What is the cleanest lake in Portage County, Wisconsin?

Lake Emily in Portage County is the highest-rated lake in Portage County, Wisconsin with an EPA water quality grade of B and 11 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 Portage County, Wisconsin

Lake Emily in Portage County leads the rankings with a water quality grade of B and 11 ft of clarity. Below are the top 21 cleanest monitored lakes in Portage County, Wisconsin, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lake Emily	Portage	B	11 ft	16.9 µg/L	-
2	Rinehart Lake	Portage	B	19 ft	13.8 µg/L	-
3	Sunset Lake	Portage	B	13.3 ft	13.1 µg/L	-
4	Tree Lake	Portage	B	7.4 ft	20.1 µg/L	-
5	Glisezinski Lake	Portage	B	9 ft	16.4 µg/L	-
6	Collins Lake	Portage	B	6.5 ft	20.6 µg/L	-
7	Lake Helen	Portage	B	8 ft	19.2 µg/L	-
8	Onland Lake	Portage	B	10.5 ft	12.8 µg/L	-
9	Springville Pond	Portage	B	9 ft	18.8 µg/L	-
10	Mcdill Pond	Portage	C	5 ft	34.1 µg/L	-
11	Spring Lake	Portage	C	8.8 ft	29.9 µg/L	-
12	Bass Lake	Portage	NR	-	-	-
13	Washburn Lake	Portage	NR	-	-	-
14	Lions Lake	Portage	NR	-	-	-
15	Bentley Pond	Portage	NR	-	-	-
16	VanOrder Pond	Portage	NR	-	-	-
17	Bakers Lake	Portage	NR	-	-	-
18	Hintz Lake	Portage	NR	-	-	-
19	Reton Lake	Portage	NR	-	-	-
20	Wisconsin River Flowage	Portage	NR	-	-	-
21	Little Eau Pleine Flowage	Portage	NR	-	-	-

Ranked List

More Answers for Portage County, Wisconsin