What is the cleanest lake in Lafayette County, Wisconsin?

Hidden Valley Lake in Lafayette County is the highest-rated lake in Lafayette County, Wisconsin with an EPA water quality grade of D and 5.2 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 Lafayette County, Wisconsin

Hidden Valley Lake in Lafayette County leads the rankings with a water quality grade of D and 5.2 ft of clarity. Below are the top 2 cleanest monitored lakes in Lafayette County, Wisconsin, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Hidden Valley Lake	Lafayette	D	5.2 ft	44.7 µg/L	-
2	Yellowstone Lake	Lafayette	D	1.3 ft	156 µg/L	-

Ranked List

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