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 |
|---|---|---|---|---|
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-07 | ANTELOPE HILLS COMPRESSOR STATION (EOG RESOURCES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2026-05-06 | OUTOKUMPU STAINLESS USA, LLC | CALVERT, Mobile, AL | Pass | State |
| 2026-05-06 | MERIT ENERGY COMPANY, LLC - MCMILLIAN CP | CLARKSVILLE, Johnson, AR | Pass | State |
| 2026-05-06 | NUCOR YAMATO STEEL COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-06 | NUCOR YAMATO STEEL COMPANY | BLYTHEVILLE, Mississippi, AR | Pass | State |
| 2026-05-06 | DESOTO GATHERING COMPANY, LLC - YELLOWSTONE CPF 1 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-05-06 | DESOTO GATHERING COMPANY, LLC - YELLOWSTONE CPF 1 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-05-06 | DESOTO GATHERING COMPANY, LLC - YELLOWSTONE CPF-3 | BEE BRANCH, Van Buren, AR | Pass | State |
| 2026-05-06 | MERIT ENERGY COMPANY, LLC - BLUE MOUNTAIN CP | WAVELAND, Yell, AR | Pass | State |
| 2026-05-06 | NEW HARQUAHALA GENERATING | MARICOPA COUNTY, Maricopa, AZ | Pending | Local |
| 2026-05-06 | SENTINEL PEAK RESOURCES CA LLC — high-priority violation on file | BAKERSFIELD, Kern, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | FRITO-LAY INC | MODESTO, Stanislaus, CA | Pass | Local |
| 2026-05-06 | PROCTER & GAMBLE PAPER PRODUCTS — high-priority violation on file | OXNARD, Ventura, CA | Pass | Local |
| 2026-05-06 | AMRIZE PORTLAND PLANT — high-priority violation on file | FLORENCE 3.8 MI. E OF, Fremont, CO | Pass | State |
| 2026-05-06 | ALLIED PRINTING SERVICES, INC | MANCHESTER, Hartford, CT | Pass | State |
| 2026-05-06 | GEORGE WASHINGTON UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Incomplete | State |
| 2026-05-06 | GEORGE WASHINGTON UNIVERSITY — high-priority violation on file | WASHINGTON, District of Columbia, DC | Pass | State |
| 2026-05-06 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-06 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-06 | DUPONT EXPERIMENTAL STATION | WILMINGTON, New Castle, DE | Pass | State |
| 2026-05-06 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-06 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-06 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-06 | VANDOLAH POWER COMPANY, LLC | WAUCHULA, Hardee, FL | Pass | State |
| 2026-05-06 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-05-06 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-05-06 | CEMEX CONSTRUCTION MATERIALS FLORIDA,LLC | BROOKSVILLE, Hernando, FL | Pass | State |
| 2026-05-06 | GULFSTREAM NATURAL GAS SYSTEM, L.L.C. | PALMETTO, Manatee, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | PASCO COUNTY | SHADY HILLS, Pasco, FL | Pass | State |
| 2026-05-06 | TAMPA ELECTRIC COMPANY | MULBERRY, Polk, FL | Pass | State |
| 2026-05-06 | TAMPA ELECTRIC COMPANY | MULBERRY, Polk, FL | Pass | State |
| 2026-05-06 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-06 | MOUNT VERNON MILLS | TRION, Chattooga, GA | Pass | State |
| 2026-05-06 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-05-06 | ATLANTA GAS LIGHT CO. — high-priority violation on file | BALL GROUND, Cherokee, GA | Pass | State |
| 2026-05-06 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2026-05-06 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-06 | POET BIOREFINING IOWA FALLS, LLC — high-priority violation on file | IOWA FALLS, Hardin, IA | Pass | State |
| 2026-05-06 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-06 | MAQUOKETA MUNICIPAL ELECTRIC UTILITY-N&S | MAQUOKETA (HISTORICAL), Jackson, IA | Pass | State |
| 2026-05-06 | CITIZENS GAS JOHNSTOWN COMPRESSOR STATION | WORTHINGTON, Greene, IN | Pass | State |
| 2026-05-06 | CITIZENS GAS JOHNSTOWN COMPRESSOR STATION | WORTHINGTON, Greene, IN | Pass | State |
| 2026-05-06 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-06 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-06 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-06 | UNITED STATES GYPSUM COMPANY | EAST SHOALS, Martin, IN | Pass | State |
| 2026-05-06 | AMERICAN SYNTHETIC RUBBER COMPANY — high-priority violation on file | LOUISVILLE, Jefferson, KY | Pass | Local |
| 2026-05-06 | GENERAL MOTORS LLC FLINT ASSEMBLY | FLINT, Genesee, MI | Pass | State |
| 2026-05-06 | ANR PIPELINE COMPANY - BRIDGMAN COMPRESSOR STATION | BRIDGMAN, Berrien, MI | Pass | State |
| 2026-05-06 | POET BIOREFINING - BINGHAM LAKE | BINGHAM LAKE, Cottonwood, MN | Pass | State |
| 2026-05-06 | OLDCASTLE INFRASTRUCTURE INC | HANCOCK, Stevens, MN | Pass | State |
| 2026-05-06 | EAGLE RIDGE LANDFILL | BOWLING GREEN, Pike, MO | Pending | State |
| 2026-05-06 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-06 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-06 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-06 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-06 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-06 | ENSTOR GAS, LLC, MISSISSIPPI HUB EXPANSION PROJECT — high-priority violation on file | MAGEE, Simpson, MS | Pass | State |
| 2026-05-06 | CAROLINA POULTRY POWER RG3, LLC | LAGRANGE (LENOIR,NC), Lenoir, NC | Pending | State |
| 2026-05-06 | CHIEF ETHANOL FUELS INC | HASTINGS, Adams, NE | N/A | State |
| 2026-05-06 | EMPIRE ABO CS | ARTESIA, Eddy, NM | Pass | State |
| 2026-05-06 | VONI WEST FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2026-05-06 | RIPPLE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-05-06 | RIPPLE COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2026-05-06 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-06 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-06 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-06 | HOLLYWOOD STAR CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2026-05-06 | GREYHOUND COMPRESSOR STATION | EUNICE, Lea, NM | Pass | State |
| 2026-05-06 | BULL RUN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-05-06 | BULL RUN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2026-05-06 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-05-06 | TITAN COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2026-05-06 | CHARLES LING NORTH TB | JAL, Lea, NM | Pass | State |
| 2026-05-06 | CHUCK LENZIE GENERATING STATION | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-05-06 | CHUCK LENZIE GENERATING STATION | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-05-06 | CHUCK LENZIE GENERATING STATION | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-05-06 | CHUCK LENZIE GENERATING STATION | LAS VEGAS, Clark, NV | Pass | Local |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
| 2026-05-06 | CARROLLTON COMPRESSOR FACILITY | CARROLLTON, Carroll, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.