How Clean Is Loon Lake?
Loon Lake 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 ft. Trophic State Index: 67.
Cleanliness Snapshot
| Metric | Loon Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 2 ft | — |
| Trophic State Index | 67 | <50 = clean |
How does Loon Lake compare?
Loon Lake's grade of F falls below the Minnesota state average of C. It ranks #9 of 9 lakes in Blue Earth County by water quality score. Multi-year monitoring data shows water quality is declining based on 3 years of records.