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 |
|---|---|---|---|---|
| 2025-12-17 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2025-12-17 | NORTHERN NATURAL GAS CO - NORTH BRANCH | HARRIS, Chisago, MN | Pass | State |
| 2025-12-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-12-17 | CENTRAL MISSOURI SANITARY LANDFILL | SEDALIA, Pettis, MO | Pass | State |
| 2025-12-17 | CENTRAL MISSOURI RENEWABLE NATURAL GAS LLC | SEDALIA, Pettis, MO | Pass | State |
| 2025-12-17 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2025-12-17 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2025-12-17 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2025-12-17 | GEORGIA PACIFIC MONTICELLO LLC | MONTICELLO, Lawrence, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-17 | WEYERHAEUSER-EVERGREEN — high-priority violation on file | KALISPELL, Flathead, MT | Pass | State |
| 2025-12-17 | SUNROCK INDUSTRIES LLC - BUTNER ASPHALT | BUTNER, Granville, NC | Pass | State |
| 2025-12-17 | STERIGENICS US, INC. | CHARLOTTE, Mecklenburg, NC | Pass | Local |
| 2025-12-17 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2025-12-17 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-17 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-17 | RUSTLER BREAKS FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-12-17 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-17 | LONGWOOD - STEBBINS COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-17 | COBRA COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-12-17 | ISABELLA PEARL MINE | LUNING, Mineral, NV | Pass | State |
| 2025-12-17 | ISABELLA PEARL MINE | LUNING, Mineral, NV | Fail | State |
| 2025-12-17 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-17 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-17 | SAMUEL A CARLSON GENERATING STATION | JAMESTOWN, Chautauqua, NY | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GRYWALSKI MTP JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | ASCENT RESOURCES - UTICA LLC - GIUSTO CRC JF | STEUBENVILLE, Jefferson, OH | Pass | State |
| 2025-12-17 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-12-17 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-12-17 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-12-17 | WASTE MGMT DSPL SVC /GROWS LDFL | MORRISVILLE, Bucks, PA | Pass | State |
| 2025-12-17 | LANCASTER CNTY SWMA/SUSQ RESOURCE MGMT COMPLEX — high-priority violation on file | HARRISBURG, Dauphin, PA | Pending | State |
| 2025-12-17 | ETC NORTHEAST PIPELINE/REVOLUTION CRYO PLT | BULGER, Washington, PA | Pass | State |
| 2025-12-17 | DERRY TWP MUNI AUTH/CLEARWATER RD | HERSHEY, Dauphin, PA | Pass | State |
| 2025-12-17 | IKO MAT TECH INC - CHESTER FACILITY | CHESTER, Chester, SC | Pass | State |
| 2025-12-17 | SANTEE COOPER WINYAH GENERATING STATION | GEORGETOWN, Georgetown, SC | Pass | State |
| 2025-12-17 | AMRIZE CEMENT/FORMERLY HOLCIM (US), INC. — high-priority violation on file | MORGAN, Morgan, UT | Pass | State |
| 2025-12-17 | WAL-MART SUPERCENTER #4350 | KILMARNOCK, Lancaster, VA | Fail | State |
| 2025-12-17 | WAL-MART STORES EAST LP DBA WALMART SUPERCENTER #5105 | FRONT ROYAL, Warren, VA | Fail | State |
| 2025-12-17 | ADVANSIX RESINS AND CHEMICALS LLC - HOPEWELL PLANT — high-priority violation on file | HOPEWELL, Hopewell (city), VA | Pass | State |
| 2025-12-17 | SPSA - REGIONAL LANDFILL — high-priority violation on file | SUFFOLK, Suffolk (city), VA | Pass | State |
