How Clean Is Maple Lake?
Maple 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): 3.4 ft. Phosphorus: 38 µg/L. Trophic State Index: 58.
Cleanliness Snapshot
| Metric | Maple Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 3.4 ft | — |
| Phosphorus | 38 µg/L | <30 = clean |
| Trophic State Index | 58 | <50 = clean |
How does Maple Lake compare?
Maple Lake's grade of C matches or beats the Minnesota state average of C. It ranks #10 of 20 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.