Updated August 2026
Cleanest Lakes
The cleanest lakes on nutrient and algae readings in Minnesota and Wisconsin
Snapshot
Adams Lake in Vilas, WI has the cleanest readings, with a trophic state index of -6.
| # | Name | Metric |
|---|---|---|
| 1 | Adams Lake TSI -6 (oligotrophic), Vilas, WI | -6 |
| 2 | Clear Lake TSI 8 (oligotrophic), Rock, WI | 8 |
| 3 | Sealion Lake TSI 13 (oligotrophic), Florence, WI | 13 |
| 4 | Lily Lake TSI 14 (oligotrophic), Marinette, WI | 14 |
| 5 | Crystal Lake TSI 14 (oligotrophic), Oneida, WI | 14 |
| 6 | Clara Lake-Deep Hole TSI 14 (oligotrophic), Lincoln, WI | 14 |
| 7 | Big Hurst Lake TSI 14 (oligotrophic), Vilas, WI | 14 |
| 8 | Millicent Lake TSI 15 (oligotrophic), Bayfield, WI | 15 |
| 9 | Roach Lake TSI 15 (oligotrophic), Vilas, WI | 15 |
| 10 | Fountain Lake TSI 15 (oligotrophic), Portage, WI | 15 |
Adams Lake in Vilas, WI has the cleanest readings, with a trophic state index of -6.
Frequently Asked Questions
This report is auto-generated from real public data sources. Entities are ranked by their key metrics and the most notable changes and extremes are highlighted.
The underlying data is refreshed on a regular schedule. This report was generated from the most recent available data (last updated August 2026).
The primary metric varies by report type. It may represent a score, dollar amount, rate, or count depending on what the report is measuring.
Source: EPA National Aquatic Resource Surveys, 2026.