How Clean Is Mille Lacs Lake?
Mille Lacs Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 9 ft. Trophic State Index: 45.
Cleanliness Snapshot
| Metric | Mille Lacs Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 9 ft | — |
| Trophic State Index | 45 | <50 = clean |
How does Mille Lacs Lake compare?
Mille Lacs Lake's grade of C matches or beats the Minnesota state average of C. It ranks #10 of 11 lakes in Mille Lacs County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.