Toxic algae in Sonoma County, California
21 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Russian River | 8 | 2026 |
| Sonoma Creek | 4 | 2026 |
| Spring Lake | 4 | 2026 |
| Salmon Creek | 5 | 2023 |
| Lake Ralphine | 3 | 2023 |
| Lake Wilson | 2 | 2019 |
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.
- Austin Creek (2022)
- Bodega Bay (2024)
- Estero Americano River (2022)
- Fountaingrove Lake (2018)
- Fox Pond (2024)
- Lake Nagasawa (2022)
- Lake Sonoma (2022)
- Matanzas Creek (2024)
- Paulin Creek (2022)
- Petaluma River (2026)
- Ralphine Lake (2019)
- Ringstrom Unit Marsh (2026)
- Salmon Creek Lagoon (2022)
- Stockhoff Creek (2024)
- Yorty Creek (2026)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.