New York
Toxic algae in Livingston County lakes
4 lakes and waterways in Livingston County have harmful algal bloom reports in New York's official data. The most recent entry is for Hemlock Lake: Hemlock Lake was on New York's harmful algal bloom list from 28 July 2025 to 11 August 2025, with confirmed bloom status (2 reports). Hemlock Lake, Avon Marsh Dam Pond and Conesus 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.
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.