How Clean Is Half Moon Lake?
Half Moon Lake is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 15.3 ft. Phosphorus: 13.9 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | Half Moon Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | B |
| Water Clarity (Secchi) | 15.3 ft | — |
| Phosphorus | 13.9 µg/L | <30 = clean |
| Trophic State Index | 40 | <50 = clean |
How does Half Moon Lake compare?
Half Moon Lake's grade of B matches or beats the Wisconsin state average of B. It ranks #14 of 55 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.