Closed HAB Caution Advisory

HAB Caution Advisory in effect; elevated algae risk.

Last sampled: Apr 28, 2026 (8 days ago)

View official monitoring page

How is this decided?

Map

Recent Rainfall

48h rain (advisory ≥ 1.00 in) 0.00 in
72h rain (advisory ≥ 0.50 in) 0.00 in

Bacteria Readings

IndicatorLatest30-day geomeanEPA limit
E. coli10 MPN/100mL≤235

90-Day Enterococcus History

Showing the indicator with the most recent readings; agencies sometimes switch which one they report.

No enterococcus readings in the last 90 days

Nearby Swim Spots

Data from: East Bay Regional Park District Lakes (Public Domain), Open-Meteo — Precipitation (CC-BY 4.0)

Information provided for general guidance only. Conditions change rapidly. Swim at your own risk. Not medical advice.