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 |
|---|---|---|---|---|
| 2025-10-23 | REGENCY MARCELLUS GAS GATHERING/CANOE RUN COMP STA | SALLADASBURG, Lycoming, PA | Pass | State |
| 2025-10-23 | WILLIAMS FIELD SVC CO LLC/LATHROP COMP STA | SPRINGVILLE, Susquehanna, PA | Pass | State |
| 2025-10-23 | REGENCY MARCELLUS GAS GATHERING LLC/OGONTZ WEST COMP STA | CUMMINS TWP, Lycoming, PA | Pass | State |
| 2025-10-23 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Fail | State |
| 2025-10-23 | CENTURY ALUMINUM OF SOUTH CAROLINA INC — high-priority violation on file | GOOSE CREEK, Berkeley, SC | Pass | State |
| 2025-10-23 | NEW-INDY CATAWBA LLC | CATAWBA, York, SC | Pass | State |
| 2025-10-23 | BANKS CONSTRUCTION COMPANY WALTERBORO | WALTERBORO, Colleton, SC | Pass | State |
| 2025-10-23 | TENNESSEE OPERATIONS OF EASTMAN CHEMICAL COMPANY — high-priority violation on file | KINGSPORT, Sullivan, TN | Pending | State |
| 2025-10-23 | DOMTAR PAPER COMPANY, LLC | KINGSPORT, Sullivan, TN | Pass | State |
| 2025-10-23 | MUELLER CO. LLC — high-priority violation on file | CHATTANOOGA, Hamilton, TN | Pass | Local |
| 2025-10-23 | CEMEX CONSTRUCTION MATERIALS ATLANTIC, LLC - KNOXVILLE CEMENT PLANT | KNOXVILLE, Knox, TN | Pass | Local |
| 2025-10-23 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-23 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-23 | COMPASS MINERALS | UTAH, Undetermined, UT | Pass | State |
| 2025-10-23 | AMAZON DCA-54 | FORT BELVOIR, Fairfax, VA | Pass | State |
| 2025-10-23 | COMPASS IAD DATACENTER | LEESBURG, Loudoun, VA | Pass | State |
| 2025-10-23 | DIGITAL THIRD SECOND MANASSAS, LLC & DIGITAL CARVER BRICKYARD, LLC. — high-priority violation on file | MANASSAS, Manassas (city), VA | Fail | State |
| 2025-10-23 | CAPITAL POWER CORPORATION | TACOMA, Pierce, WA | Pass | Local |
| 2025-10-23 | COLUMBIA WEST VIRGINIA CORPORATION, CRAIGSVILLE | CRAIGSVILLE, Nicholas, WV | Pass | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | Pass | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-10-22 | AURORA ENERGY LLC / CHENA POWER PLANT — high-priority violation on file | FAIRBANKS, Fairbanks North Star, AK | N/A | State |
| 2025-10-22 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-22 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-22 | KRONOSPAN USA — high-priority violation on file | EASTABOGA, Calhoun, AL | Pass | State |
| 2025-10-22 | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC | BUTLER, Choctaw, AL | Pass | State |
| 2025-10-22 | HILCORP ENERGY COMPANY | CREOLA, Mobile, AL | Pass | State |
| 2025-10-22 | HILCORP ENERGY COMPANY | CREOLA, Mobile, AL | Pass | State |
| 2025-10-22 | WARRIOR MET COAL GAS, LLC | TUSCALOOSA, Tuscaloosa, AL | Pass | State |
| 2025-10-22 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-10-22 | DESOTO GATHERING COMPANY, LLC - COVE CREEK CPF-4 | DAMASCUS, Van Buren, AR | Pass | State |
| 2025-10-22 | FREEPORT MCMORAN - MIAMI SMELTER | MIAMI, Gila, AZ | Pass | State |
| 2025-10-22 | DRAKE CEMENT- DRAKE ROAD SITE — high-priority violation on file | PAULDEN, Yavapai, AZ | Pass | State |
| 2025-10-22 | LADW&P-HAYNES STEAM | LONG BEACH, Los Angeles, CA | Pass | Local |
| 2025-10-22 | WES DJ GATHERING - FREDERICK CS — high-priority violation on file | DACONO AREA, Weld, CO | Pass | State |
| 2025-10-22 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-10-22 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-10-22 | DELAWARE CITY REFINING CO-DELAWARE CITY — high-priority violation on file | DELAWARE CITY, New Castle, DE | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ENVIVA, LLC | COTTONDALE, Jackson, FL | Pass | State |
