Martin County · Treasure Coast · Atlantic Coast

Bathtub Reef Beach Water Quality

MODERATE

Water quality is MODERATE — Swim with caution

The most recent test at Bathtub Reef Beach showed enterococcus bacteria levels of 44 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.

Tested: Sunday, March 15, 2026
Reading: 44 CFU/100mL
Risk Rating: 8% poor results

Historical Risk Rating

8%

Bathtub Reef 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
42
Oct
32
Oct
32
Oct
92
Nov
44
Nov
32
Dec
31
Dec
39
Jan
53
Jan
40
Feb
40
Feb
44
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 Martin County area, use extra caution.

About Bathtub Reef Beach

A unique beach where a natural reef creates a shallow, calm pool perfect for families with young children — one of the Treasure Coast's most popular spots.

Martin 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.