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 |
|---|---|---|---|---|
| 2025-10-13 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-13 | EOG - ALADDIN COMPRESSOR STATION | JAL, Lea, NM | Pass | State |
| 2025-10-13 | PONY EXPRESS FED WEST TB | MONUMENT, Lea, NM | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | ASCENT RESOURCES - BEACON CDZ HR | CADIZ, Harrison, OH | Pass | State |
| 2025-10-13 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-10-13 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-10-13 | GEORGIA-PACIFIC WAUNA LLC — high-priority violation on file | CLATSKANIE, Clatsop, OR | Pass | State |
| 2025-10-13 | WILLIAMS FIELD SVC CO LLC/JONES COMP STA | FRIENDSVILLE, Susquehanna, PA | Pass | State |
| 2025-10-13 | REGENCY MARCELLUS GAS GATHERING LLC/TAYLOR COMP STA | CANTON, Bradford, PA | Pass | State |
| 2025-10-13 | PINE RUN MIDSTREAM LLC/BICKER COMP STA | CABOT, Butler, PA | Pass | State |
| 2025-10-13 | PRECISION CAPITAL, LP PAD 1 | HOP BOTTOM, Susquehanna, PA | Pass | State |
| 2025-10-13 | TUCKER, H. PAD 1 | MONTROSE, Susquehanna, PA | Pass | State |
| 2025-10-13 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Pass | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | LENZ ENTERPRISES INC | STANWOOD, Snohomish, WA | Fail | Local |
| 2025-10-13 | AHLSTROM RHINELANDER LLC | RHINELANDER, Outagamie, WI | Pass | State |
| 2025-10-13 | AHLSTROM RHINELANDER LLC | RHINELANDER, Outagamie, WI | Pass | State |
| 2025-10-13 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-13 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-13 | HATCHET COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-11 | ARKANSAS BIOENERGY, LLC - RUSSELLVILLE | RUSSELLVILLE, Pope, AR | Pass | State |
| 2025-10-11 | ARKANSAS BIOENERGY, LLC - RUSSELLVILLE | RUSSELLVILLE, Pope, AR | Pass | State |
| 2025-10-11 | SOLANA GENERATING STATION | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-11 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-11 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-10 | SUMMIT DJ-O OPERATING - KOKI — high-priority violation on file | JACKSON LAKE, Weld, CO | Pass | State |
| 2025-10-10 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-10 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-10 | TAMPA ELECTRIC COMPANY | TAMPA, Hillsborough, FL | Pass | State |
| 2025-10-10 | IPL � MARSHALLTOWN GENERATING STATION | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2025-10-10 | IDAHO FOREST GROUP LLC - MOYIE SPRINGS | MOYIE SPRINGS, Boundary, ID | Pass | State |
| 2025-10-10 | CLEARWATER PAPER CORP-PPD | LEWISTON, Nez Perce, ID | Pass | State |
| 2025-10-10 | KNIFE RIVER CORP - MTN WEST 00472 | BOISE, Ada, ID | Pass | State |
| 2025-10-10 | EVERGY - EMPORIA (AIR) | EMPORIA, Lyon, KS | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | CENTRAL STONE COMPANY - ANTONIA CS56 | ANTONIA, Jefferson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Fail | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | ENERSYS, INC. — high-priority violation on file | WARRENSBURG, Johnson, MO | Pass | State |
| 2025-10-10 | COLUMBIA GULF TRANSMISSION LLC, INVERNESS COMPRESSOR STATION | INVERNESS, Humphreys, MS | Pass | State |
| 2025-10-10 | COLUMBIA GULF TRANSMISSION LLC, INVERNESS COMPRESSOR STATION | INVERNESS, Humphreys, MS | Pass | State |
| 2025-10-10 | CHS INC REFINERY LAUREL | LAUREL, Yellowstone, MT | Pass | State |
| 2025-10-10 | NC MUNICIPAL POWER AGENCY NO. 1 - HIGH POINT WATER PUMP STAT | HIGH POINT, Guilford, NC | Pass | State |
| 2025-10-10 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-10 | CRONUS COMPRESSOR STATION | MALAGA, Lea, NM | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | BLUE RACER MIDSTREAM LLC - CARROLL CO FIELD STATION #1 | CARROLLTON, Carroll, OH | Pass | State |
| 2025-10-10 | GREEN CIRCLE GROWERS — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-10 | GREEN CIRCLE GROWERS — high-priority violation on file | OBERLIN, Lorain, OH | Pass | State |
| 2025-10-10 | WARRIOR MINERALS LLC / CANVASBACK SAND DRYING PLANT | GEARY, Caddo, OK | Pass | State |
| 2025-10-10 | TENNESSEE GAS PIPELINE CO/317 TROY STA | TROY, Bradford, PA | Pass | State |
| 2025-10-10 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-10 | NOMAN M. COLE JR. WATER RECYCLING FACILITY | LORTON, Fairfax, VA | Pass | State |
| 2025-10-10 | EQUINIX LLC (DC-21/DC-22) | ASHBURN, Loudoun, VA | Pass | State |
| 2025-10-10 | NOVA MANGO FARMS LLC | BRISTOW, Prince William, VA | Pass | State |
| 2025-10-10 | AMAZON DATA SERVICES INC. IAD450-456 COSNER TECH CAMPUS — high-priority violation on file | FREDERICKSBURG, Spotsylvania, VA | Fail | State |
| 2025-10-10 | NORTHWEST PIPELINE GP SUMNER | SUMNER, Pierce, WA | Pass | Local |
| 2025-10-10 | NORTHWEST PIPELINE GP SUMNER | SUMNER, Pierce, WA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.