How Clean Is Lake Delton?
Lake Delton has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 2.5 ft. Trophic State Index: 64.
Cleanliness Snapshot
| Metric | Lake Delton | Wisconsin avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 2.5 ft | — |
| Trophic State Index | 64 | <50 = clean |
How does Lake Delton compare?
Lake Delton's grade of F falls below the Wisconsin state average of C. It ranks #10 of 11 lakes in Sauk County by water quality score. Multi-year monitoring data shows water quality is declining based on 4 years of records.