Lake Del Valle
east bay Caution
Closed
HAB Caution Advisory
HAB Caution Advisory in effect; elevated algae risk.
Last sampled: Apr 28, 2026 (8 days ago)
Map
Recent Rainfall
48h rain (advisory ≥ 1.00 in) 0.00 in
72h rain (advisory ≥ 0.50 in) 0.00 in
Bacteria Readings
| Indicator | Latest | 30-day geomean | EPA limit |
|---|---|---|---|
| E. coli | 10 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)