New York
Toxic algae in Hamilton County lakes
12 lakes and waterways in Hamilton County have harmful algal bloom reports in New York's official data. The most recent entry is for Little Tupper Lake: Little Tupper Lake was on New York's harmful algal bloom list on 10 July 2025, with confirmed bloom status (1 report). Little Tupper Lake and Raquette Lake 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.
- Adirondack Lake 2025
- Eighth Lake 2017
- Lake Eaton 2016
- Lake Lila 2025
- Lake Pleasant 2012
- Piseco Lake 2024
- Seventh Lake 2017
- Willis Lake 2022
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.