New York
Toxic algae in Orange County lakes
22 lakes and waterways in Orange County have harmful algal bloom reports in New York's official data. The most recent entry is for Lake Tiorati: Lake Tiorati was on New York's harmful algal bloom list on 12 August 2025, with confirmed bloom status (1 report). Lake Tiorati, Tuxedo Lake and Greenwood Lake and 8 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.
- Lake Tiorati Confirmed bloom
- Tuxedo Lake Confirmed bloom
- Goshen Reservoir Confirmed bloom
- Greenwood Lake Confirmed bloom
- Orange Lake Confirmed bloom
- Winding Hills Park Lake Confirmed bloom
- Beaver Dam Lake Confirmed bloom
- Highland Lake Not listed in 2025
- Silver Mine Lake Not listed in 2025
- Brown'S Pond Not listed in 2025
- Rio Reservoir Not listed in 2025
- Little We Wah Lake Not listed in 2025
- Wee Wah Lake Not listed in 2025
- Guymard Lake Not listed in 2025
- Brooks Lake Not listed in 2025
- Tomahawk Lake Not listed in 2025
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.
- Blythea Lake 2023
- Four Corners Pond 2012
- Hessian Lake 2017
- Monroe Pond 2020
- Muchattoes Lake 2017
- Wickham 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.