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 |
|---|---|---|---|---|
| 2026-02-02 | BOOTLEG RIDGE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-02-02 | BOOTLEG RIDGE COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-02-02 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-02 | CADILLAC COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-02-02 | TEXANA COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-02 | TEXANA COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2026-02-02 | HF SINCLAIR NAVAJO REFINING LLC (LOVINGTON) | LOVINGTON, Lea, NM | N/A | State |
| 2026-02-02 | RED TANK 26 BOO STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-02-02 | RED TANK 26 BOO STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-02-02 | ANGRY ANGUS CTB | MONUMENT, Lea, NM | Pass | State |
| 2026-02-02 | REGENCY MARCELLUS GAS GATHERING/CANOE RUN COMP STA | SALLADASBURG, Lycoming, PA | Pass | State |
| 2026-02-02 | DTM TIOGA GAS GATHERING LLC/TIOGA CENTRALIZED DEHY FAC | WESTFIELD, Tioga, PA | Pass | State |
| 2026-02-02 | US STEEL CORP/IRVIN PLT | WEST MIFFLIN, Allegheny, PA | Pass | Local |
| 2026-02-02 | NORTHERN STATES PWR CO WHEATON GEN STA | EAU CLAIRE, Chippewa, WI | Pass | State |
| 2026-02-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-02-02 | PRCC COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-01-30 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-01-30 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-01-30 | BBT ALATENN, LLC | TANNER, Limestone, AL | Pass | State |
| 2026-01-30 | NATURAL GAS PIPELINE COMPANY OF AMERICA LLC - STATION 305 | TEXARKANA, Miller, AR | Pass | State |
| 2026-01-30 | TUCSON ELECTRIC POWER - SPRINGERVILLE GENERATING STATION | SPRINGERVILLE, Apache, AZ | Pass | State |
| 2026-01-30 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2026-01-30 | PACIFIC SOUTHWEST CONTAINERS — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-30 | PACIFIC SOUTHWEST CONTAINERS — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-30 | PACIFIC SOUTHWEST CONTAINERS — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-30 | PACIFIC SOUTHWEST CONTAINERS — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-30 | PACIFIC SOUTHWEST CONTAINERS — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-30 | PACIFIC SOUTHWEST CONTAINERS — high-priority violation on file | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-30 | SIMI VALLEY LANDFILL & RECYCLING CENTER — high-priority violation on file | SIMI VALLEY, Ventura, CA | Pass | Local |
| 2026-01-30 | GUARDIAN INDUSTRIES-CARLETON | CARLETON, Monroe, MI | Pass | State |
| 2026-01-30 | VONI EAST FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-01-30 | LEO THORSNESS FACILITY | JAL, Lea, NM | Pass | State |
| 2026-01-30 | EOG - RED HILLS SOLAR LOCALIZED GAS LIFT STATION | JAL, Lea, NM | Pass | State |
| 2026-01-30 | MARLAN EAST TANK BATTERY | EUNICE, Lea, NM | Pass | State |
| 2026-01-30 | GORDITA & TOSTADA CTB | EUNICE, Lea, NM | Pass | State |
| 2026-01-30 | SIEGE COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-30 | SIEGE COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-30 | BOLL WEEVIL 27 CTB 2 | JAL, Lea, NM | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - KENNETH LLOYD 5-14-7 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - KENNETH LLOYD 5-14-7 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - KENNETH LLOYD 5-14-7 PAD | LEESVILLE, Carroll, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - BOWERSTON 21-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - BOWERSTON 21-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2026-01-30 | EOG RESOURCES, INC. - BOWERSTON 21-13-6 PAD | BOWERSTON, Harrison, OH | Pass | State |
| 2026-01-30 | TOM STACK LLC / BIG SKY COMPRESSOR STATION | UNION CITY, Canadian, OK | Pass | State |
| 2026-01-30 | UNIV OF PGH/PGH CAMPUS | PITTSBURGH, Allegheny, PA | Pending | Local |
| 2026-01-29 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-01-29 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2026-01-29 | NEXTERA ENERGY PIPELINE HOLDINGS (LOWMAN), INC. | BUTLER, Choctaw, AL | Pass | State |
| 2026-01-29 | ALABAMA POWER COMPANY | BUCKS, Mobile, AL | Pass | State |
| 2026-01-29 | HYUNDAI MOTOR MANUFACTURING ALABAMA LLC. | MONTGOMERY, Montgomery, AL | Pass | State |
| 2026-01-29 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-01-29 | TOKAI CARBON GE LLC | OZARK, Franklin, AR | Pass | State |
| 2026-01-29 | TOKAI CARBON GE LLC | OZARK, Franklin, AR | Pass | State |
| 2026-01-29 | NATURAL GAS PIPELINE COMPANY OF AMERICA LLC - STATION 306 | MALVERN, Hot Spring, AR | Pass | State |
| 2026-01-29 | APACHE GENERATING STATION | COCHISE, Cochise, AZ | Pass | State |
| 2026-01-29 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | WOODLAND GENERATION STATION | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-01-29 | HARTFORD WATER POLLUTION CONTROL FACILITY — high-priority violation on file | HARTFORD, Hartford, CT | Fail | State |
| 2026-01-29 | FLORIDA POWER & LIGHT (PTF) | HOMESTEAD, Miami-Dade, FL | Pass | State |
| 2026-01-29 | MIAMI-DADE WATER AND SEWER DEPARTMENT | NORTH MIAMI, Miami-Dade, FL | Pass | State |
| 2026-01-29 | MIAMI-DADE WATER AND SEWER DEPARTMENT | NORTH MIAMI, Miami-Dade, FL | Pass | State |
| 2026-01-29 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-01-29 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-01-29 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Fail | State |
| 2026-01-29 | CLARIOS, LLC | TAMPA, Hillsborough, FL | Pass | State |
| 2026-01-29 | SOUTHERN NATURAL GAS COMPANY, L.L.C - RICEBORO COMP. STATION | RICEBORO, Liberty, GA | Pass | State |
| 2026-01-29 | SOUTHERN NATURAL GAS COMPANY, L.L.C - RICEBORO COMP. STATION | RICEBORO, Liberty, GA | Pass | State |
| 2026-01-29 | SOUTHERN NATURAL GAS COMPANY, L.L.C - RICEBORO COMP. STATION | RICEBORO, Liberty, GA | Pass | State |
| 2026-01-29 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-29 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-29 | PICO ENERGY LLC | JEROME, Jerome, ID | Pass | State |
| 2026-01-29 | VALERO RENEWABLE FUELS COMPANY LLC DBA VALERO BLUFFTON PLANT | BLUFFTON, Wells, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.