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 |
|---|---|---|---|---|
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | ELK CORPORATION OF TEXAS | SHAFTER, Kern, CA | Pass | Local |
| 2025-12-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-12-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-12-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-12-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-12-19 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-12-19 | TAMPA SHIP, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-19 | ANR PIPELINE COMPANY ST JOHN COMPRESSOR STATION | SAINT JOHN, Lake, IN | Pass | State |
| 2025-12-19 | ANR PIPELINE COMPANY ST JOHN COMPRESSOR STATION | SAINT JOHN, Lake, IN | Pass | State |
| 2025-12-19 | ANR PIPELINE COMPANY ST JOHN COMPRESSOR STATION | SAINT JOHN, Lake, IN | Pass | State |
| 2025-12-19 | ADVANCED MAGNESIUM ALLOYS CORPORATION — high-priority violation on file | ANDERSON, Madison, IN | Pass | State |
| 2025-12-19 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2025-12-19 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2025-12-19 | GERDAU MACSTEEL MONROE MILL — high-priority violation on file | MONROE, Monroe, MI | Pass | State |
| 2025-12-19 | CHOCTAW GENERATION LIMITED PARTNERSHIP, RED HILLS GENERATION FACILITY | ACKERMAN, Choctaw, MS | Pass | State |
| 2025-12-19 | CHOCTAW GENERATION LIMITED PARTNERSHIP, RED HILLS GENERATION FACILITY | ACKERMAN, Choctaw, MS | Pass | State |
| 2025-12-19 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-19 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-19 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-19 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-19 | MARTIN MARIETTA MATERIALS, INC. - KANNAPOLIS QUARRY | KANNAPOLIS, Rowan, NC | Pass | State |
| 2025-12-19 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-19 | PAUL FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-12-19 | NORTH CORRIDOR EAST CENTRAL GAS LIFT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-19 | MATCHBOX COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-12-19 | PONCHO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-19 | TAIT ELECTRIC GENERATING STATION | DAYTON, Montgomery, OH | Pass | State |
| 2025-12-19 | MCC MFG INC/LAFAYETTE HILL — high-priority violation on file | LAFAYETTE HILL, Montgomery, PA | Pass | State |
| 2025-12-19 | MTN GATHERING LLC/JEFFERSON COMP STA | BUTLER, Butler, PA | Pass | State |
| 2025-12-19 | HILCORP ENERGY CO/JEFFERSON MONTGOMERY STA | JEFFERSON TOWNSHIP, Mercer, PA | Pass | State |
| 2025-12-19 | RHODE ISLAND LFG GENCO LLC — high-priority violation on file | JOHNSTON, TOWN OF, Providence, RI | Pass | State |
| 2025-12-19 | NORTHRUP GRUMMAN SYSTEMS - PROMONTORY (FORMERLY ATK) | PROMONTORY (HISTORICAL), Box Elder, UT | Pass | State |
| 2025-12-19 | DYNAX AMERICA CORP USA — high-priority violation on file | ROANOKE, Botetourt, VA | Pass | State |
| 2025-12-19 | DARAB VENTURES ONE, TWO, SIX LLC | ASHBURN, Loudoun, VA | Pass | State |
| 2025-12-19 | CUMBERLAND MUNICIPAL UTILITY | CUMBERLAND, Barron, WI | Pass | State |
| 2025-12-18 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2025-12-18 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2025-12-18 | NEW GEORGIA LANDFILL, BIRMINGHAM | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2025-12-18 | NEW GEORGIA LANDFILL, BIRMINGHAM | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | GEORGIA-PACIFIC WOOD PRODUCTS, LLC--FORDYCE OSB | FORDYCE, Calhoun, AR | Pass | State |
| 2025-12-18 | CALPORTLAND - RILLITO CEMENT PLANT | MARANA, Pima, AZ | Pass | State |
| 2025-12-18 | SO CAL GAS CO/PLAYA DEL REY STORAGE | PLAYA DEL REY, Los Angeles, CA | Pass | Local |
| 2025-12-18 | AIR PROD & CHEM INC | CARSON, Los Angeles, CA | Pass | Local |
| 2025-12-18 | LEPRINO FOODS COMPANY - GREELEY PLANT | GREELEY, Weld, CO | Fail | State |
| 2025-12-18 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-18 | KONGSBERG AUTOMOTIVE — high-priority violation on file | SUFFIELD, Hartford, CT | Fail | State |
| 2025-12-18 | TAMPA SHIP, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2025-12-18 | HYALUS, INC. | HAWKINSVILLE, Pulaski, GA | Pass | State |
| 2025-12-18 | HYALUS, INC. | HAWKINSVILLE, Pulaski, GA | Pass | State |
| 2025-12-18 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2025-12-18 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-18 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-18 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-18 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-18 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-18 | ADM CLINTON BIOPROCESSING - CLINTON — high-priority violation on file | CLINTON, Clinton, IA | Pass | State |
| 2025-12-18 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-18 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2025-12-18 | CERNE CALCIUM CARBONATE LLC | FORT DODGE, Webster, IA | Pass | State |
| 2025-12-18 | US ENERGY INDIANAPOLIS TERMINAL | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-12-18 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Fail | State |
| 2025-12-18 | HARSHMAN CONST. - MELVERN QUARRY (AIR) | MELVERN, Osage, KS | Pass | State |
| 2025-12-18 | BIG RIVERS ELECTRIC CORP - DB WILSON STATION — high-priority violation on file | CENTERTOWN, Ohio, KY | Pass | State |
| 2025-12-18 | ARQ SOLUTIONS (RED RIVER) LLC - RED RIVER PLANT | COUSHATTA, Red River, LA | Pass | State |
| 2025-12-18 | VALERO REFINING - NEW ORLEANS LLC - ST CHARLES REFINERY | NORCO, St. Charles, LA | Pass | State |
| 2025-12-18 | DOMINION ENERGY COVE POINT LNG, LP | LUSBY, Calvert, MD | Pass | State |
| 2025-12-18 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2025-12-18 | FLINT HILLS RESOURCES PINE BEND REFINERY | ROSEMOUNT, Dakota, MN | Pass | State |
| 2025-12-18 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-18 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-18 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-12-18 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-18 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-18 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-18 | NOBLE HILL SANITARY LANDFILL | WILLARD, Greene, MO | Pass | State |
| 2025-12-18 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-18 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-18 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-18 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.