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 |
|---|---|---|---|---|
| 2025-08-20 | ONEOK FIELD SERVICES CO LLC / REDTAIL COMPRESSOR STATION | LINDSAY, Garvin, OK | Pass | State |
| 2025-08-20 | BCE MACH III LLC / KILGORE 1705 1 4MH PAD 3 4MH LNU 91 4H | CRESCENT, Kingfisher, OK | Pass | State |
| 2025-08-20 | BCE MACH LLC / EMERALD 27 28 13 1H STA | CAPRON, Woods, OK | Pass | State |
| 2025-08-20 | BCE MACH LLC / PARIS 12 27 13 1H STA | ALVA, Woods, OK | Pass | State |
| 2025-08-20 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2025-08-20 | STECKMAN RIDGE LP/CLEARVILLE | CLEARVILLE, Bedford, PA | Pass | State |
| 2025-08-20 | APPALACHIA MIDSTREAM SVC LLC/GRANVILLE STA 2 | GRANVILLE SUMMIT, Bradford, PA | Pass | State |
| 2025-08-20 | EXPAND OPERATING LLC/RU-71 BLUE BECK WELLPAD | MILFORD, Susquehanna, PA | Pass | State |
| 2025-08-20 | BLACKHILL ENERGY LLC/YOUNG COMP STA — high-priority violation on file | COLUMBIA CROSS ROADS, Bradford, PA | Pass | State |
| 2025-08-20 | USS/CLAIRTON WORKS — high-priority violation on file | CLAIRTON, Allegheny, PA | Pass | Local |
| 2025-08-20 | RHODE ISLAND LFG GENCO LLC — high-priority violation on file | JOHNSTON, TOWN OF, Providence, RI | Pass | State |
| 2025-08-20 | SANTEE COOPER CROSS GENERATING STATION — high-priority violation on file | PINEVILLE, Berkeley, SC | Pass | State |
| 2025-08-20 | BOISE CASCADE WOOD PRODUCTS, LLC — high-priority violation on file | CHESTER, Chester, SC | Pass | State |
| 2025-08-20 | BLYTHE WEST COLUMBIA PLANT - BLYTHE CONSTRUCTION INC | WEST COLUMBIA, Lexington, SC | Pass | State |
| 2025-08-20 | POET BIOREFINING - GROTON | GROTON, Brown, SD | Pass | State |
| 2025-08-20 | THOMPSON APPALACHIAN HARDWOODS, INC. — high-priority violation on file | HUNTLAND, Franklin, TN | Fail | State |
| 2025-08-20 | PACKAGING CORPORATION OF AMERICA | COUNCE, Hardin, TN | Pass | State |
| 2025-08-20 | HOOD CONTAINER CORPORATION | WAVERLY, Humphreys, TN | Pass | State |
| 2025-08-20 | INGENCO WHOLESALE POWER LLC - HENRICO | GLEN ALLEN, Henrico, VA | Pass | State |
| 2025-08-20 | ENVIVA SOUTHAMPTON | FRANKLIN, Southampton, VA | Pass | State |
| 2025-08-20 | WESTROCK VIRGINIA LLC - COVINGTON | COVINGTON, Covington (city), VA | Pass | State |
| 2025-08-20 | PORT TOWNSEND PAPER CORPORATION — high-priority violation on file | PORT TOWNSEND, Jefferson, WA | Pass | State |
| 2025-08-20 | HOLLYFRONTIER PUGET SOUND REFINERY | ANACORTES, Skagit, WA | Fail | Local |
| 2025-08-20 | LANXESS CORPORATION — high-priority violation on file | KALAMA, Cowlitz, WA | Pass | Local |
| 2025-08-20 | DAIRYLAND POWER COOP ALMA SITE | ALMA, Buffalo, WI | Pass | State |
| 2025-08-20 | CALUMET RENEWABLE ENERGY LLC - GROTEGUT/MAPLE LEAF FACILITY | NEWTON, Manitowoc, WI | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | JONATHON LIME PLANT & LIME KILN DUST LANDFILL (PETE LIEN & SONS INC) | ALBANY COUNTY, Albany, WY | Pass | State |
| 2025-08-20 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-08-20 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-08-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-20 | PINEDALE COMPLEX (HARVEST MIDSTREAM COMPANY) | SUBLETTE COUNTY, Sublette, WY | Pass | State |
| 2025-08-20 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-20 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-20 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-20 | BIG ISLAND MINE & REFINERY (SISECAM WYOMING LLC) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-08-19 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-08-19 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-08-19 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | MARION JUNCTION, Dallas, AL | Pass | State |
| 2025-08-19 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | MARION JUNCTION, Dallas, AL | Pass | State |
| 2025-08-19 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | MARION JUNCTION, Dallas, AL | Pass | State |
| 2025-08-19 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | MARION JUNCTION, Dallas, AL | Pass | State |
| 2025-08-19 | TENNESSEE GAS PIPELINE COMPANY, LLC | HAMILTON, Marion, AL | Pass | State |
| 2025-08-19 | TENNESSEE GAS PIPELINE COMPANY, LLC | HAMILTON, Marion, AL | Pass | State |
| 2025-08-19 | TENNESSEE GAS PIPELINE COMPANY, LLC | HAMILTON, Marion, AL | Pass | State |
| 2025-08-19 | TENNESSEE GAS PIPELINE COMPANY, LLC | HAMILTON, Marion, AL | Pass | State |
| 2025-08-19 | TENNESSEE GAS PIPELINE COMPANY, LLC | HAMILTON, Marion, AL | Pass | State |
| 2025-08-19 | TENNESSEE GAS PIPELINE COMPANY, LLC | HAMILTON, Marion, AL | Pass | State |
| 2025-08-19 | FMC CORPORATION | AXIS, Mobile, AL | Pass | State |
| 2025-08-19 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-08-19 | WESTROCK COATED BOARD LLC-MAHRT MILL | PHENIX CITY, Russell, AL | Pass | State |
| 2025-08-19 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-08-19 | DESOTO GATHERING COMPANY, LLC.-OLIVER CPF-1 | SEARCY, White, AR | Pass | State |
| 2025-08-19 | VERNON PUBLIC UTILITIES | LOS ANGELES, Los Angeles, CA | Pass | Local |
| 2025-08-19 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
| 2025-08-19 | PASTORIA ENERGY FACILITY, LLC | LEBEC, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.