Lake County Lake Quality
Wisconsin, 3 lakes, average grade A (Excellent)
Only 3 lakes in Lake County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. On average, Lake County lakes grade an A. That puts it near the top of the Ohio county ranking.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Er32 Lake (A) is the cleanest in the county.
Quick Answers for Lake County
Planning a trip? Check special fishing regulations for Er32 Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Lake County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Er32 Lake | A | 20.5 ft | - | - |
| 2 | Er78m Lake | A | 16.4 ft | - | - |
| 3 | Er36 Lake | B | 9 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.