What is the cleanest lake in Washington County, Wisconsin?

Big Cedar Lake-North Site-Near West Bend in Washington County is the highest-rated lake in Washington County, Wisconsin with an EPA water quality grade of A and 11.8 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 Washington County, Wisconsin

Big Cedar Lake-North Site-Near West Bend in Washington County leads the rankings with a water quality grade of A and 11.8 ft of clarity. Below are the top 16 cleanest monitored lakes in Washington County, Wisconsin, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Big Cedar Lake-North Site-Near West Bend	Washington	A	11.8 ft	17.5 µg/L	3.6 µg/L
2	Green Lake	Washington	B	9 ft	16.6 µg/L	-
3	Little Friess Lake	Washington	B	7.4 ft	26.1 µg/L	-
4	Pike Lake	Washington	B	7 ft	19.3 µg/L	-
5	Bark Lake	Washington	B	5.5 ft	33 µg/L	-
6	Druid Lake	Washington	B	5.5 ft	23.7 µg/L	-
7	Friess Lake	Washington	B	4 ft	32.9 µg/L	-
8	Lake Five	Washington	B	12 ft	14.2 µg/L	-
9	Little Cedar Lake	Washington	B	10.5 ft	12.1 µg/L	-
10	Wallace Lake	Washington	NR	-	-	-
11	Gilbert Lake	Washington	NR	-	-	-
12	Lucas Lake	Washington	NR	-	-	-
13	Silver Lake	Washington	NR	-	-	-
14	Little Cedar Lake	Washington	NR	-	-	-
15	Lake Twelve	Washington	NR	-	-	-
16	Erler Lake	Washington	NR	-	-	-

Ranked List

More Answers for Washington County, Wisconsin