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 |
|---|---|---|---|---|
| 2026-01-21 | MONARCH CEMENT (AIR) | HUMBOLDT, Allen, KS | Pass | State |
| 2026-01-21 | WHEELABRATOR NORTH ANDOVER INCORPORATED | NORTH ANDOVER, TOWN OF, Essex, MA | Pending | State |
| 2026-01-21 | W. R. GRACE & CO. - CONN. | CURTIS BAY, Baltimore (city), MD | Pass | State |
| 2026-01-21 | SUMPTER ENERGY ASSOCIATES, LLC | LENOX TOWNSHIP, Macomb, MI | Pass | State |
| 2026-01-21 | CHEMOURS COMPANY - FAYETTEVILLE WORKS | FAYETTEVILLE, Bladen, NC | Pending | State |
| 2026-01-21 | NUCOR STEEL LEXINGTON | LEXINGTON, Davidson, NC | Pending | State |
| 2026-01-21 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-01-21 | CLARIOS | KERNERSVILLE, Forsyth, NC | Pass | Local |
| 2026-01-21 | HF SINCLAIR NAVAJO REFINING LLC (ARTESIA) — high-priority violation on file | ARTESIA, Eddy, NM | Pass | State |
| 2026-01-21 | BOUNDS COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-01-21 | BOUNDS COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2026-01-21 | JANIE CONNER FACILITY — high-priority violation on file | MALAGA, Eddy, NM | Pass | State |
| 2026-01-21 | ENTERPRISE - OXY SAND DUNES CENTRAL COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-01-21 | WHITE CITY ROAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2026-01-21 | ZIA II GAS PLANT | LOCO HILLS, Lea, NM | Pass | State |
| 2026-01-21 | ZIA II GAS PLANT | LOCO HILLS, Lea, NM | Pass | State |
| 2026-01-21 | ACHILLES COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-21 | ACHILLES COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-01-21 | EOG RESOURCES, INC. - VANFOSSEN CR AUG PAD | AUGUSTA, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-01-21 | EOG RESOURCES, INC. - VANFOSSEN CR AUG PAD | AUGUSTA, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-01-21 | EOG RESOURCES, INC. - VANFOSSEN CR AUG PAD | AUGUSTA, TOWNSHIP OF, Carroll, OH | Pass | State |
| 2026-01-21 | DAISY BRAND LLC | WOOSTER, Wayne, OH | Pass | State |
| 2026-01-21 | DAISY BRAND LLC | WOOSTER, Wayne, OH | Pass | State |
| 2026-01-21 | DAISY BRAND LLC | WOOSTER, Wayne, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | CONCRETE SEALANTS, INC. | TIPP CITY, Miami, OH | Pass | State |
| 2026-01-21 | GEISINGER MED CTR/DANVILLE | DANVILLE, Montour, PA | Pass | State |
| 2026-01-21 | EQM GATHERING OPCO LLC/PIPERS RIDGE INTERCONNECT | WAYNESBURG, Greene, PA | Pass | State |
| 2026-01-21 | VONORE FIBER PRODUCTS LLC — high-priority violation on file | VONORE, Monroe, TN | Incomplete | State |
| 2026-01-21 | COLOSSUS DATA CENTER | MEMPHIS, Shelby, TN | Pass | Local |
| 2026-01-21 | COLUMBIA GAS TRANSMISSION CORP EMPORIA | GREENSVILLE, Greensville, VA | Pass | State |
| 2026-01-21 | WESTROCK LONGVIEW LLC — high-priority violation on file | LONGVIEW, Cowlitz, WA | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | HEAT PLANT (UNIVERSITY OF WYOMING) | LARAMIE, Albany, WY | Pass | State |
| 2026-01-21 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-01-21 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-01-21 | TABLE MOUNTAIN - CHAIR COMPRESSOR STATION (PRONGHORN MIDSTREAM LLC) | JOHNSON COUNTY, Johnson, WY | Pass | State |
| 2026-01-20 | WESTROCK COMPANY, LLC | STEVENSON, Jackson, AL | Pass | State |
| 2026-01-20 | AM/NS CALVERT LLC | CALVERT, Mobile, AL | Pass | State |
| 2026-01-20 | CONTAINER LIFE CYCLE MANAGEMENT, LLC | ARKADELPHIA, Clark, AR | Pass | State |
| 2026-01-20 | ET GATHERING & PROCESSING LLC. - FEDERAL COMPRESSOR STATION | GREENWOOD, Sebastian, AR | Pass | State |
| 2026-01-20 | ET GATHERING & PROCESSING LLC. - HINKLE COMPRESSOR STATION | GREENWOOD, Sebastian, AR | Pass | State |
| 2026-01-20 | DESOTO GATHEIRNG COMPANY, LLC - GRAVEL HILL CPF-2 | CLEVELAND (HISTORICAL), TOWNSHIP OF, Van Buren, AR | Pass | State |
| 2026-01-20 | DESOTO GATHERING COMPANY, LLC - YOGI CPF-2 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-01-20 | BRIDGE ENERGY, LLC | BREA, Orange, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | ALTAGAS SAN JOAQUIN ENERGY INC | TRACY, San Joaquin, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | CALIFORNIA DAIRIES, INC. — high-priority violation on file | TURLOCK, Stanislaus, CA | Pass | Local |
| 2026-01-20 | PDC ENERGY, INC. - GOLDEN EAGLE HZ | SEVERANCE AREA, Weld, CO | N/A | State |
| 2026-01-20 | GEORGETOWN UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Incomplete | State |
| 2026-01-20 | PEACE RIVER CITRUS PRODUCTS | ARCADIA, DeSoto, FL | Pass | State |
| 2026-01-20 | BOISE CASCADE WOOD PRODUCTS, LLC | HAVANA, Gadsden, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | REWORLDLAKE II, INC. | OKAHUMPKA, Lake, FL | Pass | State |
| 2026-01-20 | FLORIDA MUNICIPAL POWER AGENCY | FORT PIERCE, St. Lucie, FL | Pass | State |
| 2026-01-20 | FLORIDA MUNICIPAL POWER AGENCY | FORT PIERCE, St. Lucie, FL | Pass | State |
| 2026-01-20 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-20 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-20 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-20 | WASHINGTON COUNTY ENERGY FACILITY | SANDERSVILLE, Washington, GA | Pass | State |
| 2026-01-20 | PAR - REFINERY — high-priority violation on file | KAPOLEI, Honolulu, HI | Pass | State |
| 2026-01-20 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-01-20 | MTBT - MARSHALLTOWN | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2026-01-20 | HICKORY RIDGE LANDFILL INC | BAYLIS, Pike, IL | Pass | State |
| 2026-01-20 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-20 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-20 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-20 | WHITEWATER MILL LLC — high-priority violation on file | WEST HARRISON, Dearborn, IN | Pass | State |
| 2026-01-20 | CARGILL INC — high-priority violation on file | HAMMOND, Lake, IN | Pass | State |
| 2026-01-20 | TATE & LYLE SOLUTIONS USA LLC — high-priority violation on file | LAFAYETTE, Tippecanoe, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.