Question 1

Cleanest Lakes in Waukesha County, Wisconsin?

Accepted Answer

Silver Lake in Waukesha County leads the rankings with a water quality grade of A and 36.9 ft of clarity. Below are the top 31 cleanest monitored lakes in Waukesha County, Wisconsin, ranked by EPA water quality score.

Question 2

What is the cleanest lake in Waukesha County, Wisconsin?

Accepted Answer

Silver Lake in Waukesha County is the highest-rated lake in Waukesha County, Wisconsin with an EPA water quality grade of A and 36.9 feet of water clarity.

Question 3

How are these rankings calculated?

Accepted Answer

Lakes are graded A through F using the Metropolitan Council methodology, which combines Secchi depth (water clarity), total phosphorus, and chlorophyll-a (algae) into a single score. Source data comes from the EPA Water Quality Portal.

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Silver Lake	Waukesha	A	36.9 ft	11.8 µg/L	-
2	Lac la Belle Lake	Waukesha	A	16.4 ft	14.7 µg/L	-
3	Pewaukee Lake	Waukesha	A	18.9 ft	19.9 µg/L	-
4	Pine Lake	Waukesha	A	82 ft	11.9 µg/L	-
5	Hunters Lake	Waukesha	A	32.8 ft	15.9 µg/L	-
6	Lake Keesus	Waukesha	A	26.1 ft	15.8 µg/L	-
7	Nagawicka Lake	Waukesha	A	23.2 ft	13.5 µg/L	-
8	Pretty Lake	Waukesha	A	39.4 ft	12.2 µg/L	-
9	Upper Nemahbin Lake	Waukesha	A	42.7 ft	13.7 µg/L	-
10	Lower Nashotah Lake	Waukesha	A	29.5 ft	11.3 µg/L	-
11	Ottawa Lake	Waukesha	A	42.7 ft	15 µg/L	-
12	Golden Lake	Waukesha	A	42.7 ft	14.1 µg/L	-
13	North Lake	Waukesha	A	29.5 ft	17.9 µg/L	-
14	Okauchee Lake	Waukesha	A	36.1 ft	17.1 µg/L	-
15	Oconomowoc Lake	Waukesha	A	42.7 ft	11.7 µg/L	-
16	Ashippun Lake	Waukesha	A	32.8 ft	12.8 µg/L	-
17	Crooked Lake	Waukesha	A	25.4 ft	16.5 µg/L	-
18	Fowler Lake	Waukesha	A	49.2 ft	15.6 µg/L	-
19	Lower Nemahbin Lake	Waukesha	A	36.1 ft	11 µg/L	-
20	Lower Phantom Lake	Waukesha	A	19.3 ft	15.7 µg/L	-
21	Oconomowoc Lake Site	Waukesha	A	39.4 ft	13.8 µg/L	-
22	Oconomowoc Lake 2	Waukesha	A	14.6 ft	15.5 µg/L	-
23	Oconomowoc Lake No. 1	Waukesha	A	13.8 ft	16 µg/L	-
24	Okauchee Lake	Waukesha	A	11.3 ft	18 µg/L	-
25	School Section Lake	Waukesha	A	16.7 ft	26.2 µg/L	-
26	Denoon Lake	Waukesha	A	29.5 ft	25.3 µg/L	-
27	Eagle Spring Lake	Waukesha	A	14.7 ft	17.9 µg/L	-
28	Okauchee Lake-Site No. 2-at Okauchee	Waukesha	B	5.9 ft	18 µg/L	-
29	Okauchee Lake Site	Waukesha	B	5.9 ft	19 µg/L	-
30	Okauchee Lake Deep Hole Usgs	Waukesha	B	7.5 ft	23.7 µg/L	-
31	Ocauchee Lake	Waukesha	B	6.6 ft	17.5 µg/L	-

Cleanest Lakes in Waukesha County, Wisconsin

Ranked List

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