Is Green Lake Safe for Swimming?
Green Lake in Green Lake County, Wisconsin has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 11.5 ft visibility. Phosphorus: 66.5 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 11.5 ft |
| Phosphorus | 66.5 μg/L |
| Maximum Depth | 236 ft |
| Location | Green Lake County, Wisconsin |
How does Green Lake compare?
With an overall water quality grade of C, Green Lake matches or beats the Wisconsin state average of Grade C. It ranks #6 of 13 lakes in Green Lake County by water quality score.
Water clarity (Secchi depth) sits at 11.5 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.