EPA Air · stack tests by year
Air-emissions stack tests in 2026
- 11,110Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2026
- Ohio 1,474
- Indiana 1,010
- California 979
- Florida 795
- Wyoming 755
- New Mexico 724
- Georgia 509
- Pennsylvania 501
- Arkansas 374
- Alabama 357
- Missouri 326
- Texas 316
- Mississippi 263
- Michigan 207
- North Carolina 188
- Colorado 185
- Iowa 167
- Illinois 165
- South Carolina 135
- Wisconsin 135
- West Virginia 114
- Virginia 98
- Idaho 96
- Montana 91
- Tennessee 84
- Minnesota 84
- Delaware 73
- Kentucky 71
- Arizona 71
- Connecticut 68
- Kansas 63
- Nevada 57
- Massachusetts 54
- North Dakota 52
- Nebraska 51
- Utah 51
- Washington 46
- Alaska 45
- New York 43
- South Dakota 34
- District of Columbia 30
- New Hampshire 29
- Maryland 28
- Oregon 27
- Louisiana 26
- Hawaii 21
- Oklahoma 15
- Rhode Island 13
- Puerto Rico 5
- Maine 5
Other years
Air-emissions stack tests recorded in 2026
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2026-02-20 | USS/CLAIRTON WORKS — high-priority violation on file | CLAIRTON, Allegheny, PA | Pass | Local |
| 2026-02-20 | HONEA PATH GENERATING FACILITY | HONEA PATH, Abbeville, SC | Pass | State |
| 2026-02-20 | NUCOR STEEL MEMPHIS | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-20 | QTS RICHMOND DATA CENTER — high-priority violation on file | SANDSTON, Henrico, VA | Pass | State |
| 2026-02-20 | DOMINION ENERGY - HOPEWELL POWER STATION | HOPEWELL, Hopewell (city), VA | Pass | State |
| 2026-02-20 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2026-02-20 | CEDAR GROVE COMPOST CO | MAPLE VALLEY, King, WA | Pass | Local |
| 2026-02-19 | RAZORBACK GATHERING COMPANY, LLC. - PEAR TREE CPF 1 | PANGBURN, White, AR | Pass | State |
| 2026-02-19 | RAZORBACK GATHERING COMPANY, LLC. - PEAR TREE CPF 1 | PANGBURN, White, AR | Pass | State |
| 2026-02-19 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2026-02-19 | AIR LIQUID LARGE INDUSTRIES US, LP | EL SEGUNDO, Los Angeles, CA | Pass | Local |
| 2026-02-19 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-02-19 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-02-19 | PDC ENERGY, INC. - GOLDEN EAGLE HZ | SEVERANCE AREA, Weld, CO | N/A | State |
| 2026-02-19 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-02-19 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2026-02-19 | FLORIDA POWER & LIGHT (PMR) | INDIANTOWN, Martin, FL | Pass | State |
| 2026-02-19 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-02-19 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2026-02-19 | FLORIDA MUNICIPAL POWER AGENCY | BARTOW, Polk, FL | Pass | State |
| 2026-02-19 | FLORIDA MUNICIPAL POWER AGENCY | BARTOW, Polk, FL | Pass | State |
| 2026-02-19 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-19 | SUWANNEE AMERICAN CEMENT COMPANY LLC | BRANFORD, Suwannee, FL | Pass | State |
| 2026-02-19 | TENASKA GEORGIA GENERATING STATION | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-19 | TENASKA GEORGIA GENERATING STATION | FRANKLIN, Heard, GA | Pass | State |
| 2026-02-19 | HECO - WAIAU | PEARL CITY, Honolulu, HI | Pass | State |
| 2026-02-19 | GAS TRANSMISSION NORTHWEST - COMPRESSOR STATION 04 - SANDPOINT — high-priority violation on file | SANDPOINT, Bonner, ID | Pass | State |
| 2026-02-19 | NATURAL GAS PIPELINE CO OF AMERICA | HERSCHER, Kankakee, IL | Pass | State |
