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 |
|---|---|---|---|---|
| 2026-06-18 | PAINTER COMPRESSOR STATION (KERN RIVER GAS TRANSMISSION) | EVANSTON, Uinta, WY | Pass | State |
| 2026-06-17 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-06-17 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-06-17 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BUTLER, Choctaw, AL | Pass | State |
| 2026-06-17 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BUTLER, Choctaw, AL | Pass | State |
| 2026-06-17 | GEORGIA-PACIFIC BREWTON LLC | BREWTON, Escambia, AL | Pass | State |
| 2026-06-17 | GEORGIA-PACIFIC BREWTON LLC | BREWTON, Escambia, AL | Pass | State |
| 2026-06-17 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2026-06-17 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2026-06-17 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | N/A | State |
| 2026-06-17 | COORSTEK INC - CLEAR CREEK VALLEY PLANT — high-priority violation on file | GOLDEN AREA, Jefferson, CO | N/A | State |
| 2026-06-17 | FORT MYER CONSTRUCTION PLANT I | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-06-17 | SEMINOLE ELECTRIC COOPERATIVE, INC. | BOWLING GREEN, Hardee, FL | Pass | State |
| 2026-06-17 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-06-17 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-06-17 | C. W. MATHEWS CONTRACTING CO, INC | PEACHTREE CORNERS, Gwinnett, GA | Pass | State |
| 2026-06-17 | SMARR ENERGY FACILITY | SMARR, Monroe, GA | Pass | State |
| 2026-06-17 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-17 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Fail | State |
| 2026-06-17 | THE ANDERSONS MARATHON HOLDINGS LLC — high-priority violation on file | DENISON, Crawford, IA | Pass | State |
| 2026-06-17 | SUPERIOR BLASTING INC 00708 | BOISE, Ada, ID | Pass | State |
| 2026-06-17 | SUNCORE CONSTRUCTION & MATERIALS 00722 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-06-17 | CITY OF CASEY | CASEY, Clark, IL | Pass | State |
| 2026-06-17 | CITY OF ALTAMONT | ALTAMONT, Effingham, IL | Pass | State |
| 2026-06-17 | HARRISON STEEL CASTINGS COMPANY — high-priority violation on file | ATTICA, Fountain, IN | Pass | State |
| 2026-06-17 | SIGECO - FB CULLEY GENERATING STATION | NEWBURGH, Warrick, IN | Pass | State |
| 2026-06-17 | DTE GAS COMPANY - COLUMBUS COMPRESSOR STATION — high-priority violation on file | COLUMBUS, St. Clair, MI | Pass | State |
| 2026-06-17 | UNIVERSITY OF MICHIGAN | ANN ARBOR, Washtenaw, MI | Pass | State |
| 2026-06-17 | LACKS ENTERPRISES, INC. — high-priority violation on file | GRAND RAPIDS, Kent, MI | Pass | State |
| 2026-06-17 | GRANGER WOOD STREET LANDFILL — high-priority violation on file | LANSING, Clinton, MI | Pass | State |
| 2026-06-17 | MANE INGREDIENTS USA, INC. | MERRY HILL, Bertie, NC | Pending | State |
| 2026-06-17 | SHARPE BROS., A DIV. OF VECELLIO & GROGAN, INC.-LEBANON RD. | GREENSBORO, Guilford, NC | Pending | State |
| 2026-06-17 | DUKE ENERGY PROGRESS, LLC - RICHMOND COUNTY TURBINES | HAMLET, Richmond, NC | Pending | State |
| 2026-06-17 | CANAL AG RECYCLING LLC — high-priority violation on file | TURKEY, Sampson, NC | Pending | State |
| 2026-06-17 | HITCHINER MANUFACTURING CO., INC. | MILFORD, Hillsborough, NH | Pending | State |
| 2026-06-17 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-06-17 | OHIO MIDSTREAM PARTNERS SAND HILLS COMPRESSOR STATION | NEFFS, Belmont, OH | Pass | State |
| 2026-06-17 | OHIO MIDSTREAM PARTNERS SAND HILLS COMPRESSOR STATION | NEFFS, Belmont, OH | Pass | State |
| 2026-06-17 | OHIO MIDSTREAM PARTNERS SAND HILLS COMPRESSOR STATION | NEFFS, Belmont, OH | Pass | State |
