EPA Air · stack tests by county and year
Air-emissions stack tests in St. Louis County, Minnesota, 2025
- 19Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row below is one stack test recorded against a source in St. Louis County, Minnesota during 2025. A facility can appear several times: this is the year’s record of what happened, not a list of places. The sources themselves are on the St. Louis County facility page.
St. Louis County, Minnesota, 2025
Air-emissions stack tests in St. Louis County, other years
Air-emissions stack tests recorded in St. Louis County, Minnesota, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-11-24 | ME GLOBAL INC | Pass | State |
| 2025-11-17 | MINNESOTA POWER - HIBBARD RENEWABLE ENERGY CENTER | Pass | State |
| 2025-10-16 | UNITED STATES STEEL CORP - KEETAC | Pass | State |
| 2025-10-13 | UNITED TACONITE LLC - FAIRLANE PLANT | Pass | State |
| 2025-09-30 | WISCONSIN CENTRAL LTD | Pass | State |
| 2025-09-15 | US STEEL CORP - MINNTAC | Pass | State |
| 2025-09-08 | UNITED TACONITE LLC - THUNDERBIRD MINE | Pass | State |
| 2025-08-26 | HIBBING PUBLIC UTILITIES COMMISSION | Pass | State |
| 2025-08-06 | NORTHLAND CONSTRUCTORS OF DULUTH - NONMETALLIC | Pass | State |
| 2025-07-07 | UNITED STATES STEEL CORP - KEETAC | Pass | State |
| 2025-06-25 | HOOVER CONSTRUCTION CO - NONMETALLIC | Pass | State |
| 2025-06-10 | HIBBING TACONITE CO | Pass | State |
| 2025-05-14 | ME GLOBAL INC | Pass | State |
| 2025-05-12 | HIBBING TACONITE CO | N/A | State |
| 2025-05-07 | US STEEL CORP - MINNTAC | N/A | State |
| 2025-05-01 | US STEEL CORP - MINNTAC | Pass | State |
| 2025-04-21 | US STEEL CORP - MINNTAC | Pass | State |
| 2025-03-21 | UNITED TACONITE LLC - FAIRLANE PLANT | Pass | State |
| 2025-01-27 | UNITED TACONITE LLC - FAIRLANE PLANT | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.