Safest Lakes to Swim Near Wausau
Wisconsin
8 lakes within driving distance of Wausau, Wisconsin pass our swim-safety screen — grade A/B water, low algae, and public access. 0 have direct bacteria (E. coli) testing on record. Filtered for grade A or B water quality, low algae (chlorophyll-a under 15 µg/L), and public access. Always check local advisories on the day you swim.
A moderate cluster of 8 graded lakes lies within reach of Wausau, averaging a grade of B. Unnamed Lake (A) is the cleanest of the set.
Filtered for swimming, the nearby-lake list narrows further. swimming-specific signals — fish species, public access, depth profile, motor-boat congestion — interact with the LakeGrade rubric in different ways depending on the use case.
| # | Lake | County | Grade | Swim Safety | Distance | Clarity | Depth |
|---|---|---|---|---|---|---|---|
| 1 | Unnamed Lake | Portage | A | Limited data | 28.3 mi | - | - |
| 2 | Joanis Lake | Portage | A | Limited data | 29.5 mi | - | - |
| 3 | Glisezinski Lake | Portage | B | Low algae | 22.2 mi | 9 ft | 11 ft |
| 4 | Moose Lake | Langlade | B | Low algae | 29.5 mi | 10 ft | 20 ft |
| 5 | Lake Pesobic | Lincoln | B | Low algae | 17.6 mi | 7 ft | 11 ft |
| 6 | Big Bass Lake | Marathon | B | Low algae | 19 mi | 6 ft | 13 ft |
| 7 | Tree Lake | Portage | B | Low algae | 26.4 mi | 7.4 ft | 33 ft |
| 8 | Unknown Lake | Shawano | B | Low algae | 29 mi | 5 ft | - |
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Source: EPA National Aquatic Resource Surveys, 2026.