Toxic algae in Los Angeles County, California
34 lakes and waterways have harmful algal bloom reports in California's official data.
Lakes with bloom history
| Lake | Years with reports | Most recent |
|---|---|---|
| Pyramid Lake | 9 | 2026 |
| Castaic Lake | 5 | 2022 |
| Puddingstone Reservoir | 3 | 2024 |
| Machado Lake | 3 | 2024 |
| East Fork San Gabriel River | 1 | 2026 |
| El Dorado Lakes | 3 | 2019 |
| Lake Lindero | 1 | 2020 |
| Legg Lake | 2 | 2024 |
| West Fork San Gabriel River | 1 | 2026 |
| Castaic Lagoon | 2 | 2022 |
| Quail Lake | 2 | 2022 |
| Santa Fe Reservoir | 2 | 2025 |
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.
- Apollo Park Lake (2024)
- Bull Creek (2020)
- Crystal Lake (2018)
- Dume Creek (2017)
- Earvin Magic Johnson Lake (2026)
- Earvin Magic Johnson Park Lake (2026)
- Elizabeth Lake (2025)
- Horseshoe Lake (2017)
- John Anson Ford Park Lake (2026)
- La Mirada Lake (2026)
- Lake Hughes (2024)
- Lake Palmdale (2023)
- Lake Piru (2021)
- Little Rock Creek (2026)
- Los Angeles River (2021)
- Malibou Lake (2020)
- Malibu Creek (2017)
- North Fork San Gabriel River (2026)
- Pico Watershed Channel (2025)
- Potrero Valley Creek (2021)
- Silver Lake Reservoir (2018)
- Upper Cattle Canyon Creek (2026)
Source: California State Water Resources Control Board, official data. For current conditions see the California HABs Portal map.