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 |
|---|---|---|---|---|
| 2025-09-03 | PECOS RIVER TREATER | MALAGA, Eddy, NM | Pass | State |
| 2025-09-03 | VANDELAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-03 | MOCKINGBIRD COMPRESSOR STATION | LOVING, Lea, NM | Pass | State |
| 2025-09-03 | VAN DOO DAH 33 CTB 3 | MALAGA, Lea, NM | Pass | State |
| 2025-09-03 | OWENS-BROCKWAY GLASS CONTAINER INC | AUBURN, Cayuga, NY | Pass | State |
| 2025-09-03 | AMERICAN PACKAGING CORP | ROCHESTER, Monroe, NY | Pass | State |
| 2025-09-03 | TRIAD HUNTER LLC - FORNI PAD | BENTON, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2025-09-03 | TRIAD HUNTER LLC - FORNI PAD | BENTON, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2025-09-03 | TRIAD HUNTER LLC - FORNI PAD | BENTON, TOWNSHIP OF, Monroe, OH | Pass | State |
| 2025-09-03 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-03 | EUREKA MIDSTREAM-ZINK COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-09-03 | DIVERSIFIED PRODUCTION LLC - MOONRAKER PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-03 | DIVERSIFIED PRODUCTION LLC - MOONRAKER PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-03 | DIVERSIFIED PRODUCTION LLC - MOONRAKER PAD | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-03 | BCE MACH LLC / FATBOY 29 32 12N 8W 3 4MHX REUTER 29 | EL RENO, Canadian, OK | Pass | State |
| 2025-09-03 | CALYX ENERGY III LLC / WASHINGTON PAD | DUSTIN, Hughes, OK | Pass | State |
| 2025-09-03 | CALYX ENERGY III LLC / MADISON PAD | DUSTIN, Hughes, OK | Pass | State |
| 2025-09-03 | BCE MACH III LLC / LSEOU 13 2HO LSEOU 14 4HO LSEOU 29 4HO | CRESCENT, Kingfisher, OK | Pass | State |
| 2025-09-03 | BCE MACH III LLC / LSEOU 13 2HO LSEOU 14 4HO LSEOU 29 4HO | CRESCENT, Kingfisher, OK | Pass | State |
| 2025-09-03 | BCE MACH LLC / PARKES FERN 1 8 PAD | HOOKER, Texas, OK | Pass | State |
| 2025-09-03 | EBENSBURG POWER CO/EBENSBURG COGENERATION PLT | EBENSBURG, Cambria, PA | Pass | State |
| 2025-09-03 | ARMSTRONG CEMENT & SUPPLY/WINFIELD — high-priority violation on file | CABOT, Butler, PA | Pass | State |
| 2025-09-03 | WESTMORELAND SANITARY LDFL LLC/BELLE VERNON — high-priority violation on file | BELLE VERNON, Westmoreland, PA | Fail | State |
| 2025-09-03 | JOHNSON MATTHEY INC/SMITHFIELD — high-priority violation on file | SMITHFIELD, Fayette, PA | Pass | State |
| 2025-09-03 | NFG MIDSTREAM COVINGTON LLC/KRAUSE COMP STA | MAINESBURG, Tioga, PA | Pass | State |
| 2025-09-03 | MARKWEST LIBERTY BLUESTONE LLC/BLUESTONE GAS PROC PLT | EVANS CITY, Butler, PA | Pass | State |
| 2025-09-03 | HEP PENNSYLVANIA GATHERING LLC/CLARK CPF 1 COMP STA | WYSOX, Bradford, PA | Pass | State |
| 2025-09-03 | PAYNE, D. PAD 1 | NEW MILFORD, Susquehanna, PA | Pass | State |
| 2025-09-03 | EXXONMOBIL BEAUMONT REFINERY — high-priority violation on file | BEAUMONT, Jefferson, TX | Pass | State |
| 2025-09-03 | PORT ARTHUR REFINERY — high-priority violation on file | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-03 | BAYPORT POLYMERS | PORT ARTHUR, Jefferson, TX | Pass | State |
| 2025-09-03 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-09-03 | AEROJET ROCKETDYNE, INC. | REDMOND, King, WA | Pass | Local |
| 2025-09-03 | AEROJET ROCKETDYNE, INC. | REDMOND, King, WA | Pass | Local |
| 2025-09-03 | MONONGAHELA POWER COMPANY, FORT MARTIN STATION | MAIDSVILLE, Monongalia, WV | Pass | State |
