, KS | Pass | State |
| 2025-10-21 | GLASGOW REGIONAL LANDFILL | GLASGOW, Barren, KY | Pass | State |
| 2025-10-21 | STELLA-JONES CORP | FULTON, Fulton, KY | Pending | State |
| 2025-10-21 | LOUISVILLE GAS & ELECTRIC CO - TRIMBLE CO GENERATING STATION | BEDFORD, Trimble, KY | Pass | State |
| 2025-10-21 | MILLERSVILLE LANDFILL | SEVERN, Anne Arundel, MD | Pass | State |
| 2025-10-21 | DOMINION TRANSMISSION, INC | MIDDLETOWN, Frederick, MD | Pass | State |
| 2025-10-21 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-10-21 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-21 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-21 | MISSISSIPPI POWER COMPANY, CHEVRON COGENERATING PLANT | PASCAGOULA, Jackson, MS | Pass | State |
| 2025-10-21 | ROXUL USA INC | BYHALIA, Marshall, MS | Pass | State |
| 2025-10-21 | ROXUL USA INC | BYHALIA, Marshall, MS | Pass | State |
| 2025-10-21 | ROXUL USA INC | BYHALIA, Marshall, MS | Pass | State |
| 2025-10-21 | USG INTERIORS LLC | GREENVILLE, Washington, MS | Pass | State |
| 2025-10-21 | REGULATOR MARINE, INC. | EDENTON, Chowan, NC | Pending | State |
| 2025-10-21 | BRONCO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | BRONCO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | WALKER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | WALKER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | WALKER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | TOUGH OMBRES 4 5 BATTERY | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-21 | RANA SALADA PAD L | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | CASA BONITA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | CASA BONITA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-21 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-21 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-10-21 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-10-21 | PAN MINE PROJECT | EUREKA, White Pine, NV | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | DAVID STALDER PAD 952419 | SARDIS, Monroe, OH | Pass | State |
| 2025-10-21 | TEXAS EASTERN TRANS LP/LILLY STA | LILLY, Cambria, PA | Pass | State |
| 2025-10-21 | CNX MIDSTREAM OPR CO LLC/BUCKLAND COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2025-10-21 | EXPAND OPERATING LLC/WOOSMAN PAD | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-10-21 | FLOWER, T. PAD 1 | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-10-21 | WOOD, E. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-21 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Pass | State |
| 2025-10-21 | CITY OF RAPID CITY SOLID WASTE DIVISION | RAPID CITY, Pennington, SD | Pass | State |
| 2025-10-21 | NISSAN NORTH AMERICA, INC.- SMYRNA | SMYRNA, Rutherford, TN | Pass | State |
| 2025-10-21 | MURRAY CITY POWER DEPARTMENT | MURRAY, Salt Lake, UT | Pass | State |
| 2025-10-21 | AMAZON DATA SERVICES - DCA-51 | WARRENTON, Fauquier, VA | Fail | State |
| 2025-10-21 | SIERRA PACIFIC IND.- SKAGIT LUMBER | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-10-21 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-21 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
| 2025-10-21 | UW MADISON CHARTER STREET HEATING PLANT (DOA) | MADISON, Dane, WI | Pass | State |
| 2025-10-21 | GREDE LLC - LIBERTY — high-priority violation on file | WAUWATOSA, Monroe, WI | Pass | State |
| 2025-10-21 | DELRIN USA, LLC, DELRIN USA - WASHINGTON WORKS | WASHINGTON, Wood, WV | Pass | State |
| 2025-10-20 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-20 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-20 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2025-10-20 | GULF SOUTH PIPELINE COMPANY, LP | MOBILE, Mobile, AL | Pass | State |
| 2025-10-20 | GULF SOUTH PIPELINE COMPANY, LP | MOBILE, Mobile, AL | Pass | State |
| 2025-10-20 | ENABLE MISSISSIPPI RIVER TRANSMISSION, LLC - FOUNTAIN HILL COMPRESSOR STATION | HAMBURG, Ashley, AR | Pass | State |
| 2025-10-20 | DESOTO GATHERING COMPANY, LLC - NORTHWEST CHARLEY CPF-2 | GREERS FERRY, Cleburne, AR | Pass | State |
| 2025-10-20 | DESOTO GATHERING COMPANY, LLC - MAKO CPF-1 | PANGBURN, White, AR | Pass | State |
| 2025-10-20 | PHILLIPS 66 COMPANY/LA REFINERY | CARSON, Los Angeles, CA | Pass | Local |
| 2025-10-20 | OLS ENERGY CHINO | CHINO, San Bernardino, CA | Pass | Local |
| 2025-10-20 | OLS ENERGY CHINO | CHINO, San Bernardino, CA | Pass | Local |
| 2025-10-20 | DCP OPERATING CO - LIBSACK C.S. | GREELEY AREA, Weld, CO | N/A | State |
| 2025-10-20 | PRATT & WHITNEY, DIVISION OF RTX CORPORATION | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2025-10-20 | WASTE MANAGEMENT INC. OF FLORIDA | NAPLES, Collier, FL | Pass | State |
| 2025-10-20 | WASTE MANAGEMENT INC. OF FLORIDA | NAPLES, Collier, FL | Pass | State |
| 2025-10-20 | WASTE MANAGEMENT INC. OF FLORIDA | NAPLES, Collier, FL | Pass | State |
| 2025-10-20 | CRISP COUNTY POWER COMMISSION | WARWICK, Worth, GA | Pass | State |
| 2025-10-20 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-20 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2025-10-20 | NORTH VERNON INDUSTRY CORPORATION | NORTH VERNON, Jennings, IN | Pass | State |
| 2025-10-20 | AMSTED RAIL (AIR) | KANSAS CITY, Wyandotte, KS | Pass | State |
| 2025-10-20 | CENTURY ALUMINUM SEBREE LLC | ROBARDS, Henderson, KY | Pass | State |
| 2025-10-20 | MASON CO KY FISCAL COURT | MAYSVILLE, Mason, KY | Pass | State |
| 2025-10-20 | JBS WORTHINGTON MN | WORTHINGTON, Nobles, MN | Pass | State |
| 2025-10-20 | WALKER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-20 | RANA SALADA E PAD | LOVING, Eddy, NM | Pass | State |
| 2025-10-20 | CASA BONITA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-20 | CASA BONITA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-20 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-20 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-20 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-10-20 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-10-20 | HOOSIER MAGNETICS INC | OGDENSBURG, St. Lawrence, NY | Pass | State |
| 2025-10-20 | SUMMIT COUNTY ENGINEER NORTH STATION — high-priority violation on file | PENINSULA, Summit, OH | Pass | State |
| 2025-10-20 | ENABLE GAS TRANSMISSION LLC / CUSTER COMPRESSOR STATION | ARAPAHO, Custer, OK | Pass | State |
| 2025-10-20 | EQT ARO LLC/VARGO COMP STA — high-priority violation on file | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-10-20 | CABOT OIL & GAS CORP/TEDDICK, M. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-10-20 | CABOT OIL & GAS CORP/JEFFERS FARMS PAD 5 | GIBSON, Susquehanna, PA | Pass | State |
| 2025-10-20 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | N/A | State |
| 2025-10-20 | BEAUMONT GAS TO GASOLINE PLANT — high-priority violation on file | BEAUMONT, Jefferson, TX | N/A | State |
| 2025-10-20 | PUGET SOUND ENERGY (WA NATURAL GAS) | CHEHALIS, Lewis, WA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.