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): 5.6 ft. Chlorophyll-a (algae): 7.1 µg/L. Trophic State Index: 51.
Cleanliness Snapshot
| Metric | Arrowhead Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | D |
| Water Clarity (Secchi) | 5.6 ft | — |
| Chlorophyll-a (Algae) | 7.1 µg/L | <10 = clean |
| Trophic State Index | 51 | <50 = clean |
How does Arrowhead Lake compare?
Arrowhead Lake's grade of C matches or beats the Wisconsin state average of D. It ranks #1 of 2 lakes in Sac County by water quality score.