St. Lucie County · Treasure Coast · Atlantic Coast

Avalon State Park Beach Water Quality

GOOD

Water quality is GOOD — Safe for swimming

The most recent test at Avalon State Park Beach showed enterococcus bacteria levels of 18 CFU/100mL, which is well within the safe range (35.4 or below CFU/100mL). Conditions are considered safe for swimming and water activities.

Tested: Sunday, March 15, 2026
Reading: 18 CFU/100mL
Risk Rating: 8% poor results

Historical Risk Rating

8%

Avalon State Park Beach has an excellent track record. Only 8% of tests in the last 12 months returned poor results.

Water Quality History — Last 12 Months

35.4
70.5
21
Oct
24
Oct
19
Oct
22
Nov
22
Nov
21
Dec
19
Dec
20
Jan
100
Jan
22
Feb
22
Feb
18
Mar

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 St. Lucie County area, use extra caution.

About Avalon State Park Beach

An undeveloped Atlantic beach in north St. Lucie County, Avalon State Park offers natural dunes, sea turtle nesting, and peaceful shoreline.

St. Lucie County Treasure Coast Atlantic Coast

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Learn More

Is It Safe to Swim After Rain?

Wait times, risk areas, and tips

Understanding Advisories

What the numbers and badges mean

Cleanest Beaches in Florida

Water quality rankings

How Bacteria Testing Works

CFU, sampling, and lab methods

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.