Lake Notice Lake & river toxic algae advisories

Los Angeles County: lake and river algae advisories

31 waters in Los Angeles County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.

WaterLatest record
Apollo Park LakeCaution advisory, last posted Oct 15, 2026. No all-clear recorded.
Castaic LakeWarning advisory, last posted Oct 19, 2026. No all-clear recorded.
El Dorado East Regional ParkCaution advisory, last posted Aug 4, 2022. No all-clear recorded.
Elizabeth LakeVisual observation, last posted Jun 2, 2025. No all-clear recorded.
Horseshoe LakeCaution advisory, last posted Nov 6, 2017. No all-clear recorded.
John Anson Ford Park LakeVisual observation, last posted Sep 28, 2026. No all-clear recorded.
La Mirada LakeVisual observation, last posted Sep 28, 2026. No all-clear recorded.
Lake HughesVisual observation, last posted Jun 20, 2024. No all-clear recorded.
Legg LakeCaution advisory, last posted Aug 27, 2026. No all-clear recorded.
Machado LakeCaution advisory, last posted Aug 26, 2024. No all-clear recorded.
Malibu CreekCaution advisory, last posted May 24, 2017. No all-clear recorded.
Malibu LakeCaution advisory, last posted Aug 31, 2020. No all-clear recorded.
North Legg LakeCaution advisory, last posted Sep 29, 2020. No all-clear recorded.
Pacific OceanVisual observation, last posted Oct 23, 2024. No all-clear recorded.
Pentachaeta CreekCaution advisory, last posted Mar 19, 2021. No all-clear recorded.
Puddingstone ReservoirCaution advisory, last posted May 14, 2026. No all-clear recorded.
Pyramid LakeWarning advisory, last posted Oct 14, 2026. No all-clear recorded.
Santa Fe ReservoirCaution advisory, last posted May 11, 2022. No all-clear recorded.
Venice CanalsWarning advisory, last posted Aug 8, 2025. No all-clear recorded.
Arroyo SecoReports on file, with no advisory level the state has classified.
Castaic LagoonThe state's latest record, from Sep 17, 2026, recommends no advisory.
Earvin Magic Johnson LakeThe state's latest record, from Aug 31, 2026, recommends no advisory.
Earvin Magic Johnson Park LakeThe state's latest record, from May 19, 2026, recommends no advisory.
El Dorado Park WestThe state's latest record, from Jun 30, 2025, recommends no advisory.
Hollenbeck ParkReports on file, with no advisory level the state has classified.
Lake LinderoThe state's latest record, from Oct 21, 2020, recommends no advisory.
Lake PiruThe state's latest record, from May 25, 2021, recommends no advisory.
Little Rock CreekThe state's latest record, from Jun 26, 2026, recommends no advisory.
Quail LakeThe state's latest record, from Oct 19, 2026, recommends no advisory.
Unnamed channelThe state's latest record, from Jun 4, 2025, recommends no advisory.
Unnamed Ditch in Trancas CanyonReports on file, with no advisory level the state has classified.