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 |
|---|---|---|---|---|
| 2025-09-11 | DRY FORK STATION (BASIN ELECTRIC POWER COOP) | GILLETTE, Campbell, WY | Pass | State |
| 2025-09-11 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-09-11 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-09-11 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-09-11 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-09-11 | CHEYENNE PLANT (DYNO NOBEL INC) — high-priority violation on file | CHEYENNE, Laramie, WY | Pass | State |
| 2025-09-11 | CHEYENNE PLANT (DYNO NOBEL INC) — high-priority violation on file | CHEYENNE, Laramie, WY | Pass | State |
| 2025-09-11 | CHEYENNE PLANT (DYNO NOBEL INC) — high-priority violation on file | CHEYENNE, Laramie, WY | Pass | State |
| 2025-09-10 | TYLER-UNION FOUNDRY COMPANY | ANNISTON, Calhoun, AL | Pass | State |
| 2025-09-10 | TYLER-UNION FOUNDRY COMPANY | ANNISTON, Calhoun, AL | Pass | State |
| 2025-09-10 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2025-09-10 | ALABAMA POWER COMPANY | WILSONVILLE, Shelby, AL | Pass | State |
| 2025-09-10 | RAZORBACK GATHERING COMPANY, LLC. - TWIN GROVES CPF 1 | GREENBRIER, Faulkner, AR | Pass | State |
| 2025-09-10 | RAZORBACK GATHERING COMPANY, LLC. - TWIN GROVES CPF 1 | GREENBRIER, Faulkner, AR | Pass | State |
| 2025-09-10 | NOVO BIOPOWER, LLC | SNOWFLAKE, Navajo, AZ | Pass | State |
| 2025-09-10 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-09-10 | SFPPLP | SAN DIEGO, San Diego, CA | Pending | Local |
| 2025-09-10 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-10 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-10 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-10 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | HIGHWAY 59 LANDFILL — high-priority violation on file | MERCED, Merced, CA | Pass | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Fail | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Pass | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Pass | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Pass | Local |
| 2025-09-10 | BALL WESTERN CAN COMPANY | OAKDALE, Stanislaus, CA | Pass | Local |
| 2025-09-10 | CHEYENNE PLAINS GAS- KIRK COMP STAT | KIRK AREA, Yuma, CO | Pass | State |
| 2025-09-10 | MIDDLESEX HOSPITAL | MIDDLETOWN, Middlesex, CT | Pass | State |
| 2025-09-10 | UNITED ABRASIVES, INC — high-priority violation on file | WILLIMANTIC, Windham, CT | Fail | State |
| 2025-09-10 | SUWANNEE AMERICAN CEMENT COMPANY, LLC. | SUMTERVILLE, Sumter, FL | Pass | State |
| 2025-09-10 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-10 | ILC RESOURCES/IOWA LIMESTONE CO-PLTS 1&3 | ALDEN, Hardin, IA | Pass | State |
| 2025-09-10 | CLOW VALVE COMPANY | OSKALOOSA, Mahaska, IA | Pass | State |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | CITY OF CEDAR RAPIDS WPCF | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2025-09-10 | KINDER MORGAN LIQUIDS TERMINALS LLC | ELK GROVE VILLAGE, Cook, IL | Pass | State |
| 2025-09-10 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-10 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-10 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-10 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-10 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Fail | State |
| 2025-09-10 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | HOWARD MATERIALS LLC — high-priority violation on file | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-09-10 | KY UTILITIES CO - GHENT STATION | GHENT, Carroll, KY | Pass | State |
| 2025-09-10 | ARKEMA INC | CALVERT CITY, Marshall, KY | Pass | State |
| 2025-09-10 | MEDICAL AREA TOTAL ENERGY | BOSTON, CITY OF, Suffolk, MA | Pass | State |
| 2025-09-10 | ST MARYS CEMENT U.S. LLC, CHARLEVOIX PLANT | CHARLEVOIX, Charlevoix, MI | Pass | State |
| 2025-09-10 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2025-09-10 | AUDUBON MATERIALS, LLC - SUGAR CREEK PLANT | SUGAR CREEK, Jackson, MO | Pass | State |
| 2025-09-10 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Fail | State |
| 2025-09-10 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Fail | State |
| 2025-09-10 | MISSISSIPPI POWER COMPANY, DAVID M RATCLIFFE | DEKALB, Kemper, MS | Pass | State |
| 2025-09-10 | MISSISSIPPI POWER COMPANY, DAVID M RATCLIFFE | DEKALB, Kemper, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | WESTLAKE CHEMICALS AND VINYLS LLC | ABERDEEN, Monroe, MS | Pass | State |
| 2025-09-10 | HOOD INDUSTRIES INC, WAYNESBORO | WAYNESBORO, Wayne, MS | Pass | State |
| 2025-09-10 | HOOD INDUSTRIES INC, WAYNESBORO | WAYNESBORO, Wayne, MS | Pass | State |
| 2025-09-10 | S & D COFFEE, INC. | CONCORD, Cabarrus, NC | Pending | State |
| 2025-09-10 | GREENAMERICA BIOFUELS ORD LLC | ORD, Valley, NE | N/A | State |
| 2025-09-10 | WHITEHORN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.