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 |
|---|---|---|---|---|
| 2026-01-07 | ACE STERN VEGAS FACILITY | LOVING, Eddy, NM | Pass | State |
| 2026-01-07 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-07 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-07 | WINE MIXER 21-20 BATTERY NO1 | CARLSBAD, Eddy, NM | Pass | State |
| 2026-01-07 | SATURNIUS PAD V | LOVING, Eddy, NM | Pass | State |
| 2026-01-07 | TWISTED SISTER COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-07 | SEAWOLF COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-07 | LEA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-01-07 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-07 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-07 | BOREALIS MINE | HAWTHORNE, Mineral, NV | Pass | State |
| 2026-01-07 | ROCKIES EXPRESS PIPELINE - WASHINGTON CH COMPRESSOR STA | WASHINGTON COURT HOUSE, Fayette, OH | Pass | State |
| 2026-01-07 | ROCKIES EXPRESS PIPELINE - WASHINGTON CH COMPRESSOR STA | WASHINGTON COURT HOUSE, Fayette, OH | Pass | State |
| 2026-01-07 | ROCKIES EXPRESS PIPELINE - WASHINGTON CH COMPRESSOR STA | WASHINGTON COURT HOUSE, Fayette, OH | Pass | State |
| 2026-01-07 | ROCKIES EXPRESS PIPELINE - COLUMBUS COMPRESSOR STATION — high-priority violation on file | ASHVILLE, Pickaway, OH | Pass | State |
| 2026-01-07 | ROCKIES EXPRESS PIPELINE - COLUMBUS COMPRESSOR STATION — high-priority violation on file | ASHVILLE, Pickaway, OH | Pass | State |
| 2026-01-07 | ROCKIES EXPRESS PIPELINE - COLUMBUS COMPRESSOR STATION — high-priority violation on file | ASHVILLE, Pickaway, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | WRIGHT-PATTERSON AIR FORCE BASE | FAIRBORN, Greene, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2026-01-07 | ADVANCED CAST PRODUCTS/MEADVILLE — high-priority violation on file | MEADVILLE, Crawford, PA | Pass | State |
| 2026-01-07 | ETC NORTHEAST PIPELINE LLC/BARTO COMP STA | HUGHESVILLE, Lycoming, PA | Pass | State |
| 2026-01-07 | NFG MIDSTREAM COVINGTON LLC/MATZ COMP STA | CHATHAM, Tioga, PA | Pass | State |
| 2026-01-07 | WR-79 MITCHELL WELL PAD | MONTROSE, Susquehanna, PA | Pass | State |
| 2026-01-07 | TRANSCONTINENTAL GAS PIPELINE COMPANY, LLC | MOORE, Spartanburg, SC | Pass | State |
| 2026-01-07 | HUB CITY ENERGY, LLC — high-priority violation on file | ABERDEEN, Brown, SD | Pass | State |
| 2026-01-07 | GENPAK | CEDAR CITY, Iron, UT | Pass | State |
| 2026-01-07 | TRANS-JORDAN CITIES LANDFILL | SOUTH JORDAN, Salt Lake, UT | Pass | State |
| 2026-01-07 | HAMPTON ROADS BRIDGE TUNNEL I-64 EXPANSION - NORTH ISLAND | HAMPTON, Hampton (city), VA | Pass | State |
| 2026-01-07 | HAMPTON ROADS BRIDGE TUNNEL I-64 EXPANSION - NORTH ISLAND | HAMPTON, Hampton (city), VA | Pass | State |
| 2026-01-07 | WALMART SUPERCENTER #3216 | VIRGINIA BEACH, Virginia Beach (city), VA | Pass | State |
| 2026-01-07 | COLUMBIA GAS TRANSMISSION, LLC, SENECA | SENECA ROCKS, Pendleton, WV | Pass | State |
| 2026-01-06 | CITY OF DOTHAN SANITARY LANDFILL | DOTHAN, Houston, AL | Pass | State |
| 2026-01-06 | INDORAMA VENTURES XYLENES & PTA LLC | DECATUR, Morgan, AL | Pass | State |
| 2026-01-06 | SOUTHERN NATURAL GAS | YORK, Sumter, AL | Pass | State |
| 2026-01-06 | SOUTHERN NATURAL GAS | YORK, Sumter, AL | Pass | State |
| 2026-01-06 | SOUTHERN NATURAL GAS | NORTHPORT, Tuscaloosa, AL | Pass | State |
| 2026-01-06 | SOUTHERN NATURAL GAS | NORTHPORT, Tuscaloosa, AL | Pass | State |
| 2026-01-06 | SOUTHERN NATURAL GAS | NORTHPORT, Tuscaloosa, AL | Pass | State |
| 2026-01-06 | DESOTO GATHERING COMPANY, LLC. - PUMA CPF-1 | HEBER SPRINGS, Cleburne, AR | Pass | State |
| 2026-01-06 | DESOTO GATHERING COMPANY, LLC - MAKO CPF-1 | PANGBURN, White, AR | Pass | State |
| 2026-01-06 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2026-01-06 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-01-06 | CHEVRON COGENERATION COMPANY | BAKERSFIELD, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.