New York
Toxic algae in Cortland County lakes
9 lakes and waterways in Cortland County have harmful algal bloom reports in New York's official data. The most recent entry is for Song Lake: Song Lake was on New York's harmful algal bloom list on 14 September 2025, with confirmed bloom status (1 report). Song Lake, Melody Lake and Tully 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.
- Deans Pond 2014
- Hope Lake 2024
- Lower Little York Lake 2019
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.