New York
Toxic algae in Chautauqua County lakes
7 lakes and waterways in Chautauqua County have harmful algal bloom reports in New York's official data. The most recent entry is for Findley Lake: Findley Lake was on New York's harmful algal bloom list from 12 August 2025 to 3 September 2025, with confirmed bloom status (3 reports). Findley Lake and Chautauqua 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.
- Bear Lake 2018
- Chadakoin River 2022
- Conewango Creek 2020
- Lake Erie 2025
- Walnut Creek 2025
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.