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 |
|---|---|---|---|---|
| 2025-10-15 | CHEMOURS COMPANY FC LLC THE, DELISLE PLANT | PASS CHRISTI, Harrison, MS | Pass | State |
| 2025-10-15 | 3M PITTSBORO - INDUSTRIAL MINERAL PRODUCTS | MONCURE, Chatham, NC | Pass | State |
| 2025-10-15 | JOHNSTON COUNTY LANDFILL | SMITHFIELD, Johnston, NC | Pending | State |
| 2025-10-15 | HESS TIOGA GAS PLANT LLC - TIOGA GAS PLANT - AQ | TIOGA, Williams, ND | Pass | State |
| 2025-10-15 | AQUEDUCT COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-10-15 | CAVERN COMPRESSOR STATION | WHITES CITY, Eddy, NM | Pass | State |
| 2025-10-15 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-15 | MILKY WAY COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-15 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-15 | THE DUDE PROCESSING PLANT — high-priority violation on file | MONUMENT, Lea, NM | Pass | State |
| 2025-10-15 | JOHN CALLAHAN TB | JAL, Lea, NM | Pass | State |
| 2025-10-15 | NYC DOT-HAMILTON AVE ASPHALT PLANT | BROOKLYN, Kings, NY | Fail | State |
| 2025-10-15 | ASCENT RESOURCES - UTICA LLC - HOWELL 33 SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-10-15 | ASCENT RESOURCES - UTICA LLC - HOWELL 33 SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-10-15 | ASCENT RESOURCES - UTICA LLC - HOWELL 33 SMF JF | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-10-15 | EUREKA MIDSTREAM - CAIN RIDGE COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-10-15 | EUREKA MIDSTREAM - CAIN RIDGE COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-10-15 | EUREKA MIDSTREAM - CAIN RIDGE COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-10-15 | EUREKA MIDSTREAM - CAIN RIDGE COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-10-15 | EUREKA MIDSTREAM - CAIN RIDGE COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-10-15 | EUREKA MIDSTREAM - CAIN RIDGE COMPRESSOR STATION | CLARINGTON, Monroe, OH | Pass | State |
| 2025-10-15 | CROWN CORK & SEAL - MASSILLON PLANT 42 | MASSILLON, Stark, OH | Pass | State |
| 2025-10-15 | PROCTER & GAMBLE PAPER PROD CO/MEHOOPANY | MEHOOPANY, Wyoming, PA | Pass | State |
| 2025-10-15 | HEIDELBERG MATERIALS US CEMENT LLC/EVANSVILLE CEMENT PLT & Q — high-priority violation on file | FLEETWOOD, Berks, PA | Pass | State |
| 2025-10-15 | GRAYMONT PA INC/PLEASANT GAP & CON-LIME & BELLEFONTE PLTS | BELLEFONTE, Centre, PA | Pass | State |
| 2025-10-15 | NFG MIDSTREAM COVINGTON LLC/STOCK 144 COMP STA | WELLSBORO, Tioga, PA | Pending | State |
| 2025-10-15 | UE-02102PA LLC/FED EX ALLENTOWN | ALLEN TWP, Northampton, PA | Pass | State |
| 2025-10-15 | UGI GIBRALTAR GATHERING LLC/GIBRALTAR COMP STA | CLAYSVILLE, Washington, PA | Pass | State |
| 2025-10-15 | CORBIN, J. PAD 1 | KINGSLEY, Susquehanna, PA | Pass | State |
| 2025-10-15 | BENEDIKT, K. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-15 | CAROLINA MOUNTAIN LAND SOLUTIONS LLC — high-priority violation on file | WEST UNION, Oconee, SC | Pass | State |
| 2025-10-15 | POET BIOREFINING - GROTON | GROTON, Brown, SD | Pass | State |
| 2025-10-15 | AB MAURI FOOD INC | MEMPHIS, Shelby, TN | Pass | Local |
| 2025-10-15 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-15 | DIGITAL REALTY (DIGITAL LOUDOUN 3 & 4, LLC) | ASHBURN, Loudoun, VA | Pass | State |
| 2025-10-15 | GUY BENNETT LUMBER | CLARKSTON, Asotin, WA | Pass | State |
| 2025-10-15 | SIERRA PACIFIC IND.- SKAGIT LUMBER | MOUNT VERNON, Skagit, WA | Pass | Local |
| 2025-10-15 | BP WEST COAST PRODUCTS LLC — high-priority violation on file | BLAINE, Whatcom, WA | Pass | Local |
| 2025-10-15 | SIERRA PACIFIC INDUSTRIES - SHELTON | SHELTON, Mason, WA | Pending | Local |
