Sarasota County · Sarasota / Bradenton · Gulf Coast
Siesta Key Beach Water Quality
Water quality is MODERATE — Swim with caution
The most recent test at Siesta Key Beach showed enterococcus bacteria levels of 47 CFU/100mL, which is in the moderate range (35.5–70.4 CFU/100mL). While not unsafe, sensitive individuals (young children, elderly, those with weakened immune systems) may want to avoid swimming.
Historical Risk Rating
Siesta Key Beach has an acceptable track record, though 17% of recent tests showed elevated bacteria levels.
Water Quality History — Last 12 Months
Values in CFU/100mL. Green = Good (≤35.4), Yellow = Moderate (35.5–70.4), Red = Poor (≥70.5)
Swimming After Rain
Rainfall can wash bacteria, fertilizers, and other pollutants into the ocean through stormwater runoff. The Florida DOH recommends waiting at least 72 hours after heavy rain before swimming, especially near inlets, canals, and river mouths. If it has rained recently in the Sarasota County area, use extra caution.
About Siesta Key Beach
Famous for its 99% pure quartz crystal sand that stays cool underfoot, Siesta Key Beach has been named America's #1 beach by multiple publications.
Nearby Beaches
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Disclaimer: Water quality data is sourced from the Florida Department of Health Healthy Beaches Program. Conditions can change rapidly. This website provides informational estimates only — always check with Florida DOH for official, real-time beach conditions. Safe to Swim Florida is an independent project and is not affiliated with any government agency.