What is the cleanest lake in Ransom County, North Dakota?

Lone Tree Lake in Ransom County is the highest-rated lake in Ransom County, North 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 Ransom County, North Dakota

Lone Tree Lake in Ransom County leads the rankings with a water quality grade of NR. Below are the top 2 cleanest monitored lakes in Ransom County, North Dakota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lone Tree Lake	Ransom	NR	-	-	-
2	Browen Lake	Ransom	NR	-	-	-

Ranked List

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