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.