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 |
|---|---|---|---|---|
| 2025-11-26 | VOSS CLARK DBA PGP CORP | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2025-11-26 | EVERGY - LA CYGNE (AIR) | LA CYGNE, Linn, KS | Pass | State |
| 2025-11-26 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-26 | EAST KY POWER COOP - SPURLOCK STATION | MAYSVILLE, Mason, KY | Pass | State |
| 2025-11-26 | MDU - GLENDIVE | GLENDIVE, Dawson, MT | Pass | State |
| 2025-11-26 | HACKBERRY COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-11-26 | DIMENSIONS 6 GAS LIFT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-26 | DIMENSIONS 6 GAS LIFT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-26 | DIMENSIONS 6 GAS LIFT COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-11-26 | ALAMO COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | TRUMBULL ENERGY CENTER | LORDSTOWN, Trumbull, OH | Pass | State |
| 2025-11-26 | ATI FLAT ROLLED PRODUCTS HOLDINGS LLC/VANDERGRIFT | VANDERGRIFT, Westmoreland, PA | Pass | State |
| 2025-11-26 | PA STATE UNIV/UNIV PARK CAMPUS | UNIVERSITY PARK, Centre, PA | Pass | State |
| 2025-11-26 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-26 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2025-11-25 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-25 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-25 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-25 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-25 | SANDERS LEAD CO | TROY, Pike, AL | Pass | State |
| 2025-11-25 | RAZORBACK GATHERING COMPANY, LLC. - JUDSONIA CPF 1 | JUDSONIA, White, AR | Pass | State |
| 2025-11-25 | LA CITY DWP- VALLEY GENERATING STN | SUN VALLEY, Los Angeles, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-11-25 | WES DJ GAS PROC - WATTENBERG PLANT | AURORA, Adams, CO | N/A | State |
| 2025-11-25 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-25 | CMC STEEL US, LLC | JACKSONVILLE, Duval, FL | Pass | State |
| 2025-11-25 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2025-11-25 | SEABOARD TRIUMPH FOODS, LLC — high-priority violation on file | CITY OF SIOUX CITY, Woodbury, IA | Pass | State |
| 2025-11-25 | HINSDALE HOSPITAL | HINSDALE, DuPage, IL | Pass | State |
| 2025-11-25 | HINSDALE HOSPITAL | HINSDALE, DuPage, IL | Pass | State |
| 2025-11-25 | HINSDALE HOSPITAL | HINSDALE, DuPage, IL | Pass | State |
| 2025-11-25 | HINSDALE HOSPITAL | HINSDALE, DuPage, IL | Pass | State |
| 2025-11-25 | RIVERSIDE HOSPITAL | KANKAKEE, Kankakee, IL | Pass | State |
| 2025-11-25 | RIVERSIDE HOSPITAL | KANKAKEE, Kankakee, IL | Pass | State |
| 2025-11-25 | RIVERSIDE HOSPITAL | KANKAKEE, Kankakee, IL | Pass | State |
| 2025-11-25 | ANR PIPELINE COMPANY SHELBYVILLE COMPRESSOR STATION | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-11-25 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | BIO TOWN BIOGAS LLC & BIO TOWN AG INCORPORATED — high-priority violation on file | REYNOLDS, White, IN | Pass | State |
| 2025-11-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-25 | HARSHMAN CONST (MASTER EQUIP LIST) (AIR) | CEDAR POINT, Marion, KS | Pass | State |
| 2025-11-25 | MID-STATES MATERIALS (MASTER EQUIP LIST 2) (AIR) | TOPEKA, Wallace, KS | Pass | State |
| 2025-11-25 | ND PAPER INC. | RUMFORD, Oxford, ME | Pass | State |
| 2025-11-25 | MARATHON PETROLEUM COMPANY LP — high-priority violation on file | DETROIT, Wayne, MI | Pass | State |
| 2025-11-25 | AMRIZE CEMENT INC. — high-priority violation on file | ALPENA, Alpena, MI | Pass | State |
| 2025-11-25 | BUSHMILLS ETHANOL INC | ATWATER, Kandiyohi, MN | Pass | State |
| 2025-11-25 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2025-11-25 | WILLISTON BASIN - FORT PECK STATION | NASHUA, Valley, MT | Pass | State |
| 2025-11-25 | DUKE ENERGY PROGRESS, LLC - RICHMOND COUNTY TURBINES | HAMLET, Richmond, NC | Pending | State |
| 2025-11-25 | ASTRODOG PAD S | MALAGA, Eddy, NM | Pass | State |
| 2025-11-25 | WAYNE GAYLORD TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-11-25 | WAYNE GAYLORD TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-11-25 | TITAN TREATER PLANT NO1 | JAL, Lea, NM | Pass | State |
| 2025-11-25 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-25 | IGGLES TB | MONUMENT, Lea, NM | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | HOWMET AEROSPACE INC. | CUYAHOGA HEIGHTS, Cuyahoga, OH | Pass | State |
| 2025-11-25 | LINDY PAVING/WHEATLAND ASPHALT PLT | WHEATLAND, Mercer, PA | Pass | State |
| 2025-11-25 | ETC NORTHEAST PIPELINE LLC/BARTO COMP STA | HUGHESVILLE, Lycoming, PA | Pass | State |
| 2025-11-25 | NFG MIDSTREAM TROUT RUN LLC/TROUT RUN MTN COMP STA | TROUT RUN, Lycoming, PA | Pass | State |
| 2025-11-25 | TOWN OF WINNSBORO - ELECTRICAL DIVISION | WINNSBORO, Fairfield, SC | Pass | State |
| 2025-11-25 | REDFIELD ENERGY LLC — high-priority violation on file | REDFIELD, Beadle, SD | Pass | State |
| 2025-11-25 | AMERICAN SNUFF COMPANY, LLC | CLARKSVILLE, Montgomery, TN | Pass | State |
| 2025-11-25 | CARLEX GLASS AMERICA, LLC - NASHVILLE GLASS PLANT | NASHVILLE, Davidson, TN | Pass | Local |
| 2025-11-25 | TESORO WEST COAST/FORMER BP AMOCO | SALT LAKE CITY, Salt Lake, UT | Pass | State |
| 2025-11-25 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2025-11-25 | QUAD/GRAPHICS INC | SUSSEX, Waupaca, WI | Pass | State |
| 2025-11-25 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.