What is the cleanest lake in Walworth County, Wisconsin?

Lake Beulah in Walworth County is the highest-rated lake in Walworth County, Wisconsin with an EPA water quality grade of A and 10 feet of water clarity.

How are these rankings calculated?

Lakes are graded A through F on nutrients and algae — total phosphorus, nitrogen, chlorophyll-a, and turbidity — against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown; it is not the letter. Lakes without enough recent samples are UNRATED, not given an F. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Walworth County, Wisconsin

Lake Beulah in Walworth County leads the rankings with a water quality grade of A and 10 ft of clarity. Below are the top 18 cleanest monitored lakes in Walworth County, Wisconsin, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lake Beulah	Walworth	A	10 ft	13.4 µg/L	2.5 µg/L
2	Geneva Lake	Walworth	A	21 ft	13 µg/L	2.1 µg/L
3	Green Lake	Walworth	B	11 ft	10.7 µg/L	-
4	Pleasant Lake	Walworth	B	12 ft	15.1 µg/L	-
5	Booth Lake	Walworth	B	8 ft	15.9 µg/L	-
6	Whitewater Lake	Walworth	B	4 ft	26.2 µg/L	-
7	Turtle Lake	Walworth	B	11 ft	15.2 µg/L	-
8	Middle Lake	Walworth	B	10 ft	12.8 µg/L	-
9	Mill Lake	Walworth	B	7.5 ft	15.3 µg/L	-
10	Delavan Lake	Walworth	C	8.9 ft	52.5 µg/L	9.1 µg/L
11	Lake Lorraine	Walworth	C	-	48.9 µg/L	-
12	Rice Lake	Walworth	D	1.7 ft	60.3 µg/L	-
13	Honey Lake	Walworth	D	2.5 ft	89.6 µg/L	-
14	Lake Como	Walworth	NR	-	-	-
15	Goose Pond	Walworth	NR	-	-	-
16	Pell Lake	Walworth	NR	-	-	-
17	Tombeau Lake	Walworth	NR	-	-	-
18	Lulu Lake	Walworth	NR	-	-	-

Ranked List

More Answers for Walworth County, Wisconsin