How Clean Is Half Moon Lake?
Half Moon Lake is among the cleanest lakes in Wisconsin. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 50 ft. Phosphorus: 13.9 µg/L. Trophic State Index: 31.
Cleanliness Snapshot
| Metric | Half Moon Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | B |
| Water Clarity (Secchi) | 50 ft | — |
| Phosphorus | 13.9 µg/L | <30 = clean |
| Trophic State Index | 31 | <50 = clean |
How does Half Moon Lake compare?
Half Moon Lake's grade of A matches or beats the Wisconsin state average of B. It ranks #17 of 77 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is stable based on 7 years of records.