Toxic algae in Cortland County, New York
9 lakes and waterways have harmful algal bloom reports in New York's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Song Lake | 13 | 2025 |
| Tully Lake | 9 | 2025 |
| Dean Pond | 5 | 2018 |
| Melody Lake | 4 | 2025 |
| Casterline Pond | 3 | 2022 |
| Upper Little York Lake | 2 | 2020 |
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.
- Deans Pond (2014)
- Hope Lake (2024)
- Lower Little York Lake (2019)
Source: New York State Department of Environmental Conservation (DEC), official data. For current conditions see the NYHABS map.