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.