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 |
|---|---|---|---|---|
| 2025-12-11 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-11 | ALON BAKERSFIELD REFINING — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-11 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-12-11 | MANCHESTER LANDFILL | MANCHESTER, Hartford, CT | Pass | State |
| 2025-12-11 | BUCKEYE PT TERMINALS, L.P. - WATERFRONT STREET TERMINAL | NEW HAVEN, New Haven, CT | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | CONNER HOLDINGS, LLC | HOMERVILLE, Clinch, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | TALBOT ENERGY FACILITY | BOX SPRINGS, Talbot, GA | Pass | State |
| 2025-12-11 | GREEN PLAINS SHENANDOAH LLC (GP SHENANDOAH) | SHENANDOAH, Fremont, IA | Pass | State |
| 2025-12-11 | POET BIOREFINING - ARTHUR, LLC — high-priority violation on file | ARTHUR, Ida, IA | Pass | State |
| 2025-12-11 | US FOODS - CORALVILLE | CORALVILLE, Johnson, IA | Pass | State |
| 2025-12-11 | US FOODS - CORALVILLE | CORALVILLE, Johnson, IA | Pass | State |
| 2025-12-11 | H & B CRUSHING 00380 | KUNA, Ada, ID | Pass | State |
| 2025-12-11 | H & B CRUSHING 00595 | KUNA, Ada, ID | Pass | State |
| 2025-12-11 | H & B CRUSHING 00596 | KUNA, Ada, ID | Pass | State |
| 2025-12-11 | H & B CRUSHING 00597 | KUNA, Ada, ID | Pass | State |
| 2025-12-11 | H & B CRUSHING 00598 | KUNA, Ada, ID | Pass | State |
| 2025-12-11 | H & B CRUSHING 00615 | KUNA, Ada, ID | Pass | State |
| 2025-12-11 | ARDAGH GLASS INCORPORATED | DUNKIRK, Jay, IN | Pass | State |
| 2025-12-11 | ARDAGH GLASS INCORPORATED | DUNKIRK, Jay, IN | Pass | State |
| 2025-12-11 | ARDAGH GLASS INCORPORATED | DUNKIRK, Jay, IN | Pass | State |
| 2025-12-11 | ARDAGH GLASS INCORPORATED | DUNKIRK, Jay, IN | Pass | State |
| 2025-12-11 | ANR PIPELINE COMPANY LAGRANGE COMPRESSOR STATION — high-priority violation on file | LAGRANGE, LaGrange, IN | Pass | State |
| 2025-12-11 | VENTURE GLOBAL PLAQUEMINES LNG LLC - PLAQUEMINES LNG TERMINAL | PORT SULPHUR, Plaquemines, LA | Pass | State |
| 2025-12-11 | GLWA WATER RESOURCE RECOVERY FACILITY | DETROIT, Wayne, MI | Pass | State |
| 2025-12-11 | J. H. CAMPBELL PLANT | WEST OLIVE, Ottawa, MI | Pass | State |
| 2025-12-11 | LANSING BOARD OF WATER & LIGHT - ERICKSON STATION | LANSING, Eaton, MI | Pass | State |
| 2025-12-11 | ABBOTT NORTHWESTERN HOSPITAL | MINNEAPOLIS, Hennepin, MN | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-11 | TELLUS OPERATING GROUP LLC, RALEIGH CO2 PLANT | RALEIGH, Smith, MS | Pass | State |
| 2025-12-11 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pass | State |
| 2025-12-11 | DAVIDSON GAS PRODUCERS, LLC - DAVIDSON CO. LANDFILL | LEXINGTON, Davidson, NC | Pass | State |
| 2025-12-11 | NORTHERN NATURAL GAS COMPANY | HOMER, Dakota, NE | Pass | State |
| 2025-12-11 | 3600 NORTH PLATTE COMPRESSOR | NORTH PLATTE, Lincoln, NE | Pass | State |
| 2025-12-11 | POSEIDON CTB | JAL, Eddy, NM | Pass | State |
| 2025-12-11 | VALDEZ BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-11 | IRVIN WALL STATE COM NO131H | JAL, Lea, NM | Pass | State |
| 2025-12-11 | CARL MOTTEK FED TANK BATTERY | JAL, Lea, NM | Pass | State |
| 2025-12-11 | RHEA LGL STATION | MALAGA, Lea, NM | Pass | State |
| 2025-12-11 | RHEA LGL STATION | MALAGA, Lea, NM | Pass | State |
| 2025-12-11 | RHEA LGL STATION | MALAGA, Lea, NM | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | MOMENTIVE PERFORMANCE MATERIALS QUARTZ, INC. | HEBRON, Licking, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | Pass | State |
| 2025-12-11 | CLARIOS, LLC. | HOLLAND, Lucas, OH | 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.