What is the cleanest lake in Cass County, Illinois?

Finger Lake in Cass County is the highest-rated lake in Cass County, Illinois 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 Cass County, Illinois

Finger Lake in Cass County leads the rankings with a water quality grade of NR. Below are the top 5 cleanest monitored lakes in Cass County, Illinois, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Finger Lake	Cass	NR	-	-	-
2	Meyers Pond	Cass	NR	-	-	-
3	Swamp Slough	Cass	NR	-	-	-
4	Sangamon Bay	Cass	NR	-	-	-
5	Eagle Lake	Cass	NR	-	-	-

Ranked List

More Answers for Cass County, Illinois