What is the cleanest lake in Windham County, Vermont?

Lake Raponda in Windham County is the highest-rated lake in Windham County, Vermont with an EPA water quality grade of A and 11.3 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 Windham County, Vermont

Lake Raponda in Windham County leads the rankings with a water quality grade of A and 11.3 ft of clarity. Below are the top 13 cleanest monitored lakes in Windham County, Vermont, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lake Raponda	Windham	A	11.3 ft	10.1 µg/L	2.4 µg/L
2	Lowell Lake	Windham	A	13.5 ft	8.2 µg/L	1.8 µg/L
3	Cole Pond	Windham	A	9.8 ft	9.9 µg/L	2.2 µg/L
4	Grout Pond	Windham	B	8.5 ft	12.5 µg/L	2.9 µg/L
5	Sunset Lake	Windham	B	17.9 ft	10.1 µg/L	1.8 µg/L
6	Haystack Pond	Windham	B	9.6 ft	10.2 µg/L	-
7	Pine Lake	Windham	NR	-	-	-
8	Sadawga Lake	Windham	NR	-	-	-
9	Gates Pond	Windham	NR	-	-	-
10	Burbees Pond	Windham	NR	-	-	-
11	Stratton Pond	Windham	NR	-	-	-
12	Sherman Reservoir	Windham	NR	-	-	-
13	Minards Pond	Windham	NR	-	-	-

Ranked List

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