| 2026-06-17 | ASCENT RESOURCES - UTICA LLC - MINGO CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-17 | ASCENT RESOURCES - UTICA LLC - MINGO CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-17 | ASCENT RESOURCES - UTICA LLC - MINGO CRC JF | BLOOMINGDALE, Jefferson, OH | Pass | State |
| 2026-06-17 | ASCENT RESOURCES - UTICA LLC - AMBER WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-06-17 | ASCENT RESOURCES - UTICA LLC - AMBER WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-06-17 | ASCENT RESOURCES - UTICA LLC - AMBER WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2026-06-17 | SUNOCO LLC/MH RACE FUELS — high-priority violation on file | MARCUS HOOK, Delaware, PA | Pass | State |
| 2026-06-17 | EQT PROD CO/MOJO COMPRESSOR UNIT | WASHINGTON, Washington, PA | Pass | State |
| 2026-06-17 | NFG MIDSTREAM TROUT RUN LLC/HAGERMAN GAS & PROC METERING FAC | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-06-17 | ADVANSIX (FORMERLY HONEYWELL/FRANKFORD PLT) — high-priority violation on file | PHILADELPHIA, Philadelphia, PA | Pending | Local |
| 2026-06-17 | MARTIN MARIETTA MATERIALS INC CHESTERFIELD QUARRY | JEFFERSON, Chesterfield, SC | Pass | State |
| 2026-06-17 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pass | State |
| 2026-06-17 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pass | State |
| 2026-06-17 | TENNESSEE VALLEY AUTHORITY - GALLATIN FOSSIL PLANT | GALLATIN, Sumner, TN | Pass | State |
| 2026-06-17 | CROWN CORK AND SEAL PLANT 66 | LA CROSSE, La Crosse, WI | Pass | State |
| 2026-06-17 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-06-17 | APPALACHIA MIDSTREAM SERVICES, L.L.C., SAND HILL STATION | DALLAS, Marshall, WV | Pass | State |
| 2026-06-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-06-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-06-17 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-06-17 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-17 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-17 | OPAL GAS PLANT (WILLIAMS FIELD SERVICES) | OPAL, Lincoln, WY | Pass | State |
| 2026-06-17 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2026-06-17 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2026-06-16 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-06-16 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-06-16 | TESORO ALASKA COMPANY, LLC / KENAI REFINERY — high-priority violation on file | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-06-16 | INTERNATIONAL PAPER COMPANY — high-priority violation on file | SELMA, Dallas, AL | Pass | State |
| 2026-06-16 | GEORGIA-PACIFIC BREWTON LLC | BREWTON, Escambia, AL | Pass | State |
| 2026-06-16 | ANTHONY TIMBERLANDS, INC. - BEARDEN | BEARDEN, Ouachita, AR | Pass | State |
| 2026-06-16 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-16 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-16 | CALIFORNIA RESOURCES PRODUCTION CORP | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | LIBERTY PACKING CO. | VOLTA, Merced, CA | Pass | Local |
| 2026-06-16 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pass | State |
| 2026-06-16 | BARGATH LLC - PARACHUTE CREEK GAS PLANT | PARACHUTE 2.9 MI. NW OF, Garfield, CO | Pending | State |
| 2026-06-16 | DCP OPERATING CO - ENTERPRISE C.S. — high-priority violation on file | KEENESBURG 5.2 MI. N OF, Weld, CO | Pass | State |
| 2026-06-16 | FORT MYER CONSTRUCTION PLANT I | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-06-16 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-06-16 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.