Beach · Ozaukee County · WI
Is Harrington State Park Beach South safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · Wisconsin beach program (EPA BEACON)
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What's in the water at Harrington State Park Beach South right now
As of July 19, 2026, Harrington State Park Beach South in Ozaukee County, Wisconsin 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 0.0 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Harrington State Park Beach South
Harrington State Park Beach South is a lake in Ozaukee County, Wisconsin. 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 Harrington State Park Beach South
- Is it safe to swim in Harrington State Park Beach South right now?
- Harrington State Park Beach South 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 Harrington State Park Beach South have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Harrington State Park Beach South. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Harrington State Park Beach South?
- No bloom is detected at Harrington State Park Beach South 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 Wisconsin lakes and beaches have swim advisories today?
- Today, 91 Wisconsin waters are under a swim advisory and 11 more warrant caution, out of 564 monitored waters SwimZone tracks in the state.
- How is Harrington State Park Beach South'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 Harrington State Park Beach South, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.