What is the cleanest lake in Decatur County, Tennessee?

Beech River Lake in Decatur County is the highest-rated lake in Decatur 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 Decatur County, Tennessee

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

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Beech River Lake	Decatur	D	-	96 µg/L	-
2	Kentucky Lake	Decatur	NR	-	-	-

Ranked List

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