Ninety days of readings.
Log scale · MPN/100mLEach dot is one sample taken by the monitoring agency. The dashed brick line marks the EPA single-sample limit.
SafeCautionUnsafe
A newer sample on Jul 13 (14 days ago) reported a different analyte, so the chart's last point for E. coli is older than the most recent sample date. The swim status still reflects the most recent E. coli reading shown here — a newer sample that skipped this analyte can't clear an earlier exceedance.
Common questions.
- Is Montara State Beach safe to swim today?
- Montara State Beach is currently safe for swimming. Recent samples within safe ranges.
- When was Montara State Beach last tested?
- The most recent water-quality sample at Montara State Beach was collected on Jul 13, 2026 (25 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).
- Does rain affect water quality at Montara State 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 0.06 in. Our advisory threshold is ≥1.00 in over 48h (or ≥0.50 in over 72h) for enclosed or storm-drain beaches.
- Where is Montara State Beach located?
- Montara State Beach is located in the Peninsula area of the San Francisco Bay region (coordinates: 37.5242°N, 122.5180°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 Montara State 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: California Safe-to-Swim (ODbL 1.0) · Open-Meteo — Precipitation (CC-BY 4.0) · Pipeline status