What is the cleanest lake in Hennepin County, Minnesota?

Pomerleau Lake in Hennepin County is the highest-rated lake in Hennepin County, Minnesota with an EPA water quality grade of A and 10.3 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 Hennepin County, Minnesota

Pomerleau Lake in Hennepin County leads the rankings with a water quality grade of A and 10.3 ft of clarity. Below are the top 50 cleanest monitored lakes in Hennepin County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Pomerleau Lake	Hennepin	A	10.3 ft	20.5 µg/L	3.9 µg/L
2	Sweeney Lake	Hennepin	A	6.9 ft	23 µg/L	5.6 µg/L
3	Riley Lake	Hennepin	A	11.5 ft	24 µg/L	6.5 µg/L
4	Lost Lake	Hennepin	A	3.2 ft	86 µg/L	5.8 µg/L
5	Minnetonka Lake	Hennepin	C	10 ft	28 µg/L	10.1 µg/L
6	Round Lake	Hennepin	C	6.6 ft	39 µg/L	14 µg/L
7	Bryant Lake	Hennepin	C	9.8 ft	37.4 µg/L	4.9 µg/L
8	Fish Lake	Hennepin	C	8.2 ft	29.4 µg/L	6.1 µg/L
9	Bde Maka Ska Lake	Hennepin	C	9.8 ft	88.5 µg/L	5.6 µg/L
10	Harriet Lake	Hennepin	C	9.7 ft	189.5 µg/L	5.4 µg/L
11	Idlewild Lake	Hennepin	C	6.2 ft	36 µg/L	6.9 µg/L
12	Hyland Lake	Hennepin	C	4.9 ft	37.3 µg/L	13.1 µg/L
13	Duck Lake	Hennepin	C	5.9 ft	30 µg/L	5.9 µg/L
14	Little Long Lake	Hennepin	C	18.7 ft	27.5 µg/L	4.8 µg/L
15	Wirth Lake	Hennepin	C	10.1 ft	34 µg/L	5.8 µg/L
16	Meadow Lake	Hennepin	C	3.9 ft	78.5 µg/L	6.2 µg/L
17	Parkers Lake	Hennepin	C	7 ft	52.6 µg/L	6 µg/L
18	Westwood Lake	Hennepin	C	5.6 ft	28.5 µg/L	7.4 µg/L
19	Mud Lake	Hennepin	D	3 ft	196 µg/L	8.5 µg/L
20	Unnamed Lake	Hennepin	D	3.3 ft	58 µg/L	17 µg/L
21	Medicine Lake	Hennepin	D	7.9 ft	73.9 µg/L	9.6 µg/L
22	Twin Lake	Hennepin	D	5.9 ft	80.5 µg/L	23.4 µg/L
23	Whaletail Lake	Hennepin	D	3.3 ft	45.8 µg/L	19.4 µg/L
24	Cedar Lake	Hennepin	D	4.8 ft	84.5 µg/L	12.4 µg/L
25	Mitchell Lake	Hennepin	D	3 ft	68 µg/L	26.9 µg/L
26	Silver Lake	Hennepin	D	5.2 ft	61 µg/L	24.9 µg/L
27	Rice Marsh Lake	Hennepin	D	7.7 ft	44 µg/L	8 µg/L
28	Diamond Lake	Hennepin	D	-	85.5 µg/L	12 µg/L
29	Independence Lake	Hennepin	D	4.8 ft	68.8 µg/L	18.6 µg/L
30	Red Rock Lake	Hennepin	D	2.6 ft	75 µg/L	28.5 µg/L
31	Rebecca Lake	Hennepin	D	4.7 ft	47.4 µg/L	15.5 µg/L
32	Hiawatha Lake	Hennepin	D	3.3 ft	67 µg/L	22.5 µg/L
33	Nokomis Lake	Hennepin	D	4 ft	58 µg/L	25.9 µg/L
34	Spurzem Lake	Hennepin	D	3.3 ft	95.8 µg/L	24.8 µg/L
35	Lake of the Isles	Hennepin	D	5.2 ft	53 µg/L	12.9 µg/L
36	Weaver Lake	Hennepin	D	5 ft	38.7 µg/L	10.6 µg/L
37	Schmidt Lake	Hennepin	D	5.5 ft	60.6 µg/L	14.2 µg/L
38	Brownie Lake	Hennepin	D	5 ft	44 µg/L	17.7 µg/L
39	Peter Lake	Hennepin	D	9.1 ft	72.2 µg/L	8.2 µg/L
40	Forest Lake	Hennepin	D	3.7 ft	48.5 µg/L	23.7 µg/L
41	Grass Lake	Hennepin	D	-	112 µg/L	20.3 µg/L
42	Schwappauf Lake	Hennepin	D	4.4 ft	65.1 µg/L	12.7 µg/L
43	Mud Lake	Hennepin	F	0.9 ft	150 µg/L	123.5 µg/L
44	Long Lake	Hennepin	F	3.3 ft	62 µg/L	32 µg/L
45	Unnamed Lake	Hennepin	F	-	220.5 µg/L	82 µg/L
46	Eagle Lake	Hennepin	F	3 ft	58 µg/L	32.5 µg/L
47	Bass Lake	Hennepin	F	4 ft	34 µg/L	33.2 µg/L
48	Rice Lake	Hennepin	F	2.3 ft	333.8 µg/L	117.9 µg/L
49	Goose Lake	Hennepin	F	0.8 ft	132.1 µg/L	96.5 µg/L
50	Powderhorn Lake	Hennepin	F	1.5 ft	150 µg/L	47.3 µg/L

Ranked List

More Answers for Hennepin County, Minnesota