What is the cleanest lake in Cerro Gordo County, Iowa?

Blue Pit Lake in Cerro Gordo County is the highest-rated lake in Cerro Gordo County, Iowa with an EPA water quality grade of A and 17.1 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 Cerro Gordo County, Iowa

Blue Pit Lake in Cerro Gordo County leads the rankings with a water quality grade of A and 17.1 ft of clarity. Below are the top 6 cleanest monitored lakes in Cerro Gordo County, Iowa, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Blue Pit Lake	Cerro Gordo	A	17.1 ft	20 µg/L	2.4 µg/L
2	Clear Lake	Cerro Gordo	D	2.1 ft	52 µg/L	26.4 µg/L
3	Black Pit Lake	Cerro Gordo	F	5.6 ft	55.3 µg/L	39.7 µg/L
4	Fin And Feather Lake	Cerro Gordo	F	2.3 ft	112 µg/L	42 µg/L
5	Zerbel Slough	Cerro Gordo	NR	-	-	-
6	Mallard Marsh Swamp	Cerro Gordo	NR	-	-	-

Ranked List

More Answers for Cerro Gordo County, Iowa