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 |
|---|---|---|---|---|
| 2025-12-16 | NE RENEWABLE POWER WEST ENFIELD, LLC | WEST ENFIELD, Penobscot, ME | Pass | State |
| 2025-12-16 | NORTHERN NATURAL GAS - FARMINGTON | FARMINGTON, Dakota, MN | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-16 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2025-12-16 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2025-12-16 | BAKKEN GATHERING PLANT | SIDNEY, Richland, MT | Pass | State |
| 2025-12-16 | WYETH, LLC | SANFORD, Lee, NC | Pass | State |
| 2025-12-16 | ADM CORN PROCESSING — high-priority violation on file | COLUMBUS, Platte, NE | N/A | State |
| 2025-12-16 | ADM CORN PROCESSING — high-priority violation on file | COLUMBUS, Platte, NE | Pass | State |
| 2025-12-16 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-16 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-16 | ALYSON TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-16 | EOG - ODIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-12-16 | EOG - ODIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-12-16 | WOOL HEAD PAD A BATTERY | MONUMENT, Lea, NM | Pass | State |
| 2025-12-16 | NINA CORTEL COMPRESSOR STATION | MONUMENT, Lea, NM | Pass | State |
| 2025-12-16 | HOGNOSE VIPER 23 CTB 1 | EUNICE, Lea, NM | Pass | State |
| 2025-12-16 | HOGNOSE VIPER 23 CTB 1 | EUNICE, Lea, NM | Pass | State |
| 2025-12-16 | RHEA LGL STATION | MALAGA, Lea, NM | Pass | State |
| 2025-12-16 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-16 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-16 | FAB 8 | MALTA, Saratoga, NY | Pass | State |
| 2025-12-16 | SAMUEL A CARLSON GENERATING STATION | JAMESTOWN, Chautauqua, NY | Pass | State |
| 2025-12-16 | PEPPERIDGE FARM INC. | WILLARD, Huron, OH | Fail | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | GULFPORT APPALACHIA, LLC - SUNSET WELL PAD | MARTINS FERRY, Belmont, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - ZIMNOX WLS JF | MINGO JUNCTION, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | ASCENT RESOURCES - UTICA LLC - DOYEN WEL JF | RAYLAND, Jefferson, OH | Pass | State |
| 2025-12-16 | INTERNATIONAL PAPER | SPRINGFIELD, Lane, OR | N/A | Local |
| 2025-12-16 | EASTERN GAS TRANS & STORAGE/CRAYNE STA | WAYNESBURG, Greene, PA | Pass | State |
| 2025-12-16 | MTN GATHERING LLC/DRY RUN COMP STA | CHAPMAN, Clinton, PA | Pass | State |
| 2025-12-16 | PIN OAK MIDSTREAM LLC/JACKSON CTR COMP STA | JACKSON CENTER, Mercer, PA | Pass | State |
| 2025-12-16 | ELKHORN GAS PROC LLC/KANE PLT | KANE, McKean, PA | Pass | State |
| 2025-12-16 | REGENCY MARCELLUS GAS GATHERING LLC/ AUBURN STA | MESHOPPEN, Susquehanna, PA | Pass | State |
| 2025-12-16 | PA TURNPIKE COMM/AKH MAINT FAC | JEANNETTE, Westmoreland, PA | Pass | State |
| 2025-12-16 | DORCHESTER BIOMASS LLC | HARLEYVILLE, Dorchester, SC | Pass | State |
| 2025-12-16 | THERMAL KEM GENERATING FACILITY | ROCK HILL, York, SC | Pass | State |
| 2025-12-16 | LINHART CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2025-12-16 | LINHART CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2025-12-16 | LINHART CENTRAL FACILITY | KARNES CITY, Karnes, TX | Pass | State |
| 2025-12-16 | KENNECOTT MAIN STACK, SMELTER AND | BINGHAM CANYON, Salt Lake, UT | Pass | State |
| 2025-12-16 | PACKAGING CORPORATION OF AMERICA — high-priority violation on file | WALLULA, Walla Walla, WA | Fail | State |
