How Clean Is Flat Lake?
Flat Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 11.2 ft. Phosphorus: 13 µg/L. Trophic State Index: 42.
Cleanliness Snapshot
| Metric | Flat Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 11.2 ft | — |
| Phosphorus | 13 µg/L | <30 = clean |
| Trophic State Index | 42 | <50 = clean |
How does Flat Lake compare?
Flat Lake's grade of A matches or beats the Minnesota state average of C. It ranks #36 of 102 lakes in Becker County by water quality score. Multi-year monitoring data shows water quality is improving based on 2 years of records.