| 2025-10-22 | ORLANDO UTILITIES COMMISSION | ORLANDO, Orange, FL | Pass | State |
| 2025-10-22 | MOSAIC FERTILIZER LLC — high-priority violation on file | MULBERRY, Polk, FL | Pass | State |
| 2025-10-22 | CERTAINTEED GYPSUM PALATKA, LLC | PALATKA, Putnam, FL | Pass | State |
| 2025-10-22 | CERTAINTEED GYPSUM PALATKA, LLC | PALATKA, Putnam, FL | Pass | State |
| 2025-10-22 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2025-10-22 | STERILIZATION SERVICES OF GEORGIA | ATLANTA, Fulton, GA | Pass | State |
| 2025-10-22 | TOYOTA INDUSTRIES COMPRESSOR PARTS AMERICA, CO. | PENDERGRASS, Jackson, GA | Pass | State |
| 2025-10-22 | VALERO RENEWABLE FUELS CO LLC-ALBERTCITY | ALBERT CITY, Buena Vista, IA | Pass | State |
| 2025-10-22 | ENTERPRISE NGL PIPELINE- IOWA CITY TERMINAL | IOWA CITY, Johnson, IA | Pass | State |
| 2025-10-22 | IPL � MARSHALLTOWN GENERATING STATION | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2025-10-22 | IPL � MARSHALLTOWN GENERATING STATION | MARSHALLTOWN, Marshall, IA | Pass | State |
| 2025-10-22 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-10-22 | SSAB IOWA INC — high-priority violation on file | MUSCATINE, Muscatine, IA | Pass | State |
| 2025-10-22 | OSMIUM DATA CENTER — high-priority violation on file | WEST DES MOINES, Warren, IA | Fail | State |
| 2025-10-22 | OSMIUM DATA CENTER — high-priority violation on file | WEST DES MOINES, Warren, IA | Fail | State |
| 2025-10-22 | J R SIMPLOT COMPANY-DON SIDING POCATELLO — high-priority violation on file | POCATELLO, Power, ID | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | KNAUF INSULATION INCORPORATED — high-priority violation on file | SHELBYVILLE, Shelby, IN | Pass | State |
| 2025-10-22 | MGPI PROCESSING (AIR) | ATCHISON, Atchison, KS | Pass | State |
| 2025-10-22 | DCP OPERATING - COMANCHE CO. #3 STATION (DEHY) (AIR) | COLDWATER, Comanche, KS | Pass | State |
| 2025-10-22 | MID-MAINE WASTE ACTION CORPORATION | AUBURN, Androscoggin, ME | Pass | State |
| 2025-10-22 | FORD MOTOR COMPANY - FLAT ROCK ASSEMBLY | FLAT ROCK, Wayne, MI | Pass | State |
| 2025-10-22 | GRAYLING GENERATING STATION LTD PARTNER | GRAYLING, Crawford, MI | Fail | State |
| 2025-10-22 | NORTHERN OAKS RECYCLING AND DISPOSAL FACILITY | HARRISON, Clare, MI | Pass | State |
| 2025-10-22 | ENERGY DEVELOPMENTS MICHIGAN, LLC | MONTROSE, Genesee, MI | Pass | State |
| 2025-10-22 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Pass | State |
| 2025-10-22 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Pass | State |
| 2025-10-22 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Pass | State |
| 2025-10-22 | RIVER CEMENT CO. DBA BUZZI UNICEM USA SELMA PLANT | FESTUS, Jefferson, MO | Pass | State |
| 2025-10-22 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Fail | State |
| 2025-10-22 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-22 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Fail | State |
| 2025-10-22 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-22 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-22 | EP ENGINEERED CLAYS CORPORATION — high-priority violation on file | JACKSON, Hinds, MS | Pass | State |
| 2025-10-22 | USG INTERIORS LLC | GREENVILLE, Washington, MS | Pass | State |
| 2025-10-22 | USG INTERIORS LLC | GREENVILLE, Washington, MS | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.