EPA Air · stack tests by county and year
Air-emissions stack tests in St. Lawrence County, New York, 2025
- 4Stack 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. Lawrence County, New York 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. Lawrence County facility page.
St. Lawrence County, New York, 2025
- Inspections 38
Air-emissions stack tests in St. Lawrence County, other years
Air-emissions stack tests recorded in St. Lawrence County, New York, 2025
| Date | Facility | Kind | Agency |
|---|---|---|---|
| 2025-10-28 | SHEEHAN ASPHALT PLANT POTSDAM | Fail | State |
| 2025-10-20 | HOOSIER MAGNETICS INC | Pass | State |
| 2025-07-29 | BARRETT PAVING NORWOOD QUARRY | Pass | State |
| 2025-07-22 | DUNN PAPER - NATURAL DAM | Pass | State |
Dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.