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 |
|---|---|---|---|---|
| 2026-01-06 | 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 | ARMED FORCES RETIREMENT HOME — high-priority violation on file | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-01-06 | GALLAUDET UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Incomplete | State |
| 2026-01-06 | TRANSCONTINENTAL GAS PIPELINE COMPANY, LLC - COMPRESSOR STATION 130 | COMER, Madison, GA | Pass | State |
| 2026-01-06 | TRANSCONTINENTAL GAS PIPELINE COMPANY, LLC - COMPRESSOR STATION 130 | COMER, Madison, GA | Pass | State |
| 2026-01-06 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-06 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-06 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-06 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-06 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-06 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-01-06 | GOLDEN GRAIN ENERGY LLC — high-priority violation on file | MASON CITY, Cerro Gordo, IA | Pass | State |
| 2026-01-06 | CARGILL INC-IOWA FALLS | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-01-06 | STINE ATP — high-priority violation on file | REDFIELD, Dallas, IA | Fail | State |
| 2026-01-06 | ALCOA POWER GENERATING INC WARRICK POWER PLANT — high-priority violation on file | NEWBURGH, Warrick, IN | Pass | State |
| 2026-01-06 | STEEL DYNAMICS, INC. STRUCTURAL & RAIL DIVISION — high-priority violation on file | COLUMBIA CITY, Whitley, IN | Pass | State |
| 2026-01-06 | EVERGY, INC. - JEFFREY ENERGY CENTER (AIR) | ST. MARY'S, Pottawatomie, KS | Pass | State |
| 2026-01-06 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2026-01-06 | MAGNOLIA MIDSTREAM GAS SERVICES LLC - SPRING RIDGE NORTH CENTRAL FACILITY | SPRING RIDGE, Caddo, LA | Pass | State |
| 2026-01-06 | RAIN CII CARBON LLC - NORCO COKE CALCINING PLANT | NORCO, St. Charles, LA | Pass | State |
| 2026-01-06 | MINNESOTA SOYBEAN PROCESSORS | BREWSTER, Nobles, MN | Pass | State |
| 2026-01-06 | XCEL ENERGY - SHERBURNE COUNTY GENERATING PLANT | BECKER, Sherburne, MN | Pass | State |
| 2026-01-06 | CALUMET MONTANA REFINING — high-priority violation on file | GREAT FALLS, Cascade, MT | Pass | State |
| 2026-01-06 | BAINVILLE STATION | BAINVILLE, Roosevelt, MT | Pass | State |
| 2026-01-06 | AMERICAN CRYSTAL SUGAR COMPANY (ACS) - HILLSBORO PLANT - AQ | HILLSBORO, Traill, ND | Pass | State |
| 2026-01-06 | BRANTLEY COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-01-06 | BRANTLEY COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-01-06 | RAY STATE SLOT 3 FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-01-06 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-06 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-06 | THISTLE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-06 | THISTLE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-06 | LEA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-01-06 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-06 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-06 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-06 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-06 | RATTLESNAKE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-06 | RATTLESNAKE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-06 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-01-06 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Fail | Local |
| 2026-01-06 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-01-06 | VERTIV CORPORATION | DELAWARE, Delaware, OH | Pass | State |
| 2026-01-06 | ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS | PHILO, Muskingum, OH | Pass | State |
| 2026-01-06 | ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS | PHILO, Muskingum, OH | Pass | State |
| 2026-01-06 | ROCKIES EXPRESS PIPELINE LLC- CHANDLERSVILLE CS | PHILO, Muskingum, OH | Pass | State |
| 2026-01-06 | EOG RESOURCES INC - GEMSBOK CTB | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-01-06 | EOG RESOURCES INC - GEMSBOK CTB | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-01-06 | EOG RESOURCES INC - GEMSBOK CTB | BELLE VALLEY, Noble, OH | Pass | State |
| 2026-01-06 | PERRYMAN CO/TITANIUM CONVERSION FAC — high-priority violation on file | HOUSTON, Washington, PA | Pass | State |
| 2026-01-06 | NFG MIDSTREAM COVINGTON LLC/LAWTON COMP STA | WELLSBORO, Tioga, PA | Pass | State |
| 2026-01-06 | EQM GATHERING OPCO LLC/IO COMP STA | WAYNESBURG, Greene, PA | Pass | State |
| 2026-01-06 | WILLIAMS FIELD SVC CO LLC/WHITE COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2026-01-06 | CAROLINA GAS TRANSMISSION LLC - MOORE COMPRESSOR STATION | MOORE, Spartanburg, SC | Pass | State |
| 2026-01-06 | TRANS-JORDAN CITIES LANDFILL | SOUTH JORDAN, Salt Lake, UT | Pass | State |
| 2026-01-06 | WALMART SUPERCENTER #4623 | NEWPORT NEWS, Newport News (city), VA | Pass | State |
| 2026-01-06 | SILGAN CONTAINERS MFG CORP - PLOVER — high-priority violation on file | PLOVER, Price, WI | Pass | State |
| 2026-01-06 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-06 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-06 | HILIGHT GAS PLANT (WES POWDER RIVER HOLDINGS LLC) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-06 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-01-05 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2026-01-05 | DESOTO GATHERING COMPANY, LLC - GRAVEL HILL CPF-4 | SCOTLAND, Van Buren, AR | Pass | State |
| 2026-01-05 | CITY OF BEEBE | BEEBEE, White, AR | Pass | State |
| 2026-01-05 | SO CAL EDISON CO | AVALON, Los Angeles, CA | Pass | Local |
| 2026-01-05 | CARGILL INC-IOWA FALLS | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-01-05 | CF INDUSTRIES NITROGEN LLC - DONALDSONVILLE NITROGEN COMPLEX | DONALDSONVILLE, Ascension, LA | Pass | State |
| 2026-01-05 | WARD FP 18-13-12 ALT PAD | MANSFIELD, De Soto, LA | Pass | State |
| 2026-01-05 | ERVING PAPER MILLS | ERVING, Franklin, MA | Pending | State |
| 2026-01-05 | CENTERPOINT ENERGY JANE COMPRESSOR STATION | NOEL, McDonald, MO | Pass | State |
| 2026-01-05 | BRANTLEY COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-01-05 | BRANTLEY COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-01-05 | ARAPAHOE PARK COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-01-05 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-05 | SECTION 9 COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-05 | PIRATE STATE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-05 | LEA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-01-05 | LEA COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2026-01-05 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-05 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-05 | MARKWEST - BELL LAKE NORTH COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-01-05 | DAGGER ST (NW) TB | MONUMENT, Lea, NM | Pass | State |
| 2026-01-05 | RATTLESNAKE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-05 | RATTLESNAKE COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-05 | GREYLOCK MIDSTREAM LLC/CUMBERLAND HENDERSON COMP STA | CARMICHAELS, Greene, PA | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.