Toxic algae in Greene County, New York
5 lakes and waterways have harmful algal bloom reports in New York's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Sleepy Hollow Lake | 8 | 2025 |
| North-South Lake | 2 | 2023 |
Other waterbodies with a report
These have one or two reports in a single year, so there isn't enough history for a page of their own yet.
- Catskill Creek (2025)
- Coxsackie Reservoir (2017)
- Hollister Lake (2017)
Source: New York State Department of Environmental Conservation (DEC), official data. For current conditions see the NYHABS map.