How Clean Is Sylvan Lake?
Sylvan 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): 19.5 ft. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 2.1 µg/L. Trophic State Index: 35.
Cleanliness Snapshot
| Metric | Sylvan Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 19.5 ft | — |
| Phosphorus | 7 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 2.1 µg/L | <10 = clean |
| Trophic State Index | 35 | <50 = clean |
How does Sylvan Lake compare?
Sylvan Lake's grade of A matches or beats the Minnesota state average of C. It ranks #46 of 104 lakes in Cass County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.
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