How Clean Is Mason Lake?
Mason 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 ft. Phosphorus: 21 µg/L. Trophic State Index: 55.
Cleanliness Snapshot
| Metric | Mason Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 3 ft | — |
| Phosphorus | 21 µg/L | <30 = clean |
| Trophic State Index | 55 | <50 = clean |
How does Mason Lake compare?
Mason Lake's grade of C matches or beats the Minnesota state average of C. It ranks #87 of 97 lakes in Otter Tail County by water quality score. Multi-year monitoring data shows water quality is improving based on 2 years of records.