Is Delavan Lake Safe for Swimming?
Delavan Lake in Walworth County, Wisconsin has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 8.9 ft visibility. Phosphorus: 52.5 µg/L. Chlorophyll-a (algae): 9.1 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 8.9 ft |
| Phosphorus | 52.5 μg/L |
| Chlorophyll-a (Algae) | 9.1 μg/L |
| Maximum Depth | 52 ft |
| Location | Walworth County, Wisconsin |
How does Delavan Lake compare?
With an overall water quality grade of C, Delavan Lake falls below the Wisconsin state average of Grade B. It ranks #14 of 19 lakes in Walworth County by water quality score.
Water clarity (Secchi depth) sits at 8.9 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 9.1 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.
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