Common questions.
- Is Niles Beach safe to swim today?
- Niles Beach is currently not safe for swimming. HAB Danger Advisory in effect; swimming not recommended.
- Does rain affect water quality at Niles Beach?
- 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 Niles Beach located?
- Niles Beach is located in the East Bay area of the San Francisco Bay region (coordinates: 37.5821°N, 121.9849°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 Niles Beach 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.
Also nearby
Data: East Bay Regional Park District Lakes (Public Domain) · Open-Meteo — Precipitation (CC-BY 4.0) · Pipeline status