What is the cleanest lake in Grand Isle County, Vermont?

Isle la Motte Lake in Grand Isle County is the highest-rated lake in Grand Isle County, Vermont with an EPA water quality grade of C and 15.1 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 Grand Isle County, Vermont

Isle la Motte Lake in Grand Isle County leads the rankings with a water quality grade of C and 15.1 ft of clarity. Below are the top 1 cleanest monitored lakes in Grand Isle County, Vermont, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Isle la Motte Lake	Grand Isle	C	15.1 ft	19.9 µg/L	3.2 µg/L

Ranked List

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