Safest Lakes to Swim In in Wisconsin
50 lakes in Wisconsin qualify as safest for swimming, all hold grade A or B and report chlorophyll-a (algae) under 10 µg/L. Always check local advisories on the day you swim.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Geneva Lake | Walworth | A | 20.2 ft | 13 µg/L | - |
| 2 | Round Lake | Sawyer | A | 21.1 ft | 14.4 µg/L | 1 µg/L |
| 3 | Round Lake | Oconto | A | 16.8 ft | 13.8 µg/L | - |
| 4 | Deep Lake | Adams | A | 15.5 ft | 13.3 µg/L | - |
| 5 | Beasley Lake | Waupaca | A | 18.4 ft | 15.1 µg/L | - |
| 6 | Bass Lake | Washburn | A | 16 ft | 12.3 µg/L | - |
| 7 | Bass Lake | Oconto | A | 16.8 ft | 10.7 µg/L | - |
| 8 | Clear Lake | Sawyer | A | 17 ft | 11.2 µg/L | - |
| 9 | Clear Lake | Polk | A | 15.5 ft | 13.9 µg/L | - |
| 10 | Clear Lake | Lincoln | A | 18 ft | 10.6 µg/L | - |
| 11 | Explosion Lake | Oconto | A | 17 ft | 15.7 µg/L | - |
| 12 | Sugar Camp Lake | Oneida | A | 16.5 ft | 10.3 µg/L | - |
| 13 | Little Spider Lake | Vilas | A | 16 ft | 11.5 µg/L | - |
| 14 | Rosalind Lake | Vilas | A | 19.3 ft | 9.9 µg/L | - |
| 15 | Lake Lucerne | Forest | A | 18.5 ft | 9.3 µg/L | - |
| 16 | Two Island Lake | Chippewa | A | 15.3 ft | 15.1 µg/L | - |
| 17 | Long Lake | Bayfield | A | 16.2 ft | 13.7 µg/L | - |
| 18 | Long Lake | Burnett | A | 21.5 ft | 11.3 µg/L | - |
| 19 | Lake Metonga | Forest | A | 22 ft | 14 µg/L | - |
| 20 | Anderson Lake | Vilas | A | 21 ft | 10.4 µg/L | - |
| 21 | Archibald Lake | Oconto | A | 17.6 ft | 10.6 µg/L | - |
| 22 | Carlin Lake | Vilas | A | 21 ft | 7.3 µg/L | - |
| 23 | Wolf Lake | Adams | A | 15 ft | 13.1 µg/L | - |
| 24 | Butternut Lake | Forest | A | 19.5 ft | 11.8 µg/L | - |
| 25 | Green Lake | Oconto | A | 18.3 ft | 17.9 µg/L | - |
| 26 | Stone Lake | Washburn | A | 23 ft | 10.8 µg/L | - |
| 27 | Paya Lake | Oconto | A | 20 ft | 10.5 µg/L | - |
| 28 | Papoose Lake | Vilas | A | 15 ft | 10.4 µg/L | - |
| 29 | Deer Lake | Polk | A | 16 ft | 16.9 µg/L | - |
| 30 | Boot Lake | Oconto | A | 21.5 ft | 11.3 µg/L | - |
| 31 | Eagle Lake | Bayfield | A | 17 ft | 14.3 µg/L | - |
| 32 | White Lake | Marquette | A | 17 ft | 10.8 µg/L | - |
| 33 | White Lake | Langlade | A | 17 ft | 13.5 µg/L | - |
| 34 | Upper Kaubashine Lake | Oneida | A | 19 ft | 12 µg/L | - |
| 35 | Squash Lake | Oneida | A | 17.4 ft | 9.6 µg/L | - |
| 36 | Plummer Lake | Vilas | A | 18 ft | 11.5 µg/L | - |
| 37 | Thunder Lake | Marinette | A | 18 ft | 10.3 µg/L | - |
| 38 | Shell Lake | Washburn | A | 16 ft | 15.2 µg/L | - |
| 39 | Star Lake | Oconto | A | 17 ft | 14.2 µg/L | - |
| 40 | Alva Lake | Oneida | A | 19.5 ft | 11.5 µg/L | - |
| 41 | Franklin Lake | Forest | A | 16 ft | 10.8 µg/L | - |
| 42 | Franklin Lake | Oneida | A | 16.2 ft | 12.3 µg/L | - |
| 43 | Cable Lake | Bayfield | A | 15.5 ft | 14.1 µg/L | - |
| 44 | Viola Lake | Burnett | A | 17 ft | 17.2 µg/L | - |
| 45 | Big Portage Lake | Vilas | A | 18.5 ft | 11.7 µg/L | - |
| 46 | Crystal Lake | Marquette | A | 16.8 ft | 11.5 µg/L | - |
| 47 | Crystal Lake | Sheboygan | A | 19.9 ft | 12.2 µg/L | - |
| 48 | Rinehart Lake | Portage | A | 19 ft | 13.8 µg/L | - |
| 49 | Perch Lake | Oneida | A | 15 ft | 14.5 µg/L | - |
| 50 | Perch Lake | Langlade | A | 17.3 ft | 13.4 µg/L | - |