New York
Toxic algae in Allegany County lakes
5 lakes and waterways in Allegany County have harmful algal bloom reports in New York's official data. The most recent entry is for Alma Pond: Alma Pond was on New York's harmful algal bloom list on 24 September 2025, with confirmed bloom status (1 report).
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.
- Allen Lake 2020
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.