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 |
|---|---|---|---|---|
| 2026-04-10 | ENVIVA NORTHAMPTON | GARYSBURG, Northampton, NC | Pending | State |
| 2026-04-10 | RED RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-10 | RED RAIDER COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-04-10 | ABU COMPRESSOR STATION — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-10 | ABU COMPRESSOR STATION — high-priority violation on file | JAL, Lea, NM | Pass | State |
| 2026-04-10 | MERCHANT CENTRAL BATTERY | EUNICE, Lea, NM | Pass | State |
| 2026-04-10 | ROBERNE COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-04-10 | ROBERNE COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-04-10 | ROBERNE COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | DTM UTICA, LLC - BELLE VALLEY COMPRESSOR STATION | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-04-10 | CNX MIDSTREAM OPR CO LLC/BUCKLAND COMP STA | WIND RIDGE, Greene, PA | Pass | State |
| 2026-04-10 | SPRINGTOWN GAS PROCESSING PLANT — high-priority violation on file | SPRINGTOWN, Parker, TX | N/A | State |
| 2026-04-10 | MONONGAHELA POWER COMPANY, HARRISON STATION | HAYWOOD, Harrison, WV | Pass | State |
| 2026-04-10 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-04-10 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-04-10 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-04-10 | BUCKING HORSE PLANT (JACKALOPE GAS GATHERING) | CONVERSE COUNTY, Converse, WY | Pass | State |
| 2026-04-10 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-10 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-10 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-10 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-10 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-10 | AUGUSTA-PEBBLE BEACH COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-04-09 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-04-09 | LHOIST NORTH AMERICA OF ALABAMA, LLC | CALERA, Shelby, AL | Pass | State |
| 2026-04-09 | HUNT REFINING COMPANY | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2026-04-09 | EASTERN AREA LANDFILL, BIRMINGHAM | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-09 | MAYCO INDUSTRIES, INC. | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-09 | MAYCO INDUSTRIES, INC. | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2026-04-09 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-1 | CLEVELAND, Conway, AR | Pass | State |
| 2026-04-09 | DESOTO GATHERING COMPANY, LLC - PHILLIPS MOUNTAIN CPF-2 | CLEVELAND, Conway, AR | Pass | State |
| 2026-04-09 | OZARK GAS TRANSMISSION, LLC. - RANEY COMPRESSOR STATION | WALNUT RIDGE, Lawrence, AR | Pass | State |
| 2026-04-09 | OZARK GAS TRANSMISSION, LLC. - RANEY COMPRESSOR STATION | WALNUT RIDGE, Lawrence, AR | Pass | State |
| 2026-04-09 | SO CAL GAS - BLYTHE | BLYTHE, Riverside, CA | Pass | Local |
| 2026-04-09 | SO CAL GAS - BLYTHE | BLYTHE, Riverside, CA | Pass | Local |
| 2026-04-09 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-09 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-04-09 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-04-09 | CEMEX CONSTRUCTION MATERIALS - LYONS — high-priority violation on file | LYONS AREA, Boulder, CO | Pass | State |
| 2026-04-09 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2026-04-09 | WES DJ FT LUPTON/PLATTE VALLEY/LANCASTER — high-priority violation on file | FORT LUPTON, Weld, CO | Pass | State |
| 2026-04-09 | NOBLE ENERGY - Y11 WASTE MANAGEMENT ECON | KEENESBURG, Weld, CO | Pass | State |
| 2026-04-09 | BIC CONSUMER PRODUCTS MANUFACTURING CO | MILFORD, New Haven, CT | Pending | State |
| 2026-04-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-09 | QUIKRETE CONSTRUCTION MATERIALS, LLC | NEWBERRY, Alachua, FL | Pass | State |
| 2026-04-09 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-09 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-09 | MIAMI-DADE WATER AND SEWER DEPARTMENT | MIAMI, Miami-Dade, FL | Pass | State |
| 2026-04-09 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-09 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-09 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-09 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-09 | JEA | JACKSONVILLE, Duval, FL | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | GRAPHIC PACKAGING INTERNATIONAL, LLC - MACON MILL | MACON, Bibb, GA | Pass | State |
| 2026-04-09 | ANCHOR GLASS CONTAINER CORPORATION - WARNER ROBINS PLANT — high-priority violation on file | WARNER ROBINS, Houston, GA | Fail | State |
| 2026-04-09 | ANCHOR GLASS CONTAINER CORPORATION - WARNER ROBINS PLANT — high-priority violation on file | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-04-09 | ANCHOR GLASS CONTAINER CORPORATION - WARNER ROBINS PLANT — high-priority violation on file | WARNER ROBINS, Houston, GA | Pass | State |
| 2026-04-09 | ANCHOR GLASS CONTAINER CORPORATION - WARNER ROBINS PLANT — high-priority violation on file | WARNER ROBINS, Houston, GA | Fail | State |
| 2026-04-09 | LAMAR QUARRY | BARNESVILLE, Lamar, GA | Pass | State |
| 2026-04-09 | STERLING SPECIALTY CHEMICALS USA LLC | COLUMBUS, Muscogee, GA | Pass | State |
| 2026-04-09 | CLEARWATER PAPER CORP-PPD | LEWISTON, Nez Perce, ID | Pass | State |
| 2026-04-09 | BRIDGER ROCK 00705 | PRESTON, Franklin, ID | Pass | State |
| 2026-04-09 | WAYNE CO LANDFILL INC | FAIRFIELD, Wayne, IL | Pending | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
| 2026-04-09 | MULZER CRUSHED STONE INCORPORATED (CAPE SANDY) A CRH COMPANY | LEAVENWORTH, Crawford, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.