What is the cleanest lake in Marion County, Tennessee?

Tennessee River Lake in Marion County is the highest-rated lake in Marion County, Tennessee with an EPA water quality grade of D and 7.6 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 Marion County, Tennessee

Tennessee River Lake in Marion County leads the rankings with a water quality grade of D and 7.6 ft of clarity. Below are the top 4 cleanest monitored lakes in Marion County, Tennessee, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Tennessee River Lake	Marion	D	7.6 ft	35.4 µg/L	-
2	Clifftops Lake	Marion	NR	-	-	-
3	Laurel Lake	Marion	NR	-	-	-
4	Raccoon Mountain Pumped Storage Dam and Reservoir	Marion	NR	-	-	-

Ranked List

More Answers for Marion County, Tennessee