Is Lake Mallalieu Safe for Swimming?
Lake Mallalieu in St. Croix County, Wisconsin has a water quality grade of D (Poor). Swimming not recommended, poor water quality with high algae risk. Water clarity: 2.8 ft visibility. Phosphorus: 54.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 2.8 ft |
| Phosphorus | 54.4 μg/L |
| Location | St. Croix County, Wisconsin |
How does Lake Mallalieu compare?
With an overall water quality grade of D, Lake Mallalieu falls below the Wisconsin state average of Grade C. It ranks #4 of 5 lakes in St. Croix County by water quality score.
Water clarity (Secchi depth) sits at 2.8 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff.