Orange County: lake and river algae advisories
12 waters in Orange County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.
| Water | Latest record |
|---|---|
| Carl Thornton Park | Visual observation, last posted Aug 8, 2025. No all-clear recorded. |
| Pacific Ocean | General awareness, last posted Apr 7, 2025. No all-clear recorded. |
| San Diego Creek | Caution advisory, last posted Jul 20, 2022. No all-clear recorded. |
| San Juan Creek | Algal mat alert sign, last posted Sep 1, 2026. No all-clear recorded. |
| San Mateo Canyon Creek | Algal mat alert sign, last posted May 19, 2025. No all-clear recorded. |
| West Street Basin | Caution advisory, last posted Nov 26, 2025. No all-clear recorded. |
| Bolsa Chico Ecological Reserve | Reports on file, with no advisory level the state has classified. |
| Cold Stream Canyon | The state's latest record, from May 10, 2024, recommends no advisory. |
| Devils Canyon Creek | The state's latest record, from May 19, 2025, recommends no advisory. |
| Laguna Niguel Park Lake | The state's latest record, from Aug 25, 2026, recommends no advisory. |
| Unnamed Channel | The state's latest record, from Jun 14, 2022, recommends no advisory. |
| Veeh Reservoir | Reports on file, with no advisory level the state has classified. |