Cleanest Lakes in Waukesha County, Wisconsin
Pine Lake in Waukesha County leads the rankings with a water quality grade of A and 25 ft of clarity. Below are the top 28 cleanest monitored lakes in Waukesha County, Wisconsin, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Pine Lake | Waukesha | A | 25 ft | 11.5 µg/L | - |
| 2 | Okauchee Lake | Waukesha | A | 11.3 ft | 18 µg/L | - |
| 3 | Silver Lake | Waukesha | A | 10 ft | 11.8 µg/L | - |
| 4 | Ottawa Lake | Waukesha | A | 13 ft | 15 µg/L | - |
| 5 | Ashippun Lake | Waukesha | A | 10 ft | 12.8 µg/L | - |
| 6 | Pretty Lake | Waukesha | A | 12.2 ft | 12.2 µg/L | - |
| 7 | Oconomowoc Lake | Waukesha | A | 13 ft | 11.7 µg/L | - |
| 8 | Oconomowoc Lake Site | Waukesha | A | 13 ft | 13.8 µg/L | - |
| 9 | Lower Nemahbin Lake | Waukesha | A | 10.9 ft | 10.9 µg/L | - |
| 10 | Fowler Lake | Waukesha | A | 14.5 ft | 15.6 µg/L | - |
| 11 | Upper Nemahbin Lake | Waukesha | A | 12 ft | 13.7 µg/L | - |
| 12 | Okauchee Lake | Waukesha | A | 12 ft | 17.1 µg/L | - |
| 13 | Golden Lake | Waukesha | A | 12.8 ft | 14.1 µg/L | - |
| 14 | Crooked Lake | Waukesha | B | 8 ft | 16.5 µg/L | - |
| 15 | North Lake | Waukesha | B | 8 ft | 17.9 µg/L | - |
| 16 | Pewaukee Lake | Waukesha | B | 7.5 ft | 19.9 µg/L | - |
| 17 | Hunters Lake | Waukesha | B | 9.5 ft | 15.9 µg/L | - |
| 18 | Lake Keesus | Waukesha | B | 9.2 ft | 15.8 µg/L | - |
| 19 | Lower Nashotah Lake | Waukesha | B | 9 ft | 11.3 µg/L | - |
| 20 | Nagawicka Lake | Waukesha | B | 9.5 ft | 13.5 µg/L | - |
| 21 | Lower Phantom Lake | Waukesha | B | 6.7 ft | 15.7 µg/L | - |
| 22 | Lac la Belle Lake | Waukesha | B | 4.8 ft | 14.7 µg/L | - |
| 23 | Eagle Spring Lake | Waukesha | B | 4.3 ft | 17.9 µg/L | - |
| 24 | Denoon Lake | Waukesha | B | 9 ft | 25.3 µg/L | - |
| 25 | Okauchee Lake Site | Waukesha | B | 5.9 ft | 19 µg/L | - |
| 26 | Okauchee Lake Deep Hole Usgs | Waukesha | B | 7.5 ft | 23.7 µg/L | - |
| 27 | Ocauchee Lake | Waukesha | B | 6.6 ft | 17.5 µg/L | - |
| 28 | School Section Lake | Waukesha | C | 6.2 ft | 26.2 µg/L | - |