New York
Toxic algae in Warren County lakes
10 lakes and waterways in Warren County have harmful algal bloom reports in New York's official data. The most recent entry is for Schroon Lake: Schroon Lake was not on New York's bloom list in 2025. It was last listed in 2024, with confirmed bloom status. Schroon Lake, Lake George and Loon Lake and 2 more have had blooms in three or more years.
Lakes with bloom history
Newest report first. Each lake has its own page with the full history and what the results mean.
Other waterbodies with a report
These have one or two reports in a single year, which isn't enough history for a page of their own yet.
- Fourth Lake 2025
- Lake Luzerne 2025
- Round Pond 2021
- Wilkie Reservoir 2021
Source: New York State Department of Environmental Conservation (DEC), official data, checked 24 October 2026. For today's conditions see the NYHABS map. No report doesn't mean a lake is safe: most water is only tested occasionally.