Beach · Barnstable County · MA
Is East Sandwich safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · Massachusetts beach program (EPA BEACON)
SwimZone for iPhone · launching soon
Know before you get in at East Sandwich.
Get an alert the day a bacteria or algae advisory goes up.
What's in the water at East Sandwich right now
As of July 19, 2026, East Sandwich in Barnstable County, Massachusetts 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 0.9 in, which can wash bacteria and nutrients into the water.
Blue-green algae at East Sandwich
East Sandwich is a lake in Barnstable County, Massachusetts. 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 East Sandwich
- Is it safe to swim in East Sandwich right now?
- East Sandwich 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 East Sandwich have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at East Sandwich. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in East Sandwich?
- No bloom is detected at East Sandwich 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 Massachusetts lakes and beaches have swim advisories today?
- Today, 5 Massachusetts waters are under a swim advisory and 229 more warrant caution, out of 608 monitored waters SwimZone tracks in the state.
- How is East Sandwich'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 East Sandwich, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.