How Clean Is Mille Lacs Lake?
Mille Lacs Lake is a clean lake by Minnesota standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 10.5 ft. Trophic State Index: 43.
Cleanliness Snapshot
| Metric | Mille Lacs Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 10.5 ft | — |
| Trophic State Index | 43 | <50 = clean |
How does Mille Lacs Lake compare?
Mille Lacs Lake's grade of B matches or beats the Minnesota state average of C. It ranks #17 of 53 lakes in Aitkin County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.