What is the cleanest lake in Stanley County, South Dakota?

Hayes Lake in Stanley County is the highest-rated lake in Stanley County, South Dakota with an EPA water quality grade of NR.

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 Stanley County, South Dakota

Hayes Lake in Stanley County leads the rankings with a water quality grade of NR. Below are the top 1 cleanest monitored lakes in Stanley County, South Dakota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Hayes Lake	Stanley	NR	-	-	-

Ranked List

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