How Clean Is Fall Lake?
Fall 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): 5.6 ft. Phosphorus: 21 µg/L. Trophic State Index: 50.
Cleanliness Snapshot
| Metric | Fall Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 5.6 ft | — |
| Phosphorus | 21 µg/L | <30 = clean |
| Trophic State Index | 50 | <50 = clean |
How does Fall Lake compare?
Fall Lake's grade of C matches or beats the Minnesota state average of C. It ranks #95 of 142 lakes in Lake County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.