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.
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.