Toxic algae in Westchester County, New York
31 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 Mohegan | 12 | 2025 |
| Lake Lincolndale | 10 | 2025 |
| Bedford Lake | 9 | 2022 |
| Lake Waccabuc | 8 | 2022 |
| Lake Katonah | 3 | 2015 |
| New Croton Reservoir | 4 | 2025 |
| Sheldrake Lake | 4 | 2022 |
| Truesdale Lake | 4 | 2025 |
| Muscoot Reservoir | 3 | 2025 |
| New Rochelle Reservoir No.1 | 3 | 2025 |
| Glenwood Lake | 2 | 2022 |
| Halsey Pond | 2 | 2025 |
| Kensico Reservoir | 2 | 2024 |
| Lake Oscaleta | 2 | 2018 |
| Lake Purdys | 2 | 2025 |
| Lake Rippowam | 2 | 2018 |
| New Rochelle Reservoir No.3 | 2 | 2018 |
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.
- Amawalk Reservoir (2023)
- Blue Heron Lake (2014)
- Cortlandt Lake (2018)
- Cross River Reservoir (2023)
- Goodliffe Pond (2016)
- Grassy Sprain Reservoir (2014)
- Huguenot Lake (2021)
- Lake Mitchell (2025)
- Lounsbury Pond (2016)
- Mohansic Lake (2024)
- Paine Lake (2018)
- Silver Lake (2017)
- Swan Lake (2024)
- Tarrytown Reservoir (2013)
Source: New York State Department of Environmental Conservation (DEC), official data. For current conditions see the NYHABS map.