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.
Each dot is one sample taken by the monitoring agency. The dashed brick line marks the EPA single-sample limit.
SafeCautionUnsafe
Common questions.
Is Chicken ranch ditch - channel b safe to swim today?
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Chicken ranch ditch - channel b 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 Chicken ranch ditch - channel b last tested?
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The most recent water-quality sample at Chicken ranch ditch - channel b was collected on Aug 3, 2026 (4 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).
What is the bacteria level at Chicken ranch ditch - channel b?
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The latest reading at Chicken ranch ditch - channel b shows 30-day enterococcus geomean at 68 MPN/100mL (EPA geomean limit: 35); E. coli at 206 MPN/100mL (EPA single-sample limit: 235); and enterococcus at 52 MPN/100mL (EPA single-sample limit: 104).
Does rain affect water quality at Chicken ranch ditch - channel b?
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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 Chicken ranch ditch - channel b located?
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Chicken ranch ditch - channel b is located in the Marin area of the San Francisco Bay region (coordinates: 38.1100°N, 122.8653°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 Chicken ranch ditch - channel b collected?
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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.