| 2025-10-15 | ANR PIPELINE CO - JANESVILLE COMPRESSOR | JANESVILLE, Rusk, WI | Pass | State |
| 2025-10-15 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-15 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-15 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-15 | HOUSE CREEK MAINLINE COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-15 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2025-10-15 | MUDDY CREEK STATION (KERN RIVER GAS TRANS) | LINCOLN COUNTY, Lincoln, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-15 | CASPER COMPRESSOR STATION (TALLGRASS INTERSTATE GAS TRANSMISSION) | NATRONA COUNTY, Natrona, WY | Pass | State |
| 2025-10-14 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-14 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-14 | WEST FRASER HUGULEY | HUGULEY, Chambers, AL | Pass | State |
| 2025-10-14 | ALABAMA POWER COMPANY | BUCKS, Mobile, AL | Pass | State |
| 2025-10-14 | HIGH-PURITY SILICON AMERICA CORPORATION | THEODORE, Mobile, AL | Pass | State |
| 2025-10-14 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-14 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-14 | RAZORBACK GATHERING COMPANY, LLC. - HARMONY CPF 1 | SEARCY, White, AR | Pass | State |
| 2025-10-14 | MONTEREY REGIONAL WASTE MGMT DIST | MARINA, Monterey, CA | Pass | Local |
| 2025-10-14 | PDC ENERGY - ORR STATE 40-36 PAD | GREELEY AREA, Weld, CO | Pass | State |
| 2025-10-14 | NOBLE ENERGY - NCLP PC AA04 AA06 ECONODE | GILL AREA, Weld, CO | Pass | State |
| 2025-10-14 | REWORLD BRISTOL, INC. | BRISTOL, Hartford, CT | Pass | State |
| 2025-10-14 | MOSAIC FERTILIZER, LLC | RIVERVIEW, Hillsborough, FL | Pass | State |
| 2025-10-14 | MOSAIC FERTILIZER, LLC | RIVERVIEW, Hillsborough, FL | Pass | State |
| 2025-10-14 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2025-10-14 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2025-10-14 | MAS GEORGIA LFG, LLC (OAK GROVE) | WINDER, Barrow, GA | Pass | State |
| 2025-10-14 | GERDAU AMERISTEEL US INC. | CARTERSVILLE, Bartow, GA | Pass | State |
| 2025-10-14 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-14 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-14 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-14 | BRUNSWICK CELLULOSE LLC | BRUNSWICK, Glynn, GA | Pass | State |
| 2025-10-14 | CHATTAHOOCHEE ENERGY FACILITY | FRANKLIN, Heard, GA | Pass | State |
| 2025-10-14 | CHATTAHOOCHEE ENERGY FACILITY | FRANKLIN, Heard, GA | Pass | State |
| 2025-10-14 | MECO - PALAAU | PALAAU, Maui, HI | Pass | State |
| 2025-10-14 | VILLISCA MUNICIPAL POWER PLANT | VILLISCA, Montgomery, IA | Pass | State |
| 2025-10-14 | VILLISCA MUNICIPAL POWER PLANT | VILLISCA, Montgomery, IA | Pass | State |
| 2025-10-14 | NORTH IDAHO ENERGY LOGS - HAUSER | HAUSER, Kootenai, ID | Pass | State |
| 2025-10-14 | ARGONNE NATIONAL LABORATORY | LEMONT, DuPage, IL | Pass | State |
| 2025-10-14 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-14 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-14 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-14 | ATLAS FOUNDRY COMPANY INC | MARION, Grant, IN | Pass | State |
| 2025-10-14 | LINDE ADVANCED MATERIAL TECHNOLOGIES INC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-14 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-14 | ECOBAT RESOURCES INDIANA LLC | INDIANAPOLIS, Marion, IN | Pass | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Pass | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
| 2025-10-14 | HILLS PET NUTRITION — high-priority violation on file | RICHMOND, Wayne, IN | Fail | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.