Beach · San Juan County · WA
Is Olga Public Dock safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · Washington beach program (EPA BEACON)
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What's in the water at Olga Public Dock right now
As of July 19, 2026, Olga Public Dock in San Juan County, Washington 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 Olga Public Dock
Olga Public Dock is a lake in San Juan County, Washington. 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 Olga Public Dock
- Is it safe to swim in Olga Public Dock right now?
- Olga Public Dock 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 Olga Public Dock have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Olga Public Dock. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Olga Public Dock?
- No bloom is detected at Olga Public Dock 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 Washington lakes and beaches have swim advisories today?
- Today, 18 Washington waters are under a swim advisory and 9 more warrant caution, out of 1348 monitored waters SwimZone tracks in the state.
- How is Olga Public Dock'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 Olga Public Dock, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.