What is the cleanest lake in Addison County, Vermont?

Lake Dunmore in Addison County is the highest-rated lake in Addison County, Vermont with an EPA water quality grade of A and 16.4 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 Addison County, Vermont

Lake Dunmore in Addison County leads the rankings with a water quality grade of A and 16.4 ft of clarity. Below are the top 5 cleanest monitored lakes in Addison County, Vermont, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lake Dunmore	Addison	A	16.4 ft	10.9 µg/L	2.9 µg/L
2	Otter Creek Section Lake	Addison	C	9.8 ft	14.3 µg/L	6.1 µg/L
3	Port Henry Section Lake	Addison	C	10.8 ft	13.3 µg/L	5.9 µg/L
4	Fern Lake	Addison	C	20.7 ft	19 µg/L	5.3 µg/L
5	Johnson Pond	Addison	NR	-	-	-

Ranked List

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