Beach · St. Thomas Island County · VI
Is FRENCHMAN'S BEACH safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · U.S. Virgin Islands beach program (EPA BEACON)
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Know before you get in at FRENCHMAN'S BEACH.
Get an alert the day a bacteria or algae advisory goes up.
What's in the water at FRENCHMAN'S BEACH right now
As of July 19, 2026, FRENCHMAN'S BEACH in St. Thomas Island County, U.S. Virgin Islands is clear to swim. Blue-green algae are not currently monitored at this water. No fecal-bacteria advisory is posted (state beach program). Rainfall over the past week totaled 0.1 in, which can wash bacteria and nutrients into the water.
Blue-green algae at FRENCHMAN'S BEACH
FRENCHMAN'S BEACH is a lake in St. Thomas Island County, U.S. Virgin Islands. Blue-green algae are not currently monitored at this water.
Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.
Frequently asked: swimming in FRENCHMAN'S BEACH
- Is it safe to swim in FRENCHMAN'S BEACH right now?
- FRENCHMAN'S BEACH is clear to swim today. Blue-green algae are not currently monitored at this water. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
- Does FRENCHMAN'S BEACH have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at FRENCHMAN'S BEACH. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in FRENCHMAN'S BEACH?
- No bloom is detected at FRENCHMAN'S BEACH today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.
- How many U.S. Virgin Islands lakes and beaches have swim advisories today?
- Today, none of the 44 monitored U.S. Virgin Islands waters SwimZone tracks are under a swim advisory.
- How is FRENCHMAN'S BEACH's water quality measured?
- SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors FRENCHMAN'S BEACH, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.