What is the cleanest lake in Humphreys County, Tennessee?

Duck River Lake in Humphreys County is the highest-rated lake in Humphreys County, Tennessee with an EPA water quality grade of D.

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 Humphreys County, Tennessee

Duck River Lake in Humphreys County leads the rankings with a water quality grade of D. Below are the top 2 cleanest monitored lakes in Humphreys County, Tennessee, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Duck River Lake	Humphreys	D	-	200 µg/L	-
2	Kentucky Lake	Humphreys	NR	-	-	-

Ranked List

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