How Clean Is South Twin Lake?
South Twin Lake is among the cleanest lakes in Wisconsin. It received a water quality grade of A (Excellent) based on EPA monitoring data. Phosphorus: 11.7 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | South Twin Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Phosphorus | 11.7 µg/L | <30 = clean |
| Trophic State Index | 40 | <50 = clean |
How does South Twin Lake compare?
South Twin Lake's grade of A matches or beats the Wisconsin state average of C. It ranks #7 of 73 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.