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.
What this page shows
This page covers Clean Air Act facilities in the EPA air register and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.