| 2025-12-16 | BUFFALO COMPRESSOR STATION | MANDAREE SEGMENT, Dunn, ND | Pass | U.S. EPA |
| 2025-12-16 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-12-16 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-12-16 | DESOTO GATHERING COMPANY, LLC - SOUTHWEST GREER LAKE CPF-5 | CLINTON, Van Buren, AR | Pass | State |
| 2025-12-16 | RAZORBACK GATHERING COMPANY, LLC. - LITTLE RED RIVER CPF 1 | BALD KNOB, White, AR | Pass | State |
| 2025-12-16 | ATLAS ASPHALT, INC. - POCAHONTAS | POCAHONTAS, White, AR | Pass | State |
| 2025-12-16 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-16 | COLORADO INTERSTATE GAS CO - GREASEWOOD | MEEKER 16.5 MI. SW OF, Rio Blanco, CO | Pass | State |
| 2025-12-16 | HIGHPOINT - ANSCHUTZ EQUUS FARMS 4-62-28 | ORCHARD 11.6 MI. N OF, Weld, CO | Pass | State |
| 2025-12-16 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-16 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-16 | GLOBAL COMPANIES LLC | FORT LAUDERDALE, Broward, FL | Pass | State |
| 2025-12-16 | TAMPA ELECTRIC COMPANY (TEC) | GIBSONTON, Hillsborough, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | OSCEOLA FARMS | PAHOKEE, Palm Beach, FL | Pass | State |
| 2025-12-16 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-16 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-16 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-16 | NORTHERN NATURAL GAS CO-OGDEN | OGDEN, Boone, IA | Pass | State |
| 2025-12-16 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Pass | State |
| 2025-12-16 | BIG RIVER UNITED ENERGY LLC-DYERSVILLE | DYERSVILLE, Dubuque, IA | Pass | State |
| 2025-12-16 | BIG RIVER UNITED ENERGY LLC-DYERSVILLE | DYERSVILLE, Dubuque, IA | Pass | State |
| 2025-12-16 | CERNE CALCIUM CARBONATE LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-12-16 | CERNE CALCIUM CARBONATE LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-12-16 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-12-16 | FOREST CITY MUNICIPAL LIGHT PLANT | FOREST CITY, Winnebago, IA | Pass | State |
| 2025-12-16 | CF INDUSTRIES NITROGEN LLC - PORT NEAL NITROGEN COMPLEX — high-priority violation on file | SERGEANT BLUFF, Woodbury, IA | Fail | State |
| 2025-12-16 | GRAND VICTORIA CASINO | ELGIN, Kane, IL | Pass | State |
| 2025-12-16 | GRAND VICTORIA CASINO | ELGIN, Kane, IL | Pass | State |
| 2025-12-16 | GRAND VICTORIA CASINO | ELGIN, Kane, IL | Pass | State |
| 2025-12-16 | ANR PIPELINE CO | SANDWICH, Kendall, IL | Pass | State |
| 2025-12-16 | US SILICA CO | OTTAWA, La Salle, IL | Pass | State |
| 2025-12-16 | CITY WATER LIGHT & POWER | SPRINGFIELD, Sangamon, IL | Pass | State |
| 2025-12-16 | BUCKEYE TERMINALS LLC | ROCKFORD, Winnebago, IL | Pass | State |
| 2025-12-16 | HARRISON STEEL CASTINGS COMPANY — high-priority violation on file | ATTICA, Fountain, IN | Pass | State |
| 2025-12-16 | ET GATHERING & PROCESSING - HUGOTON #1 STATION (AIR) | HUGOTON, Haskell, KS | Pass | State |
| 2025-12-16 | TESSENDERLO KERLEY (AIR) | COFFEYVILLE, Montgomery, KS | Pass | State |
| 2025-12-16 | LOUISVILLE GAS & ELECTRIC | MAGNOLIA, Larue, KY | Pass | State |
| 2025-12-16 | LOGAN ALUMINUM INC | RUSSELLVILLE, Logan, KY | Pass | State |
| 2025-12-16 | BAY ST ELAINE GAS JUNCTION & DEHYDRATION FACILITY | DULAC, Terrebonne, LA | Pass | State |
| 2025-12-16 | CURTIS BAY ENERGY, LP — high-priority violation on file | BALTIMORE, Baltimore (city), MD | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.