How Clean Is Lake Mendota?
Lake Mendota is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 18 ft. Phosphorus: 50.2 µg/L. Trophic State Index: 48.
Cleanliness Snapshot
| Metric | Lake Mendota | Wisconsin avg |
|---|---|---|
| Overall Grade | B | B |
| Water Clarity (Secchi) | 18 ft | — |
| Phosphorus | 50.2 µg/L | <30 = clean |
| Trophic State Index | 48 | <50 = clean |
How does Lake Mendota compare?
Lake Mendota's grade of B matches or beats the Wisconsin state average of B. It ranks #3 of 23 lakes in Dane County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.