Is Llagas Creek at Monterey Rd safe to swim today?
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Llagas Creek at Monterey Rd is currently inconclusive for swimming. Last sample is over 30 days old — too stale to be a reliable swim-safety indicator.
When was Llagas Creek at Monterey Rd last tested?
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The most recent water-quality sample at Llagas Creek at Monterey Rd was collected on Apr 21, 2026 (168 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).
What is the bacteria level at Llagas Creek at Monterey Rd?
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The latest reading at Llagas Creek at Monterey Rd shows E. coli at 650 MPN/100mL (EPA single-sample limit: 235).
Does rain affect water quality at Llagas Creek at Monterey Rd?
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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 Llagas Creek at Monterey Rd located?
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Llagas Creek at Monterey Rd is located in the South Bay area of the San Francisco Bay region (coordinates: 37.0957°N, 121.6168°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 Llagas Creek at Monterey Rd 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.