EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 15,218Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,887
- California 1,849
- Indiana 1,315
- New Mexico 1,112
- Florida 1,099
- Wyoming 903
- Georgia 693
- Pennsylvania 636
- Arkansas 481
- Alabama 445
- Missouri 433
- Texas 337
- Mississippi 332
- Michigan 270
- Colorado 255
- Iowa 250
- North Carolina 239
- Illinois 224
- Wisconsin 190
- South Carolina 165
- Kansas 151
- West Virginia 140
- Virginia 119
- Montana 115
- Idaho 114
- Utah 109
- Minnesota 108
- Delaware 107
- Tennessee 106
- Kentucky 97
- Connecticut 92
- Washington 87
- Arizona 83
- Massachusetts 78
- Nebraska 74
- North Dakota 72
- New York 67
- Nevada 61
- Alaska 47
- New Hampshire 38
- South Dakota 36
- Louisiana 35
- District of Columbia 30
- Maryland 29
- Oregon 28
- Hawaii 24
- Rhode Island 19
- Maine 16
- Oklahoma 15
- Puerto Rico 6
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-08-06 | WALTER COMPRESSOR STATION | LOCO HILLS, Lea, NM | Pass | State |
| 2026-08-06 | WESTROCK-SOLVAY LLC | GEDDES, Onondaga, NY | Pass | State |
| 2026-08-06 | MAPLE GROVE MATERIALS, INC. - TIFFIN PLANT | TIFFIN, Seneca, OH | Pass | State |
| 2026-08-06 | PIXELLE SPEC SOLUTIONS LLC/SPRING GROVE — high-priority violation on file | SPRING GROVE, York, PA | Fail | State |
| 2026-08-06 | EQT MIDSTREAM COMPANY LLC/DEEMSTON WICKS COMP STA | FREDERICKTOWN, Washington, PA | Pass | State |
| 2026-08-06 | SWN PROD CO LLC/DEPUE COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-08-06 | TENNESSEE VALLEY AUTHORITY - GALLATIN FOSSIL PLANT | GALLATIN, Sumner, TN | Pending | State |
| 2026-08-06 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., SHERWOOD | WEST UNION, Doddridge, WV | Pass | State |
| 2026-08-06 | MARKWEST LIBERTY MIDSTREAM & RESOURCES, L.L.C., MOBLEY GAS PLANT | SMITHFIELD, Wetzel, WV | Pass | State |
| 2026-08-05 | SOUTHERN NATURAL GAS | SELMA, Dallas, AL | Pass | State |
| 2026-08-05 | SOUTHERN NATURAL GAS | SELMA, Dallas, AL | Pass | State |
| 2026-08-05 | SCOTTSBORO ELECTRIC POWER BOARD | SCOTTSBORO, Jackson, AL | Pass | State |
| 2026-08-05 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2026-08-05 | DESOTO GATHERING COMPANY, LLC - HAMMERHEAD CPF-1 | JUDSONIA, White, AR | Pass | State |
| 2026-08-05 | DESOTO GATHERING COMPANY, LLC - TIGER CPF-1 | BRADFORD, White, AR | Pass | State |
| 2026-08-05 | SACRAMENTO MUNICIPAL UTILITY DIST. FINANCING AUTHORITY DBA CAMPBELL POWER PLANT | SACRAMENTO, Sacramento, CA | Pass | Local |
| 2026-08-05 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-08-05 | SAPUTO CHEESE USA INC | TULARE, Tulare, CA | Pass | Local |
| 2026-08-05 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2026-08-05 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2026-08-05 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2026-08-05 | ASCEND PERFORMANCE MATERIALS OPERATIONS — high-priority violation on file | CANTONMENT, Escambia, FL | Pass | State |
| 2026-08-05 | FMPA & KISSIMMEE UTILITY AUTHORITY | INTERCESSION CITY, Osceola, FL | Pass | State |
| 2026-08-05 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-08-05 | DUKE ENERGY FLORIDA, LLC | BARTOW, Polk, FL | Pass | State |
| 2026-08-05 | DUKE ENERGY FLORIDA, LLC | BARTOW, Polk, FL | Pass | State |
| 2026-08-05 | GIW INDUSTRIES, INC. | GROVETOWN, Columbia, GA | Pass | State |
| 2026-08-05 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-08-05 | GEORGIA-PACIFIC SAVANNAH RIVER LLC | RINCON, Effingham, GA | Pass | State |
| 2026-08-05 | INTERNATIONAL PAPER COMPANY - ROME MILL | ROME, Floyd, GA | Pass | State |
| 2026-08-05 | DAHLBERG COMBUSTION TURBINE ELECTRIC GENERATING PLANT | NICHOLSON, Jackson, GA | Pass | State |
| 2026-08-05 | DAHLBERG COMBUSTION TURBINE ELECTRIC GENERATING PLANT | NICHOLSON, Jackson, GA | Pass | State |
| 2026-08-05 | CLEARWATER PAPER CORPORATION - AUGUSTA MILL — high-priority violation on file | AUGUSTA, Richmond, GA | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION 00098 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION 00604 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION 00605 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION INC 00680 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION INC 00682 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION INC 00683 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | WESTERN CONSTRUCTION INC 00736 | BOISE, Ada, ID | Pass | State |
