New York
Toxic algae in Cattaraugus County lakes
8 lakes and waterways in Cattaraugus County have harmful algal bloom reports in New York's official data. The most recent entry is for Red House Lake: Red House Lake was on New York's harmful algal bloom list from 11 August 2025 to 29 October 2025, with confirmed bloom status (14 reports). Red House Lake, Quaker Lake and Lime Lake and 1 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.
- Beaver Lake 2012
- Beaver Lake Inlet 2012
- Crystal Lake 2024
- Harwood Lake 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.