EPA Air · stack tests by year
Air-emissions stack tests in 2025
- 26,291Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit.
States, 2025
- California 5,390
- Ohio 2,213
- New Mexico 1,801
- Indiana 1,619
- Florida 1,419
- Wyoming 1,362
- Georgia 1,233
- Oklahoma 1,229
- Pennsylvania 951
- Missouri 768
- Alabama 693
- Mississippi 688
- Arkansas 619
- Iowa 500
- Colorado 405
- Michigan 387
- Texas 308
- North Carolina 275
- Illinois 264
- Washington 251
- Wisconsin 245
- Minnesota 238
- West Virginia 224
- Delaware 212
- South Carolina 210
- Kentucky 204
- Kansas 202
- Connecticut 178
- Utah 175
- Montana 174
- Virginia 170
- Tennessee 168
- Alaska 152
- Nebraska 145
- North Dakota 143
- Maine 131
- New York 124
- Louisiana 117
- Arizona 116
- Idaho 111
- Nevada 73
- New Hampshire 59
- Massachusetts 59
- Oregon 56
- Hawaii 53
- Maryland 51
- South Dakota 46
- Rhode Island 30
- District of Columbia 28
- Puerto Rico 14
- Vermont 4
- New Jersey 4
Other years
Air-emissions stack tests recorded in 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-09-09 | VALDEZ BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-09-09 | TEXANA COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-09-09 | JACKIE CENTRAL GATHERING FACILITY | MALAGA, Eddy, NM | Pass | State |
| 2025-09-09 | RICO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-09-09 | RICO COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-09-09 | BROOME COUNTY LFG RECOVERY FACILITY | NANTICOKE, Broome, NY | Pass | State |
| 2025-09-09 | TENNESSEE GAS PIPELINE CO COMPRESSOR STATION 230-C | LOCKPORT, Niagara, NY | Pass | State |
| 2025-09-09 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-09 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-09 | HERRICK PAD 952535 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-09 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-09 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-09 | WILEY PAD 952982 | WOODSFIELD, Monroe, OH | Pass | State |
| 2025-09-09 | MILL CREEK WWTP | CINCINNATI, Hamilton, OH | Pass | State |
| 2025-09-09 | BCE MACH III LLC / LSEOU 16 1HO LSEOU 17 4HO LSEOU 27 4HO | CRESCENT, Kingfisher, OK | Pass | State |
| 2025-09-09 | BCE MACH III LLC / LNU 59 5HO LNU 59 6HO LNU 60 5HO PAD | DOVER, Kingfisher, OK | Pass | State |
| 2025-09-09 | DCP OPERATING CO LP / SKIPPER COMPRESSOR STATION | FOSTER, Stephens, OK | Pass | State |
| 2025-09-09 | TARGA PIPELINE MIDCONTINENT LLC / KETCHUM RANCH COMPRESSOR STATION | VELMA, Stephens, OK | Pass | State |
| 2025-09-09 | TARGA PIPELINE MIDCONTINENT LLC / KETCHUM RANCH COMPRESSOR STATION | VELMA, Stephens, OK | Pass | State |
| 2025-09-09 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | FARRELL, Mercer, PA | Pass | State |
| 2025-09-09 | WILLIAMS FIELD SVC CO LLC/SHASKAS COMP STA | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-09-09 | NFG MIDSTREAM COVINGTON LLC/CLARK COMP STA | MAINESBURG, Tioga, PA | Pass | State |
| 2025-09-09 | EXPAND OPERATING LLC/NOWICKI PAD NR25 | SUSQUEHANNA, Susquehanna, PA | Pass | State |
| 2025-09-09 | PL DEVELOPMENTS LLC — high-priority violation on file | PIEDMONT, Greenville, SC | Pass | State |
| 2025-09-09 | BASIN ELECTRIC POWER COOPERATIVE GROTON GENERATING | GROTON, Brown, SD | Pass | State |
| 2025-09-09 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2025-09-09 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2025-09-09 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2025-09-09 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2025-09-09 | EAST 74 RANCH CENTRAL FACILITY | CAMPBELLTON, Atascosa, TX | Pass | State |
| 2025-09-09 | GLOBAL CELLULOSE FIBERS - FRANKLIN MILL | FRANKLIN, Isle of Wight, VA | Pass | State |
| 2025-09-09 | ADVANSIX RESINS AND CHEMICALS LLC - HOPEWELL PLANT — high-priority violation on file | HOPEWELL, Hopewell (city), VA | Pass | State |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-09-09 | CARLISLE CONSTRUCTION MATERIALS INCORPORATED | PUYALLUP, Pierce, WA | Pass | Local |
| 2025-09-09 | CARLISLE CONSTRUCTION MATERIALS INCORPORATED | PUYALLUP, Pierce, WA | Pass | Local |
| 2025-09-09 | GRAYMONT (WI) LLC — high-priority violation on file | SUPERIOR, Douglas, WI | Pass | State |
| 2025-09-09 | BROWNTOWN FOUNDRY LLC — high-priority violation on file | BROWNTOWN, Green, WI | Pass | State |
| 2025-09-09 | APPLETON GRP LLC — high-priority violation on file | SOUTH MILWAUKEE, Monroe, WI | Pass | State |
