Lakeshore Park

Each dot is one sample taken by the monitoring agency. Dashed lines mark each indicator's EPA single-sample limit; bars along the bottom show daily rainfall.

Common questions.

Is Lakeshore Park safe to swim today?

+

Lakeshore Park is currently not safe for swimming. One or more bacteria readings exceeded EPA thresholds in the most recent sample. See the readings below for which indicator and how far above the limit.

When was Lakeshore Park last tested?

+

The most recent water-quality sample at Lakeshore Park was collected on Sep 14, 2026 (8 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).

What is the bacteria level at Lakeshore Park?

+

The latest reading at Lakeshore Park shows E. coli at 171 MPN/100mL (EPA single-sample limit: 235); 30-day enterococcus geomean at 15 MPN/100mL (EPA geomean limit: 35); and enterococcus at 41 MPN/100mL (EPA single-sample limit: 104).

Does rain affect water quality at Lakeshore Park?

+

Yes. Heavy rainfall washes bacteria and pollutants from land into the water, raising contamination risk for 24–72 hours. The past 48 hours recorded 0.00 in of rain; the past 72 hours recorded 0.00 in. Our advisory threshold is ≥1.00 in over 48h (or ≥0.50 in over 72h) for enclosed or storm-drain beaches.

Where is Lakeshore Park located?

+

Lakeshore Park is located in the Peninsula area of the San Francisco Bay region (coordinates: 37.5498°N, 122.2860°W). You can get turn-by-turn directions via Google Maps or Apple Maps directly from this page.

How is the water quality data for Lakeshore Park collected?

+

Bacteria samples are collected by California state and county health agencies under the AB 411 Safe-to-Swim program and reported to the state's Safe-to-Swim database (data.ca.gov). Rainfall figures come from Open-Meteo forecast and archive data. Bay Area Swim aggregates both sources and updates every morning.