How Clean Is Island Lake?
Island 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): 30.8 ft. Trophic State Index: 28.
Cleanliness Snapshot
| Metric | Island Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | B |
| Water Clarity (Secchi) | 30.8 ft | — |
| Trophic State Index | 28 | <50 = clean |
How does Island Lake compare?
Island Lake's grade of A matches or beats the Wisconsin state average of B. It ranks #22 of 202 lakes in Vilas County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.