Beach · Monmouth County · NJ
Is Avon-by-the-Sea Borough at Sylvania safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · New Jersey beach program (EPA BEACON)
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Get an alert the day a bacteria or algae advisory goes up.
What's in the water at Avon-by-the-Sea Borough at Sylvania right now
As of July 19, 2026, Avon-by-the-Sea Borough at Sylvania in Monmouth County, New Jersey 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 0.2 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Avon-by-the-Sea Borough at Sylvania
Avon-by-the-Sea Borough at Sylvania is a lake in Monmouth County, New Jersey. 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 Avon-by-the-Sea Borough at Sylvania
- Is it safe to swim in Avon-by-the-Sea Borough at Sylvania right now?
- Avon-by-the-Sea Borough at Sylvania 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 Avon-by-the-Sea Borough at Sylvania have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Avon-by-the-Sea Borough at Sylvania. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Avon-by-the-Sea Borough at Sylvania?
- No bloom is detected at Avon-by-the-Sea Borough at Sylvania 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 New Jersey lakes and beaches have swim advisories today?
- Today, 4 New Jersey waters are under a swim advisory and 73 more warrant caution, out of 467 monitored waters SwimZone tracks in the state.
- How is Avon-by-the-Sea Borough at Sylvania'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 Avon-by-the-Sea Borough at Sylvania, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.