Blue-green Algae in California
5 confirmed blue-green algae reports in California, none currently active. About this disease: symptoms and prevention.
5
Reports on record
0
Currently active
0
Last 7 days
0
Last 30 days
Where in the state
1
Recent reports
Blue-green Algae
Historical · Sep 3, 2026
Mountain Center
Lake Hemet: Warning advisory, harmful algal bloom confirmed. Keep dogs out of the water
Source ↗Blue-green Algae
Historical · Aug 28, 2026
Crowley Lake
Crowley Lake: Danger advisory at Hilton Creek Drainage (stay out), Caution at South Landing Marina
Source ↗Blue-green Algae
Historical · Aug 27, 2026
Big Bear Lake
Big Bear Lake: Warning advisory, harmful algal blooms throughout the lake. Keep pets out of the water
Source ↗Blue-green Algae
Historical · Jul 30, 2026
Navarro
Two toxic-algae advisories on the Navarro River in July 2026; pinned at Navarro River Redwoods State Park
Source ↗Blue-green Algae
Historical · Jul 29, 2026
Scotia, Humboldt County
Eel River near Scotia, dog died after swimming in a stagnant side pool
Source ↗