| 2025-09-09 | KOHLER CO - METALS PROCESSING COMPLEX | KOHLER, Taylor, WI | Pass | State |
| 2025-09-09 | NEIL SIMPSON COMPLEX (BLACK HILLS CORPORATION) | GILLETTE, Campbell, WY | Pass | State |
| 2025-09-09 | RINER STATION (SOUTHERN STAR CENTRAL GAS PIPELINE) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-09 | RINER STATION (SOUTHERN STAR CENTRAL GAS PIPELINE) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-09-08 | PHILLIPS 66 CO/LA REFINERY WILMINGTON — high-priority violation on file | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-08 | WALNUT CREEK ENERGY, LLC | CITY OF INDUSTRY, Los Angeles, CA | Pass | Local |
| 2025-09-08 | DCP OPERATING CO - CROSSROADS FACILITY | KERSEY 5.0 MI. N OF, Weld, CO | Pass | State |
| 2025-09-08 | DCP OPERATING CO - CROSSROADS FACILITY | KERSEY 5.0 MI. N OF, Weld, CO | Pass | State |
| 2025-09-08 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-08 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-08 | CITY OF WAMEGO PUBLIC WORKS (AIR CURT COMB)(AIR) | WAMEGO, Pottawatomie, KS | Pass | State |
| 2025-09-08 | KY UTILITIES CO - GHENT STATION | GHENT, Carroll, KY | Pass | State |
| 2025-09-08 | MWRA DEER ISLAND | BOSTON, CITY OF, Suffolk, MA | Pass | State |
| 2025-09-08 | UNITED TACONITE LLC - THUNDERBIRD MINE | EVELETH, St. Louis, MN | Pass | State |
| 2025-09-08 | BRIDGEPORT ETHANOL LLC | BRIDGEPORT, Morrill, NE | Pass | State |
| 2025-09-08 | WHITEHORN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-08 | WHITEHORN COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-09-08 | VALDEZ BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-09-08 | VALDEZ BOOSTER STATION | LOVING, Eddy, NM | Pass | State |
| 2025-09-08 | CAVERN COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-09-08 | PADUCA BREAKS CENTRAL GATHERING FACILITY | JAL, Lea, NM | Pass | State |
| 2025-09-08 | PADUCA BREAKS CENTRAL GATHERING FACILITY | JAL, Lea, NM | Pass | State |
| 2025-09-08 | SEVERUS COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-09-08 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RICHARD STALDER PAD 952766 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | RIGGENBACH PAD 952771 | SARDIS, Monroe, OH | Pass | State |
| 2025-09-08 | DCP OPERATING CO LP / TRAMMELL BOOSTER STATION | HAMMON, Roger Mills, OK | Pass | State |
| 2025-09-08 | DCP OPERATING CO LP / SKIPPER COMPRESSOR STATION | FOSTER, Stephens, OK | Pass | State |
| 2025-09-08 | DCP OPERATING CO LP / SKIPPER COMPRESSOR STATION | FOSTER, Stephens, OK | Pass | State |
| 2025-09-08 | TARGA PIPELINE MIDCONTINENT LLC / KETCHUM RANCH COMPRESSOR STATION | VELMA, Stephens, OK | Pass | State |
| 2025-09-08 | TARGA PIPELINE MIDCONTINENT LLC / KETCHUM RANCH COMPRESSOR STATION | VELMA, Stephens, OK | Pass | State |
| 2025-09-08 | NLMK PENNSYLVANIA LLC/FARRELL PLT — high-priority violation on file | FARRELL, Mercer, PA | Pending | State |
| 2025-09-08 | WESTMORELAND SANITARY LDFL LLC/BELLE VERNON — high-priority violation on file | BELLE VERNON, Westmoreland, PA | Pass | State |
| 2025-09-08 | MARKWEST LIBERTY MID & RES / HOSKINS BOOSTER COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-09-08 | HEP PENNSYLVANIA GATHERING LLC/WHITE CPF 1 COMP STA | STEVENSVILLE, Bradford, PA | Pass | State |
| 2025-09-08 | SANTEE COOPER WINYAH GENERATING STATION | GEORGETOWN, Georgetown, SC | Pass | State |
| 2025-09-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-09-06 | MARKWEST OKLAHOMA GAS CO LLC / DAVID BOWERS COMPRESSOR STATION | SWEETWATER, Beckham, OK | Pass | State |
| 2025-09-05 | HILCORP ALASKA, LLC / CENTRAL GAS FACILITY (CGF) — high-priority violation on file | NORTH SLOPE BOROUGH, North Slope, AK | Pass | State |
| 2025-09-05 | HONDA MANUFACTURING OF ALABAMA LLC | LINCOLN, Talladega, AL | Pass | State |
| 2025-09-05 | RICHARD BAUGHN CONSTRUCTION, INC. | WALNUT RIDGE, Lawrence, AR | Pass | State |
| 2025-09-05 | LA CITY, DWP HARBOR GENERATING STATION | WILMINGTON, Los Angeles, CA | Pass | Local |
| 2025-09-05 | ATLANTA GAS LIGHT COMPANY - RIVERDALE LNG PLANT — high-priority violation on file | RIVERDALE, Clayton, GA | Pass | State |
| 2025-09-05 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-05 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-05 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-05 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-09-05 | KINDER MORGAN LIQUID TERMINALS LP | SUMMIT, Cook, IL | Pass | State |
| 2025-09-05 | RYOBI DIE CASTING USA INC — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.