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 |
|---|---|---|---|---|
| 2026-03-04 | EOG - ANACONDA LGL STATION | JAL, Lea, NM | Pass | State |
| 2026-03-04 | EOG - ANACONDA LGL STATION | JAL, Lea, NM | Pass | State |
| 2026-03-04 | EOG - ANACONDA LGL STATION | JAL, Lea, NM | Pass | State |
| 2026-03-04 | NINA CORTELL SOUTH TB | LOVING, Lea, NM | Pass | State |
| 2026-03-04 | WOODCHOPPER PAD 952995 | MACKSBURG, Washington, OH | Pass | State |
| 2026-03-04 | WOODCHOPPER PAD 952995 | MACKSBURG, Washington, OH | Pass | State |
| 2026-03-04 | WOODCHOPPER PAD 952995 | MACKSBURG, Washington, OH | Pass | State |
| 2026-03-04 | EASTERN GAS TRANS & STORAGE/ROCHESTER MILLS | ROCHESTER MILLS, Indiana, PA | Pass | State |
| 2026-03-04 | BERRYVILLE GRAPHICS/FAIRFIELD | FAIRFIELD, Adams, PA | Pass | State |
| 2026-03-04 | CLARION BOARDS/CLARION PLT | SHIPPENVILLE, Clarion, PA | Pass | State |
| 2026-03-04 | NEXTERA RENEWABLE FUELS LLC/FREY FARM CRESWELL LDFL | CONESTOGA, Lancaster, PA | Pass | State |
| 2026-03-04 | MARKWEST LIBERTY BLUESTONE LLC/VOLL COMP STA | EVANS CITY, Butler, PA | Pass | State |
| 2026-03-04 | EQT ARO LLC/VARGO COMP STA — high-priority violation on file | TROUT RUN, Lycoming, PA | Pass | State |
| 2026-03-04 | REGENCY MARCELLUS GAS GATHERING LLC/TAYLOR COMP STA | CANTON, Bradford, PA | Pass | State |
| 2026-03-04 | SYLVAMO NORTH AMERICA LLC - EASTOVER MILL | EASTOVER, Richland, SC | Pass | State |
| 2026-03-04 | PILGRIMS PRIDE CORPORATION | SUMTER, Sumter, SC | Pass | State |
| 2026-03-04 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-03-04 | BADGER STATE ETHANOL, INC. — high-priority violation on file | MONROE, Green, WI | Pass | State |
| 2026-03-04 | OMNIS PLEASANTS, LLC, PLEASANTS POWER STATION | WILLOW ISLAND, Pleasants, WV | Pass | State |
| 2026-03-04 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-03-04 | HF SINCLAIR PARCO REFINING LLC — high-priority violation on file | SINCLAIR, Carbon, WY | Pass | State |
| 2026-03-04 | JIM BRIDGER PLANT (PACIFICORP) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-03-04 | JIM BRIDGER PLANT (PACIFICORP) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2026-03-03 | ALASKA PIPELINE COMPANY (ENSTAR NATURA / GUDENRATH COMPRESSOR STATION | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-03-03 | ALASKA PIPELINE COMPANY (ENSTAR NATURA / GUDENRATH COMPRESSOR STATION | KENAI, Kenai Peninsula, AK | Pass | State |
| 2026-03-03 | COASTAL FOREST PRODUCTS LLC | CHAPMAN, Butler, AL | Pass | State |
| 2026-03-03 | COASTAL FOREST PRODUCTS LLC | CHAPMAN, Butler, AL | Pass | State |
| 2026-03-03 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BILLINGSLEY, Autauga, AL | Pass | State |
| 2026-03-03 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BILLINGSLEY, Autauga, AL | Pass | State |
| 2026-03-03 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-03 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | ROCKFORD, Coosa, AL | Pass | State |
| 2026-03-03 | STEEL DUST RECYCLING LLC | MILLPORT, Lamar, AL | Pass | State |
| 2026-03-03 | SSAB ALABAMA INC | AXIS, Mobile, AL | Pass | State |
| 2026-03-03 | NUCOR STEEL DECATUR LLC | TRINITY, Morgan, AL | Pass | State |
