Greene County Lake Quality
Wisconsin, 1 lakes, average grade D (Poor)
Only 1 lakes in Greene 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. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Sleepy Hollow Lake (D); the most-stressed is Sleepy Hollow Lake (D).
Quick Answers for Greene County
Planning a trip? Check special fishing regulations for Sleepy Hollow Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Greene County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Sleepy Hollow Lake | D | 5.9 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.