| 2025-12-16 | JENNIE-O TURKEY STORE INC. | BARRON, Barron, WI | Pass | State |
| 2025-12-16 | APPALACHIAN POWER COMPANY, JOHN AMOS PLANT | WINFIELD, Putnam, WV | Pass | State |
| 2025-12-16 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-12-16 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-12-16 | LARAMIE RIVER STATION (BASIN ELECTRIC POWER COOPERATIVE) — high-priority violation on file | WHEATLAND, Platte, WY | Pass | State |
| 2025-12-16 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-16 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-16 | CHAIN LAKES I5 35 4H-8H PAD (CROWHEART ENERGY, LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-12-15 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2025-12-15 | INTERNATIONAL PAPER | PINE HILL, Wilcox, AL | Pass | State |
| 2025-12-15 | RAZORBACK GATHERING COMPANY, LLC. - POINT REMOVE CPF 1 | SOLGOHACHIA, Conway, AR | Pass | State |
| 2025-12-15 | RAZORBACK GATHERING COMPANY, LLC. - POINT REMOVE CPF 1 | SOLGOHACHIA, Conway, AR | Pass | State |
| 2025-12-15 | SO CAL GAS CO/PLAYA DEL REY STORAGE | PLAYA DEL REY, Los Angeles, CA | Pass | Local |
| 2025-12-15 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-15 | REP PROCESSING - SEVERANCE COMP STATION | AULT AREA, Weld, CO | Pass | State |
| 2025-12-15 | HARRISON STEEL CASTINGS COMPANY — high-priority violation on file | ATTICA, Fountain, IN | Pass | State |
| 2025-12-15 | SHINTECH LOUISIANA LLC - SHINTECH PLAQUEMINE PLANT | PLAQUEMINE, Iberville, LA | Pass | State |
| 2025-12-15 | SHINTECH LOUISIANA LLC - SHINTECH PLAQUEMINE PLANT | PLAQUEMINE, Iberville, LA | Pass | State |
| 2025-12-15 | WASTE MANAGEMENT DISPOSAL SERVICES OF MAINE, INC. — high-priority violation on file | NORRIDGEWOCK, Somerset, ME | Pass | State |
| 2025-12-15 | WASTE MANAGEMENT DISPOSAL SERVICES OF MAINE, INC. — high-priority violation on file | NORRIDGEWOCK, Somerset, ME | Pass | State |
| 2025-12-15 | WASTE MANAGEMENT DISPOSAL SERVICES OF MAINE, INC. — high-priority violation on file | NORRIDGEWOCK, Somerset, ME | Pass | State |
| 2025-12-15 | HEARTLAND CORN PRODUCTS | WINTHROP, Sibley, MN | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | AMAZON DATA SERVICES INC, MADISON MEGA SITE — high-priority violation on file | CANTON, Madison, MS | Pass | State |
| 2025-12-15 | SOUTH CARLSBAD COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-15 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-15 | WILLOW LAKE GAS PROCESSING PLANT | MALAGA, Eddy, NM | Pass | State |
| 2025-12-15 | SIMON CAMAMILE SOUTH TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-12-15 | BEDROCK COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-12-15 | PONCHO COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-12-15 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-15 | PABCO GYPSUM | LAS VEGAS, Clark, NV | Pass | Local |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | ASCENT RESOURCES - UTICA LLC - DAWSON SMF JF WELLPAD | DILLONVALE, Jefferson, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
| 2025-12-15 | INR MIDSTREAM, LLC - UPPER HILL COMPRESSOR STATION | SARAHSVILLE, Noble, OH | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.
What this page shows
This page covers Clean Air Act facilities in the EPA air register and stack tests in 2025. It lists 26,291 stack tests recorded nationwide in 2025.