Sarasota County · Sarasota / Bradenton · Gulf Coast
Siesta Key Beach water quality history
This page is for swimmers who want the deeper historical story at Siesta Key Beach: recent readings, spike frequency, and how often the beach has slipped into poor territory.
Current picture
GOOD on the latest sample at 10 CFU/100mL.
Long-term context
2 poor samples and 12 non-good samples in the displayed history.
Rain still matters
Stormwater can make this page stale faster than the normal testing schedule, especially after heavy rain.
Poor samples shown
2
out of 12 displayed samples.
Latest poor sample
November 15, 2025
This is the last time the displayed history shows a poor result.
Historical risk
17%
share of poor samples in the displayed history.
Water Quality History — Last 12 Months
Values in CFU/100mL. Green = Good (≤35.4), Yellow = Moderate (35.5–70.4), Red = Poor (≥70.5)
Nearby Beaches With Lower Risk
Nearby alternatives →Lido Key Beach
Sarasota County · Gulf Coast · 4 mi away
No poor samples in the displayed history · risk 0%
Turtle Beach
Sarasota County · Gulf Coast · 4 mi away
No poor samples in the displayed history · risk 0%
Nokomis Beach
Sarasota County · Gulf Coast · 12 mi away
No poor samples in the displayed history · risk 0%
Venice Beach
Sarasota County · Gulf Coast · 13 mi away
No poor samples in the displayed history · risk 0%
Holmes Beach
Manatee County · Gulf Coast · 18 mi away
No poor samples in the displayed history · risk 0%
Englewood Beach
Charlotte County · Gulf Coast · 27 mi away
No poor samples in the displayed history · risk 0%
Recent Warning-Sign Samples
Full history →March 15, 2026
47 CFU/100mL · MODERATE
February 28, 2026
62 CFU/100mL · MODERATE
February 13, 2026
54 CFU/100mL · MODERATE
January 29, 2026
51 CFU/100mL · MODERATE
January 14, 2026
55 CFU/100mL · MODERATE
December 30, 2025
46 CFU/100mL · MODERATE
Keep Exploring Nearby
How To Use This Page
This page is for swimmers who want the deeper historical story at Siesta Key Beach: recent readings, spike frequency, and how often the beach has slipped into poor territory.
Use this view as a decision aid, not a guarantee. The latest sample, visible runoff, and recent weather still matter more than any single list or chart.
If you want the main same-day answer instead, go back to the Siesta Key Beach beach page.
Data from FL DOH Healthy Beaches Program. This is an independent project — check with Florida DOH for official conditions.