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 May 26 (22 days ago) reported Total coliform but not Fecal coliform, so the chart's last point is older than the most recent reading. The current reading shown above reflects that newer sample.
Common questions.
- Is South of Market near San Francisco safe to swim today?
- South of Market near San Francisco is currently safe for swimming. Recent samples within safe ranges.
- When was South of Market near San Francisco last tested?
- The most recent water-quality sample at South of Market near San Francisco was collected on May 26, 2026 (7 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).
- Does rain affect water quality at South of Market near San Francisco?
- 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 South of Market near San Francisco located?
- South of Market near San Francisco is located in the San Francisco area of the San Francisco Bay region (coordinates: 37.7634°N, 122.3869°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 South of Market near San Francisco 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