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 |
|---|---|---|---|---|
| 2026-05-12 | DESOTO GATHERING COMPANY, LLC - MIDGE CPF-2 | PANGBURN, White, AR | Pass | State |
| 2026-05-12 | DESOTO GATHERING COMPANY, LLC - TIGER CPF 2 | JUDSONIA, White, AR | Pass | State |
| 2026-05-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-05-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-05-12 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2026-05-12 | SANTA CRUZ COUNTY PUBLIC WORKS-BUENA VISTA | WATSONVILLE, Santa Cruz, CA | Pass | Local |
| 2026-05-12 | SANTA CRUZ COUNTY PUBLIC WORKS-BUENA VISTA | WATSONVILLE, Santa Cruz, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | LODI GAS STORAGE LLC | ACAMPO, San Joaquin, CA | Pass | Local |
| 2026-05-12 | VRSD OXNARD LANDFILLS | OXNARD, Ventura, CA | Pass | Local |
| 2026-05-12 | QB ENERGY OPERATING - O29 596 SWD | PARACHUTE 10.4 MI. NW OF, Garfield, CO | Pass | State |
| 2026-05-12 | LARAMIE ENERGY - HAWXHURST RANCH | COLLBRAN AREA, Mesa, CO | Pass | State |
| 2026-05-12 | BIMBO BAKERIES USA, INC. | GREENWICH, Fairfield, CT | Pass | State |
| 2026-05-12 | WHEELABRATOR BRIDGEPORT LP | BRIDGEPORT, Fairfield, CT | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | PINELLAS CO. BOARD OF CO. COMMISSIONERS | SAINT PETERSBURG, Pinellas, FL | Pass | State |
| 2026-05-12 | TRANSCO COMPRESSOR STATION 116 | WHITESBURG, Carroll, GA | Pass | State |
| 2026-05-12 | TRANSCO COMPRESSOR STATION 116 | WHITESBURG, Carroll, GA | Pass | State |
| 2026-05-12 | TRANSCO COMPRESSOR STATION 116 | WHITESBURG, Carroll, GA | Pass | State |
| 2026-05-12 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-12 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-12 | FLOYD COUNTY WALKER MOUNTAIN LANDFILL | ROME, Floyd, GA | Pass | State |
| 2026-05-12 | GIRO PACK, INC. — high-priority violation on file | VIDALIA, Toombs, GA | Pass | State |
| 2026-05-12 | GIRO PACK, INC. — high-priority violation on file | VIDALIA, Toombs, GA | Pass | State |
| 2026-05-12 | LAKE PARK MUNICIPAL UTILITIES | LAKE PARK, Dickinson, IA | Pass | State |
| 2026-05-12 | LAKE PARK MUNICIPAL UTILITIES | LAKE PARK, Dickinson, IA | Pass | State |
| 2026-05-12 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | GRAIN PROCESSING CORP — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2026-05-12 | HK CONTRACTORS INC 00079 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | HK CONTRACTORS INC 00121 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | HK CONTRACTORS INC 00168 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | HK CONTRACTORS 00413 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | HK CONTRACTORS INC 00463 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | HK CONTRACTORS INC 00480 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | HK CONTRACTORS 00495 | IDAHO FALLS, Bonneville, ID | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | GENERAL MOTORS LLC FORT WAYNE ASSEMBLY — high-priority violation on file | ROANOKE, Huntington, IN | Pass | State |
| 2026-05-12 | MAC CONSTRUCTION & EXCAVATING INC | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2026-05-12 | MAC CONSTRUCTION & EXCAVATING INC | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2026-05-12 | MAC CONSTRUCTION & EXCAVATING INC | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2026-05-12 | MAC CONSTRUCTION & EXCAVATING INC | JEFFERSONVILLE, Clark, IN | Pass | State |
| 2026-05-12 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2026-05-12 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2026-05-12 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2026-05-12 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2026-05-12 | STEEL DYNAMICS, INC. FLAT ROLL GROUP, BUTLER DIVISION — high-priority violation on file | BUTLER, DeKalb, IN | Pass | State |
| 2026-05-12 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-12 | BP PRODUCTS NORTH AMERICA INC WHITING BUSINESS UNIT — high-priority violation on file | WHITING, Lake, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
| 2026-05-12 | HEIDELBERG MATERIALS MIDWEST AGG INCORPORATED HARDING ST QUA | INDIANAPOLIS, Marion, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.