| 2025-09-03 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2025-09-03 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2025-09-03 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-03 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-03 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2025-09-02 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | CHEVRON USA_(FORMERLY MIDWAY SUNSET OIL) — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | MM TULARE ENERGY LLC VISALIA LANDFILL | VISALIA, Tulare, CA | Pass | Local |
| 2025-09-02 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Pass | State |
| 2025-09-02 | SAMPLE & SON CONSTRUCTION AND DEMOLITION LANDFILL — high-priority violation on file | GROVETOWN, Columbia, GA | Pass | State |
| 2025-09-02 | DROP YARD, LLC | LUTHERSVILLE, Meriwether, GA | Pass | State |
| 2025-09-02 | KINDER MORGAN LIQUIDS TERMINALS LLC | WOOD RIVER, Madison, IL | Pass | State |
| 2025-09-02 | DTE ST. CLAIR / BELLE RIVER POWER PLANT — high-priority violation on file | CHINA, St. Clair, MI | Pass | State |
| 2025-09-02 | COLUMBIA SOUTHERN STAR CENTRAL | COLUMBIA, Boone, MO | Pass | State |
| 2025-09-02 | NOBLE HILL SANITARY LANDFILL | WILLARD, Greene, MO | Pass | State |
| 2025-09-02 | BLACK OAK RECYCLING AND DISPOSAL FACILITY DIV WASTE CORPORATION OF MISSOURI INC | HARTVILLE, Wright, MO | Pass | State |
| 2025-09-02 | CANTON MUNICIPAL UTILITIES — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-09-02 | CANTON MUNICIPAL UTILITIES — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-09-02 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2025-09-02 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2025-09-02 | GREENLEAF CO2 SOLUTIONS LLC, WEST YELLOW CREEK COMPRESSOR STATION — high-priority violation on file | WAYNESBORO, Wayne, MS | Pass | State |
| 2025-09-02 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-09-02 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-09-02 | M. J. PRICE CONSTRUCTION CO., INC. | ROANOKE RAPIDS, Halifax, NC | Pass | State |
| 2025-09-02 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-02 | PLANTVIEW COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-09-02 | BLUE RACER MIDSTREAM LLC - HFS#1 (CADIZ B) | CADIZ, Harrison, OH | Pass | State |
| 2025-09-02 | BLUE RACER MIDSTREAM LLC - HFS#1 (CADIZ B) | CADIZ, Harrison, OH | Pass | State |
| 2025-09-02 | BLUE RACER MIDSTREAM LLC - HFS#1 (CADIZ B) | CADIZ, Harrison, OH | Pass | State |
| 2025-09-02 | PEAVINE PAD 952737 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-02 | PEAVINE PAD 952737 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-02 | PEAVINE PAD 952737 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-02 | GM CEREALS PROPERTIES, INC. | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-09-02 | GM CEREALS PROPERTIES, INC. | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-09-02 | ET GATHERING PROCESSING LLC / BURTSCHI COMPRESSOR STATION | NORGE, Grady, OK | Pass | State |
| 2025-09-02 | CALYX ENERGY III LLC / MAVERICK PAD | WETUMKA, Hughes, OK | Pass | State |
| 2025-09-02 | BCE MACH III LLC / POOL 2 17H LSEOU 36 3HO 35 2HO 35 3HO | DOVER, Kingfisher, OK | Pass | State |
| 2025-09-02 | BCE MACH III LLC / LSEOU 43 5HO PAD | DOVER, Kingfisher, OK | Pass | State |
| 2025-09-02 | BCE MACH III LLC / LSEOU 37 3HO LSEOU 37 4HO LSEOU 50 4HO | CRESCENT, Kingfisher, OK | Pass | State |
| 2025-09-02 | CALYX ENERGY III LLC / CHEATWOOD PAD | BEARDEN, Okfuskee, OK | Pass | State |
| 2025-09-02 | TALL OAK WOODFORD LLC / TREE HOUSE COMPRESSOR FACILITY | MCALESTER, Pittsburg, OK | Pass | State |
| 2025-09-02 | TALL OAK WOODFORD LLC / TREE HOUSE COMPRESSOR FACILITY | MCALESTER, Pittsburg, OK | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.