What is the cleanest lake in Delaware County, New York?

Sexsmith Lake in Delaware County is the highest-rated lake in Delaware County, New York 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 Delaware County, New York

Sexsmith Lake in Delaware County leads the rankings with a water quality grade of NR. Below are the top 16 cleanest monitored lakes in Delaware County, New York, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Sexsmith Lake	Delaware	NR	-	-	-
2	Odell Lake	Delaware	NR	-	-	-
3	Titus Lake	Delaware	NR	-	-	-
4	Lake Delaware	Delaware	NR	-	-	-
5	Pepacton Reservoir	Delaware	NR	-	-	-
6	Perch Lake	Delaware	NR	-	-	-
7	Wawaka Lake	Delaware	NR	-	-	-
8	Big Pond	Delaware	NR	-	-	-
9	Sand Pond	Delaware	NR	-	-	-
10	Cables Lake	Delaware	NR	-	-	-
11	Silver Lake	Delaware	NR	-	-	-
12	Black Ash Swamp	Delaware	NR	-	-	-
13	Crystal Lake	Delaware	NR	-	-	-
14	Perkins Pond	Delaware	NR	-	-	-
15	Cannonsville Reservoir	Delaware	NR	-	-	-
16	East Sidney Lake	Delaware	NR	-	-	-

Ranked List

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