How Clean Is Arrowhead Lake?
Arrowhead 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): 6.5 ft. Phosphorus: 20.8 µg/L. Trophic State Index: 49.
Cleanliness Snapshot
| Metric | Arrowhead Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 6.5 ft | — |
| Phosphorus | 20.8 µg/L | <30 = clean |
| Trophic State Index | 49 | <50 = clean |
How does Arrowhead Lake compare?
Arrowhead Lake's grade of C matches or beats the Wisconsin state average of C. It ranks #15 of 19 lakes in Adams County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.