| 2026-02-19 | SCOUT ENERGY - ULYSSES WEST MAIN STATION (AIR) | ULYSSES, Grant, KS | Pass | State |
| 2026-02-19 | TEXAS EASTERN TRANSMISSION LP - DANVILLE COMPRESSOR STATION | DANVILLE, Boyle, KY | Pass | State |
| 2026-02-19 | BIG RIVERS ELECTRIC CORP - DB WILSON STATION — high-priority violation on file | CENTERTOWN, Ohio, KY | Pass | State |
| 2026-02-19 | PHARMACIA & UPJOHN CO LLC, A SUBSIDIARY OF PFIZER | KALAMAZOO, Kalamazoo, MI | Pass | State |
| 2026-02-19 | NORTHERN NATURAL GAS - FARMINGTON | FARMINGTON, Dakota, MN | Pass | State |
| 2026-02-19 | DUKE ENERGY CAROLINAS, LLC - MARSHALL STEAM STATION | TERRELL, Catawba, NC | Pending | State |
| 2026-02-19 | AMERICAN WOOD FIBERS - LAURINBURG — high-priority violation on file | LAURINBURG, Scotland, NC | Pending | State |
| 2026-02-19 | WAYNE COUNTY MUNICIPAL SOLID WASTE LANDFILL | DUDLEY, Wayne, NC | Pass | State |
| 2026-02-19 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-02-19 | HUSKER AG LLC | PLAINVIEW, Pierce, NE | Pass | State |
| 2026-02-19 | CATALINA COMPRESSOR STATION | LA HUERTA, Eddy, NM | Pass | State |
| 2026-02-19 | STRAWBERRY FIELDS BOOSTER STATION | LOCO HILLS, Eddy, NM | Pass | State |
| 2026-02-19 | COLEMAN FACILITY | LOVING, Eddy, NM | Pass | State |
| 2026-02-19 | JEFF HART EAST TB | JAL, Lea, NM | Pass | State |
| 2026-02-19 | JEFF HART WEST | JAL, Lea, NM | Pass | State |
| 2026-02-19 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-19 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-19 | GEORGIA PACIFIC GYPSUM, LLC | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-02-19 | B&B LUMBER COMPANY, INC. | ANNSVILLE, Oneida, NY | Fail | State |
| 2026-02-19 | KENT STATE UNIVERSITY HEATING PLANT | KENT, Portage, OH | Pass | State |
| 2026-02-19 | KENT STATE UNIVERSITY HEATING PLANT | KENT, Portage, OH | Pass | State |
| 2026-02-19 | SUSQUEHANNA GATHERING CO 1 LLC/CDP 2 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2026-02-19 | NFG MIDSTREAM COVINGTON LLC/TRACT 007 COMP STA | WELLSBORO, Tioga, PA | Pass | State |
| 2026-02-19 | EQT ARTEMIS MIDSTREAM LLC/ROGERS COMP STA — high-priority violation on file | NEW KENSINGTON, Westmoreland, PA | Pass | State |
| 2026-02-19 | VANDERMARK, R. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-02-19 | KINDER MORGAN SE TERMINALS LLC - NORTH AUGUSTA 2 TERMINAL | NORTH AUGUSTA, Aiken, SC | Pass | State |
| 2026-02-19 | GREER COMMISSION OF PUBLIC WORKS - WATER TREATMENT PLANT | GREER, Greenville, SC | Pass | State |
| 2026-02-19 | VALENITE GENERATING FACILITY | WESTMINSTER, Oconee, SC | Pass | State |
| 2026-02-19 | VALERO REFINING COMPANY-TN LLC | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-02-19 | CHICO GAS PLANT | CHICO, Wise, TX | Pass | State |
| 2026-02-19 | KENTUCKY POWER COMPANY, MITCHELL PLANT | MOUNDSVILLE, Marshall, WV | Pass | State |
| 2026-02-19 | ANTERO MIDSTREAM LLC, MONROE STATION | ALMA, Tyler, WV | Pass | State |
| 2026-02-18 | ASCEND PERFORMANCE MATERIALS LLC — high-priority violation on file | DECATUR, Morgan, AL | Pass | State |
| 2026-02-18 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-18 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2026-02-18 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2026-02-18 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
| 2026-02-18 | CALIFORNIA RESOURCES ELK HILLS LLC — high-priority violation on file | TUPMAN, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.