How Clean Is Zumbro Lake?
Zumbro Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3.9 ft. Phosphorus: 69 µg/L. Trophic State Index: 61.
Cleanliness Snapshot
| Metric | Zumbro Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 3.9 ft | — |
| Phosphorus | 69 µg/L | <30 = clean |
| Trophic State Index | 61 | <50 = clean |
How does Zumbro Lake compare?
Zumbro Lake's grade of D falls below the Minnesota state average of C. It ranks #2 of 5 lakes in Olmsted County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.