Toxic algae in Putnam County, New York
32 lakes and waterways have harmful algal bloom reports in New York's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Peach Lake | 10 | 2024 |
| Putnam Lake | 12 | 2025 |
| Kirk Lake | 11 | 2025 |
| Roaring Brook Lake | 11 | 2025 |
| Barger Pond | 10 | 2025 |
| Lake Carmel | 10 | 2025 |
| Lake Peekskill | 10 | 2025 |
| Croton Falls Reservoir | 7 | 2025 |
| Lake Casse | 7 | 2024 |
| Lake Tonetta | 4 | 2025 |
| Oscawana Lake | 4 | 2024 |
| White Pond | 4 | 2025 |
| Barrett Pond | 3 | 2023 |
| Diverting Reservoir | 3 | 2024 |
| Indian Lake | 2 | 2018 |
| Bog Brook Reservoir | 2 | 2024 |
| Cortlandt Lake | 2 | 2024 |
| Kentwood Lake | 2 | 2021 |
| Palmer Lake | 2 | 2019 |
| Secor Lake | 2 | 2025 |
| Seven Hills Lake | 2 | 2024 |
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.
- China Pond (2017)
- East Branch Reservoir (2024)
- Herrlich Pond (2020)
- Lake Celeste (2024)
- Lake Macgregor (2020)
- Lake Mahopac (2018)
- Lake Tibet (2021)
- Middle Branch Reservoir (2024)
- Patterson Veterans Park Swim Pond (2014)
- Sagamore Lake (2021)
- Wiccopee Reservoir (2025)
Source: New York State Department of Environmental Conservation (DEC), official data. For current conditions see the NYHABS map.