Toxic algae in Merced County, California
3 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| San Luis Reservoir | 9 | 2026 |
| O'Neill Reservoir | 5 | 2021 |
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.
- Los Banos Creek Reservoir (2022)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.