| 2026-03-03 | DESOTO GATHERING COMPANY, LLC - SOUTH RAINBOW CPF-4 | CENTER RIDGE, Conway, AR | Pass | State |
| 2026-03-03 | DESOTO GATHEIRNG COMPANY, LLC - GRAVEL HILL CPF-2 | CLEVELAND (HISTORICAL), TOWNSHIP OF, Van Buren, AR | Pass | State |
| 2026-03-03 | EL PASO NATURAL GAS - WILLCOX COMPRESSOR STATION | WILLCOX, Cochise, AZ | Pass | State |
| 2026-03-03 | LA CNTY SANITATION DISTRICT-PUENTE HILLS | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2026-03-03 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-03 | OWENS BROCKWAY GLASS | TRACY, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | ALTAGAS RIPON ENERGY INC | RIPON, San Joaquin, CA | Pass | Local |
| 2026-03-03 | BALL METAL BEVERAGE CONTAINER CORP | GOLDEN AREA, Jefferson, CO | Pass | State |
| 2026-03-03 | BREVARD CO BOARD OF COUNTY COMMISSIONERS | COCOA, Brevard, FL | Pass | State |
| 2026-03-03 | BREVARD CO BOARD OF COUNTY COMMISSIONERS | COCOA, Brevard, FL | Pass | State |
| 2026-03-03 | BREVARD CO BOARD OF COUNTY COMMISSIONERS | COCOA, Brevard, FL | Pass | State |
| 2026-03-03 | BREVARD CO BOARD OF COUNTY COMMISSIONERS | COCOA, Brevard, FL | Pass | State |
| 2026-03-03 | BREVARD CO BOARD OF COUNTY COMMISSIONERS | COCOA, Brevard, FL | Pass | State |
| 2026-03-03 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-03 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-03 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-03 | WHITE SPRINGS AGRICULTURAL CHEMICALS,INC | WHITE SPRINGS, Hamilton, FL | Pass | State |
| 2026-03-03 | CF INDUSTRIES NITROGEN LLC - PORT NEAL NITROGEN COMPLEX — high-priority violation on file | SERGEANT BLUFF, Woodbury, IA | Pass | State |
| 2026-03-03 | MERRILL IRON AND STEEL | CAMANCHE, Clinton, IA | Pass | State |
| 2026-03-03 | ADM CORN PROCESSING | CEDAR RAPIDS, Linn, IA | Pass | Local |
| 2026-03-03 | PREMIER LLC 00706 | EAGLE, Ada, ID | Pass | State |
| 2026-03-03 | HOLCIM (US) INC | GRAND CHAIN, Massac, IL | Pass | State |
| 2026-03-03 | HOLCIM (US) INC | GRAND CHAIN, Massac, IL | Pass | State |
| 2026-03-03 | HOLCIM (US) INC | GRAND CHAIN, Massac, IL | Pass | State |
| 2026-03-03 | ADM GRAIN COMPANY LOGANSPORT TERMINAL | LOGANSPORT, Cass, IN | Pass | State |
| 2026-03-03 | W R GRACE & CO-CONN - LAKE CHARLES FACILITY | SULPHUR, Calcasieu, LA | Pass | State |
| 2026-03-03 | STONY BROOK ENERGY CENTER — high-priority violation on file | LUDLOW, TOWN OF, Hampden, MA | Pending | State |
| 2026-03-03 | STONY BROOK ENERGY CENTER — high-priority violation on file | LUDLOW, TOWN OF, Hampden, MA | Pending | State |
| 2026-03-03 | DTE ELECTRIC COMPANY - MONROE POWER PLANT | MONROE, Monroe, MI | Pass | State |
| 2026-03-03 | SOUTHERN MINNESOTA MUNICIPAL POWER AGENCY FAIRMONT ENERGY STATION | FAIRMONT, Martin, MN | Pass | State |
| 2026-03-03 | KODA ENERGY, LLC — high-priority violation on file | SHAKOPEE, Scott, MN | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pending | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
| 2026-03-03 | CAPITAL QUARRIES CO. INC (PORT-0930) | PORTABLE, Undetermined, MO | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.