What is the cleanest lake in Delaware County, Ohio?

Delaware Lake in Delaware County is the cleanest lake on the readings in Delaware County, Ohio with an EPA water-quality readings of —.

How are these rankings calculated?

Nutrients and algae, total phosphorus, nitrogen, chlorophyll-a and turbidity, are read 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, Ohio

Delaware Lake in Delaware County leads the rankings on measured clarity and nutrients. Below are the top 2 cleanest monitored lakes in Delaware County, Ohio, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Delaware Lake	Delaware	—	-	-	-
2	Westerville Reservoir	Delaware	—	-	-	-

Ranked List

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