Beach · Guam County · GU
Is Beach at Inalåhan Bay safe to swim?
Recent heavy rain may have spiked bacteria since the last clear sample.
Updated July 19, 2026 · Guam 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 Beach at Inalåhan Bay right now
As of July 19, 2026, Beach at Inalåhan Bay in Guam County, Guam carries a swim caution. 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 1.6 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Beach at Inalåhan Bay
Beach at Inalåhan Bay is a lake in Guam County, Guam. 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 Beach at Inalåhan Bay
- Is it safe to swim in Beach at Inalåhan Bay right now?
- Beach at Inalåhan Bay carries a swim caution 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 Beach at Inalåhan Bay have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Beach at Inalåhan Bay. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Beach at Inalåhan Bay?
- No bloom is detected at Beach at Inalåhan Bay 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 Guam lakes and beaches have swim advisories today?
- Today, 0 Guam waters are under a swim advisory and 31 more warrant caution, out of 31 monitored waters SwimZone tracks in the state.
- How is Beach at Inalåhan Bay'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 Beach at Inalåhan Bay, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.