What is the cleanest lake in Washington County, Vermont?

Berlin Pond in Washington County is the highest-rated lake in Washington County, Vermont with an EPA water quality grade of A and 21.7 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 Washington County, Vermont

Berlin Pond in Washington County leads the rankings with a water quality grade of A and 21.7 ft of clarity. Below are the top 20 cleanest monitored lakes in Washington County, Vermont, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Berlin Pond	Washington	A	21.7 ft	7.1 µg/L	1.1 µg/L
2	Sabin Pond	Washington	A	15.7 ft	9.7 µg/L	2.1 µg/L
3	Curtis Pond	Washington	A	15.3 ft	13.2 µg/L	3.2 µg/L
4	Lake Mirror	Washington	A	21.3 ft	10.8 µg/L	2.6 µg/L
5	Lake Greenwood	Washington	A	18 ft	11.1 µg/L	3.3 µg/L
6	Forest Lake	Washington	A	25.6 ft	7 µg/L	1.2 µg/L
7	Waterbury Reservoir	Washington	A	-	9.1 µg/L	2.6 µg/L
8	Valley Lake	Washington	C	24.4 ft	17.2 µg/L	2.9 µg/L
9	Wrightsville Reservoir	Washington	NR	-	-	-
10	Bancroft Pond	Washington	NR	-	-	-
11	North Montpelier Pond	Washington	NR	-	-	-
12	Sodom Pond	Washington	NR	-	-	-
13	Adamant Pond	Washington	NR	-	-	-
14	Bliss Pond	Washington	NR	-	-	-
15	Worcester Ponds	Washington	NR	-	-	-
16	Greenwood Lake	Washington	NR	-	-	-
17	Buck Lake	Washington	NR	-	-	-
18	Sabin Pond	Washington	NR	-	-	-
19	West Hill Pond	Washington	NR	-	-	-
20	Mollys Pond	Washington	NR	-	-	-

Ranked List

More Answers for Washington County, Vermont