New York
Toxic algae in Columbia County lakes
11 lakes and waterways in Columbia County have harmful algal bloom reports in New York's official data. The most recent entry is for Twin Lakes: Twin Lakes was not on New York's bloom list in 2025. It was last listed in 2024, with confirmed bloom status. Twin Lakes and Schor Pond 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.
- Chrysler Pond 2021
- Lake Taghkanic 2021
- Long Pond 2021
- Oakdale Lake 2024
- Olana Pond 2014
- Robinson Pond 2016
- Southerland Pond 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.