New York

Toxic algae in Saratoga County lakes

7 lakes and waterways in Saratoga County have harmful algal bloom reports in New York's official data. The most recent entry is for Ballston Lake: Ballston Lake was on New York's harmful algal bloom list from 2 August 2025 to 3 August 2025, with confirmed bloom status (2 reports). Ballston Lake, Round Lake and Saratoga 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.

Ballston Lake Latest 2 August 2025, blooms in 6 years Confirmed bloom
Round Lake Latest 28 July 2025, blooms in 6 years Confirmed bloom
Saratoga Lake Latest 23 July 2025, blooms in 11 years Confirmed bloom
Lake Bonita Latest 23 June 2025, blooms in 2 years Confirmed bloom
Great Sacandaga Lake Latest 29 July 2024, blooms in 2 years Not listed in 2025
Moreau Lake Latest 5 September 2023, blooms in 4 years Not listed in 2025
Galway Lake Latest 3 July 2023, blooms in 2 years Not listed in 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.