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 |
|---|---|---|---|---|
| 2025-10-08 | ABBOTT NORTHWESTERN HOSPITAL | MINNEAPOLIS, Hennepin, MN | Pass | State |
| 2025-10-08 | FCA CO-OP | JACKSON, Jackson, MN | Pass | State |
| 2025-10-08 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-10-08 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Fail | State |
| 2025-10-08 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-10-08 | CLARIOS, LLC | SAINT JOSEPH, Buchanan, MO | Pass | State |
| 2025-10-08 | COLUMBIA GULF TRANSMISSION LLC, INVERNESS COMPRESSOR STATION | INVERNESS, Humphreys, MS | Pass | State |
| 2025-10-08 | COLUMBIA GULF TRANSMISSION LLC, INVERNESS COMPRESSOR STATION | INVERNESS, Humphreys, MS | Pass | State |
| 2025-10-08 | CAROLINA POULTRY POWER RG1, LLC | FARMVILLE, Pitt, NC | Pass | State |
| 2025-10-08 | MIYAMURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | LITTLE GIANTS 20 19 BATTERY | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-08 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | HERRADURA COMPRESSOR STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | LOST TANK 13 BOO STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | LOST TANK 13 BOO STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | LOST TANK 13 BOO STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | LOST TANK 13 BOO STATION | LOVING, Eddy, NM | Pass | State |
| 2025-10-08 | CAMACHO COMPRESSOR STATION | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-08 | CABO WABO COMPRESSOR STATION | MALAGA, Eddy, NM | Pass | State |
| 2025-10-08 | ALYSON TB | LA HUERTA, Eddy, NM | Pass | State |
| 2025-10-08 | CLETUS 28 CTB | CARLSBAD, Eddy, NM | Pass | State |
| 2025-10-08 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-08 | SEVEN RIVERS COMPRESSOR STATION | SEVEN RIVERS, Eddy, NM | Pass | State |
| 2025-10-08 | EOG - EL JEFE LGL STATION | JAL, Lea, NM | Pass | State |
| 2025-10-08 | ROCKEFELLER UNIVERSITY | MANHATTAN, New York, NY | Pass | State |
| 2025-10-08 | MARKWEST - SENECA GAS PLANT | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-10-08 | MARKWEST - SENECA GAS PLANT | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-10-08 | MARKWEST - SENECA GAS PLANT | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-10-08 | MARKWEST - SENECA GAS PLANT | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-10-08 | MARKWEST - SENECA GAS PLANT | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-10-08 | MARKWEST - SENECA GAS PLANT | SUMMERFIELD, Noble, OH | Pass | State |
| 2025-10-08 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | FAIRFIELD, Butler, OH | Pass | State |
| 2025-10-08 | USALCO FAIRFIELD PLANT, LLC — high-priority violation on file | FAIRFIELD, Butler, OH | Pass | State |
| 2025-10-08 | PPG - SOUTH PLANT — high-priority violation on file | BARBERTON, Summit, OH | Pass | State |
| 2025-10-08 | TENNESSEE GAS PIPELINE CO/319 WYALUSING | WYALUSING, Bradford, PA | Pass | State |
| 2025-10-08 | MAINESBURG GS LP/WELLS COMP STA | COVINGTON, Tioga, PA | Pass | State |
| 2025-10-08 | NYDIG DFM LLC - DUCHESNE DATA POWER STATION (FORMERLY CRUSOE ENERGY SYSTEMS) | UPALCO, Duchesne, UT | Pass | State |
| 2025-10-08 | TRANS-JORDAN CITIES LANDFILL | SOUTH JORDAN, Salt Lake, UT | Pass | State |
| 2025-10-08 | NORTHWEST PIPELINE LLC SNOHOMISH | SNOHOMISH, Snohomish, WA | Pass | Local |
| 2025-10-08 | NORTHWEST PIPELINE LLC SNOHOMISH | SNOHOMISH, Snohomish, WA | Pass | Local |
| 2025-10-08 | WESTLAKE NATRIUM LLC, WESTLAKE NATRIUM | PROCTOR, Marshall, WV | Pass | State |
| 2025-10-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-08 | LEAVITT COMPRESSOR STATION (THUNDER CREEK GAS SERVICES) | CAMPBELL COUNTY, Campbell, WY | Pass | State |
| 2025-10-08 | CASPER REFINERY (HF SINCLAIR CASPER REFINING LLC) — high-priority violation on file | EVANSVILLE, Natrona, WY | Fail | State |
| 2025-10-08 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-08 | GREEN RIVER SODA ASH PLANT (AMERICAN SODA LLC) | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-08 | JIM BRIDGER PLANT (PACIFICORP) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-08 | JIM BRIDGER PLANT (PACIFICORP) — high-priority violation on file | SWEETWATER COUNTY, Sweetwater, WY | Pass | State |
| 2025-10-07 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-07 | ROBERT'S TRUST COMPRESSOR STATION | DUNN COUNTY, Dunn, ND | Pass | U.S. EPA |
| 2025-10-07 | GOLDEN VALLEY ELECTRIC ASSOCIATION / HEALY POWER PLANT — high-priority violation on file | HEALY, Denali, AK | Pass | State |
| 2025-10-07 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-07 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-07 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-07 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-07 | TRANSCONTINENTAL GAS PIPE LINE COMPANY L | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-07 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-10-07 | BOISE WHITE PAPER LLC | JACKSON, Clarke, AL | Pass | State |
| 2025-10-07 | CONSTELLIUM — high-priority violation on file | MUSCLE SHOALS, Colbert, AL | Pass | State |
| 2025-10-07 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-07 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-07 | W&T OFFSHORE, INC. | MOBILE BAY, Mobile, AL | Pass | State |
| 2025-10-07 | ARCOSA LW BR, LLC | LIVINGSTON, Sumter, AL | Pass | State |
| 2025-10-07 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-07 | ALABAMA POWER COMPANY (MILLER POWER PLANT) | QUINTON, Jefferson, AL | Pass | Local |
| 2025-10-07 | AMERICAN CAST IRON PIPE COMPANY | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2025-10-07 | AMERICAN CAST IRON PIPE COMPANY | BIRMINGHAM, Jefferson, AL | Pass | Local |
| 2025-10-07 | EXPLORATORY VENTURES, LLC. | OSCEOLA, Mississippi, AR | Pass | State |
| 2025-10-07 | STELLA-JONES CORPORATION | DELIGHT, Pike, AR | Pass | State |
| 2025-10-07 | RAZORBACK GATHERING COMPANY, LLC - HILLTOP COMPRESSOR STATION | CLINTON, Van Buren, AR | Pass | State |
| 2025-10-07 | FAYETTEVILLE EXPRESS PIPELINE LLC - RUSSELL COMPRESSOR STATION | BALD KNOB, White, AR | Pass | State |
| 2025-10-07 | FAYETTEVILLE EXPRESS PIPELINE LLC - RUSSELL COMPRESSOR STATION | BALD KNOB, White, AR | Pass | State |
| 2025-10-07 | SUMCO SOUTHWEST CORPORATION — high-priority violation on file | MARICOPA COUNTY, Maricopa, AZ | Pass | Local |
| 2025-10-07 | PROCTER & GAMBLE | SACRAMENTO, Sacramento, CA | Pass | Local |
| 2025-10-07 | INLAND EMPIRE UTILITY AGENCY, A MUN WATER DIS | ONTARIO, San Bernardino, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
| 2025-10-07 | LINN OPERATING INC — high-priority violation on file | TAFT, Kern, CA | Pass | Local |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.