What is the cleanest lake in Jefferson County, Wisconsin?

Rock Lake in Jefferson County has the cleanest nutrient and algae readings in Jefferson County, Wisconsin, with 12 feet of measured water clarity.

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 separately. Lakes without enough recent samples are listed without a condition class rather than ranked low. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Jefferson County, Wisconsin

Rock Lake in Jefferson County leads the rankings on measured clarity and nutrients and 12 ft of clarity. Below are the top 14 cleanest monitored lakes in Jefferson County, Wisconsin, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Rock Lake	Jefferson	12 ft	18.1 µg/L	-
2	Red Cedar Lake	Jefferson	4 ft	23.4 µg/L	-
3	Lake Ripley	Jefferson	9 ft	21.8 µg/L	-
4	Blue Spring Lake	Jefferson	6.2 ft	24.7 µg/L	-
5	Lower Spring Lake	Jefferson	4 ft	44.1 µg/L	-
6	Mud Lake	Jefferson	2.3 ft	63.6 µg/L	-
7	Lake Koshkonong	Jefferson	1.7 ft	287 µg/L	-
8	Hahns Lake	Jefferson	-	-	-
9	Goose Lake	Jefferson	-	-	-
10	Rome Pond	Jefferson	-	-	-
11	Cushman Pond	Jefferson	-	-	-
12	Green Isle Lake	Jefferson	-	-	-
13	Bean Lake	Jefferson	-	-	-
14	Mud Lake	Jefferson	-	-	-

Ranked List

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