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

Ithaca Reservoir in Tompkins County is the highest-rated lake in Tompkins 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 Tompkins County, New York

Ithaca Reservoir in Tompkins County leads the rankings with a water quality grade of NR. Below are the top 3 cleanest monitored lakes in Tompkins County, New York, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Ithaca Reservoir	Tompkins	NR	-	-	-
2	Dryden Lake	Tompkins	NR	-	-	-
3	Jennings Pond	Tompkins	NR	-	-	-

Ranked List

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