Mormon Slough at Weber Ave

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 Mormon Slough at Weber Ave safe to swim today?

+

Mormon Slough at Weber Ave is currently inconclusive for swimming. Last sample is over 30 days old — too stale to be a reliable swim-safety indicator.

When was Mormon Slough at Weber Ave last tested?

+

The most recent water-quality sample at Mormon Slough at Weber Ave was collected on Jun 30, 2026 (84 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).

What is the bacteria level at Mormon Slough at Weber Ave?

+

The latest reading at Mormon Slough at Weber Ave shows E. coli at 114 MPN/100mL (EPA single-sample limit: 235).

Does rain affect water quality at Mormon Slough at Weber Ave?

+

Yes. Heavy rainfall washes bacteria and pollutants from land into the water, raising contamination risk for 24–72 hours. The past 48 hours recorded 0.01 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 Mormon Slough at Weber Ave located?

+

Mormon Slough at Weber Ave is located in the East Bay area of the San Francisco Bay region (coordinates: 37.9520°N, 121.3045°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 Mormon Slough at Weber Ave 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.