| 2026-08-05 | PRIMARY PRODUCTS INGREDIENTS AMERICAS, LLC | LAFAYETTE, Tippecanoe, IN | Pass | State |
| 2026-08-05 | BROX INDUSTRIES INC | DRACUT, TOWN OF, Middlesex, MA | Pending | State |
| 2026-08-05 | BROX INDUSTRIES INC | DRACUT, TOWN OF, Middlesex, MA | Pending | State |
| 2026-08-05 | HOLLAND BOARD OF PUBLIC WORKS-HOLLAND ENERGY PARK | HOLLAND, Ottawa, MI | Pass | State |
| 2026-08-05 | NORTH AMERICAN NATURAL RESOURCES -VENICE PARK 9526 GENERATING STATION | LENNON, Shiawassee, MI | Fail | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | HORNERS ROCK MATERIAL LLC (PORT-0942) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-08-05 | SOUTHERN NATURAL GAS COMPANY LLC, GWINVILLE COMPRESSOR STATION — high-priority violation on file | NEW HEBRON, Jefferson Davis, MS | Pass | State |
| 2026-08-05 | SOUTHERN NATURAL GAS COMPANY LLC, GWINVILLE COMPRESSOR STATION — high-priority violation on file | NEW HEBRON, Jefferson Davis, MS | Pass | State |
| 2026-08-05 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-05 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-05 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2026-08-05 | NCEMC - BUXTON | BUXTON, Dare, NC | Pending | State |
| 2026-08-05 | WESTROCK KRAFT PAPER, LLC | ROANOKE RAPIDS, Halifax, NC | Pending | State |
| 2026-08-05 | FXI, INC. - HIGH POINT | HIGH POINT, Randolph, NC | Pending | State |
| 2026-08-05 | KAAPA PARTNERS AURORA LLC — high-priority violation on file | AURORA, Hamilton, NE | N/A | State |
| 2026-08-05 | CORRAL CANYON CS AND CTB | MALAGA, Eddy, NM | Pass | State |
| 2026-08-05 | RIVERBEND 11-14 CTB 1 | MALAGA, Eddy, NM | Pass | State |
| 2026-08-05 | RIVERBEND 11-14 CTB 1 | MALAGA, Eddy, NM | Pass | State |
| 2026-08-05 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-05 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-05 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-05 | SALADO DRAW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-05 | HARRIER COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-08-05 | CORIANDER COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-08-05 | FIBER-TECH INDUSTRIES INC — high-priority violation on file | WASHINGTON COURT HOUSE, Fayette, OH | Pass | State |
| 2026-08-05 | TEXAS EASTERN TRANS LP/HOLBROOK STA | WIND RIDGE, Greene, PA | Pass | State |
| 2026-08-05 | SEWARD GENERATING STATION/SEWARD | NEW FLORENCE, Indiana, PA | Pass | State |
| 2026-08-05 | FAYETTE ENERGY FACILITY/MASONTOWN | MASONTOWN, Fayette, PA | Pass | State |
| 2026-08-05 | ETC NORTHEAST FLD SVC LLC/PIKE COMP STA | ROCHESTER, Beaver, PA | Pass | State |
| 2026-08-05 | BKV OPR LLC/PLUSHANSKI WELL PAD | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2026-08-05 | BKV OPR LLC/MIRABELLI PAD | TUNKHANNOCK, Wyoming, PA | Pass | State |
| 2026-08-05 | EXPAND OPERATING LLC/RU-47 KARMAZIN PAD | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2026-08-05 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pass | State |
| 2026-08-05 | POET BIOPROCESSING - CHANCELLOR, LLC — high-priority violation on file | CHANCELLOR, Turner, SD | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | PEARSALL POWER PLANT | PEARSALL, Frio, TX | Pass | State |
| 2026-08-05 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-05 | SILVER CREEK PROCESSING PLANT | WEATHERFORD, Parker, TX | Pass | State |
| 2026-08-05 | EQM GATHERING OPCO, LLC, JANUS STATION | WEST UNION, Doddridge, WV | Pass | State |
| 2026-08-05 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-08-05 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-08-04 | MPLX TERMINAL LLC | MONTGOMERY, Montgomery, AL | Pass | State |
| 2026-08-04 | JOHNS MANVILLE INC. | PHENIX CITY, Russell, AL | Pass | State |
| 2026-08-04 | JOHNS MANVILLE INC. | PHENIX CITY, Russell, AL | Pass | State |
| 2026-08-04 | SOUTHERN NATURAL GAS | YORK, Sumter, AL | Pass | State |
| 2026-08-04 | SOUTHERN NATURAL GAS | YORK, Sumter, AL | 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 with stack tests in 2026. It lists 11,110 stack tests recorded nationwide in 2026.