What is the cleanest lake in Delaware County, Iowa?

Silver Lake Max Depth in Delaware County is the highest-rated lake in Delaware County, Iowa with an EPA water quality grade of F and 2.4 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 Delaware County, Iowa

Silver Lake Max Depth in Delaware County leads the rankings with a water quality grade of F and 2.4 ft of clarity. Below are the top 4 cleanest monitored lakes in Delaware County, Iowa, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Silver Lake Max Depth	Delaware	F	2.4 ft	152 µg/L	37.6 µg/L
2	Backbone Lake	Delaware	NR	-	-	-
3	Hartwick Lake	Delaware	NR	-	-	-
4	Quaker Mill Pond	Delaware	NR	-	-	-

Ranked List

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