Toxic algae in Jefferson County, New York
15 lakes and waterways have harmful algal bloom reports in New York's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Lake Ontario | 8 | 2025 |
| Butterfield Lake | 10 | 2025 |
| Hyde Lake | 8 | 2025 |
| Moon Lake | 7 | 2025 |
| Payne Lake | 3 | 2025 |
| Sixtown Pond | 3 | 2025 |
| Boyd Lake | 2 | 2015 |
| Millsite Lake | 2 | 2018 |
| Red Lake | 2 | 2025 |
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.
- Greenwood Lake (2023)
- Kents Creek (2025)
- Lake Of The Woods (2015)
- Muskellunge Lake (2020)
- Sixberry Lake (2015)
- Sixtown Pond/Crystal Lake (2016)
Source: New York State Department of Environmental Conservation (DEC), official data. For current conditions see the NYHABS map.