Toxic algae in Rockland County, New York
11 lakes and waterways have harmful algal bloom reports in New York's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Rockland Lake | 14 | 2025 |
| Lake Lucille | 6 | 2023 |
| Lake Welch | 6 | 2025 |
| Tomkins Lake | 4 | 2025 |
| Congers Lake | 3 | 2023 |
| East Branch Hackensack River | 2 | 2014 |
| Deforest Lake | 2 | 2023 |
| Lake Boyce | 2 | 2021 |
| Lake Welch Lagoon | 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.
- Hackensack River (2022)
- Swartwout Lake (2021)
Source: New York State Department of Environmental Conservation (DEC), official data. For current conditions see the NYHABS map.