Question 1

Cleanest Lakes in Walworth County, Wisconsin?

Accepted Answer

Geneva Lake in Walworth County leads the rankings with a water quality grade of A and 20.2 ft of clarity. Below are the top 23 cleanest monitored lakes in Walworth County, Wisconsin, ranked by EPA water quality score.

Question 2

What is the cleanest lake in Walworth County, Wisconsin?

Accepted Answer

Geneva Lake in Walworth County is the highest-rated lake in Walworth County, Wisconsin with an EPA water quality grade of A and 20.2 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	Geneva Lake	Walworth	A	20.2 ft	13 µg/L	-
2	Geneva Lake	Walworth	A	20.7 ft	13.4 µg/L	-
3	Geneva Lake Site B	Walworth	A	24.1 ft	12.9 µg/L	-
4	Lake Beulah Station 2	Walworth	A	10.8 ft	16.5 µg/L	-
5	Lake Beulah	Walworth	A	11 ft	13 µg/L	-
6	Pleasant Lake	Walworth	A	12 ft	15.1 µg/L	-
7	Green Lake	Walworth	A	11.5 ft	10.5 µg/L	-
8	Turtle Lake	Walworth	A	11.3 ft	14.5 µg/L	-
9	Middle Lake	Walworth	A	10 ft	12.3 µg/L	-
10	Lake Beulah	Walworth	A	10 ft	13.4 µg/L	-
11	Booth Lake	Walworth	B	8 ft	16.4 µg/L	-
12	Mill Lake	Walworth	B	7.5 ft	15.3 µg/L	-
13	Army Lake	Walworth	B	8.2 ft	11.2 µg/L	-
14	Delavan Lake	Walworth	B	9.3 ft	26.5 µg/L	-
15	Delavan Lake	Walworth	B	9.1 ft	27 µg/L	-
16	Peters Lake	Walworth	B	5.6 ft	19.6 µg/L	-
17	Delavan Lake	Walworth	C	10 ft	73 µg/L	-
18	Delavan Lake	Walworth	C	8 ft	49.5 µg/L	-
19	Whitewater Lake	Walworth	C	4 ft	26.2 µg/L	-
20	Potter Lake	Walworth	C	4.3 ft	35 µg/L	-
21	Rice Lake	Walworth	D	1.5 ft	57.2 µg/L	-
22	Comus Lake	Walworth	F	1.5 ft	193 µg/L	-
23	Honey Lake	Walworth	F	2.5 ft	99 µg/L	-

Cleanest Lakes in Walworth County, Wisconsin

Ranked List

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