Is Harmony Lake Safe for Swimming?
Harmony Lake in Mercer County, Wisconsin has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 2.3 ft visibility. Chlorophyll-a (algae): 8.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 2.3 ft |
| Chlorophyll-a (Algae) | 8.4 μg/L |
| Location | Mercer County, Wisconsin |
How does Harmony Lake compare?
With an overall water quality grade of C, Harmony Lake matches or beats the Wisconsin state average of Grade C. It ranks #5 of 5 lakes in Mercer County by water quality score.
Water clarity (Secchi depth) sits at 2.3 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 8.4 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.