What is the cleanest lake in Johnson County, Iowa?

Kent Park Lake in Johnson County is the highest-rated lake in Johnson County, Iowa with an EPA water quality grade of B and 4.8 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 Johnson County, Iowa

Kent Park Lake in Johnson County leads the rankings with a water quality grade of B and 4.8 ft of clarity. Below are the top 3 cleanest monitored lakes in Johnson County, Iowa, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Kent Park Lake	Johnson	B	4.8 ft	25 µg/L	11.4 µg/L
2	Lake Macbride	Johnson	D	2.9 ft	59 µg/L	28.5 µg/L
3	Swan Lake	Johnson	NR	-	-	-

Ranked List

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