What is the cleanest lake in Cook County, Minnesota?

Clearwater Lake in Cook County is the highest-rated lake in Cook County, Minnesota with an EPA water quality grade of A and 29 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 Cook County, Minnesota

Clearwater Lake in Cook County leads the rankings with a water quality grade of A and 29 ft of clarity. Below are the top 50 cleanest monitored lakes in Cook County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Clearwater Lake	Cook	A	29 ft	4 µg/L	1.3 µg/L
2	Pike Lake	Cook	A	17.4 ft	7 µg/L	2.6 µg/L
3	West Twin Lake	Cook	A	9.8 ft	9 µg/L	3.5 µg/L
4	Trout Lake	Cook	A	18.4 ft	9 µg/L	1.3 µg/L
5	Gull Lake	Cook	A	15.5 ft	8.5 µg/L	2.5 µg/L
6	Caribou Lake	Cook	A	6.9 ft	15 µg/L	6.2 µg/L
7	Devil Track Lake	Cook	A	7 ft	12 µg/L	5.3 µg/L
8	Poplar Lake	Cook	A	10.2 ft	9 µg/L	3.3 µg/L
9	Deer Yard Lake	Cook	A	7.2 ft	15 µg/L	5.3 µg/L
10	Elbow Lake	Cook	A	3.7 ft	18.5 µg/L	4.8 µg/L
11	Hungry Jack Lake	Cook	A	18 ft	7 µg/L	2 µg/L
12	Tom Lake	Cook	A	9 ft	8 µg/L	4.1 µg/L
13	Tait Lake	Cook	A	7 ft	13 µg/L	3.3 µg/L
14	Sea Gull Lake	Cook	A	14.3 ft	7 µg/L	2.7 µg/L
15	Mayhew Lake	Cook	A	20.6 ft	5 µg/L	1.5 µg/L
16	Loon Lake	Cook	A	17.4 ft	5 µg/L	1.6 µg/L
17	Bearskin Lake	Cook	A	21 ft	6 µg/L	1.3 µg/L
18	Saganaga Lake	Cook	A	13 ft	7 µg/L	2.9 µg/L
19	Greenwood Lake	Cook	A	15.1 ft	10 µg/L	2.6 µg/L
20	East Twin Lake	Cook	C	6.2 ft	17 µg/L	7.9 µg/L
21	Lost Lake	Cook	NR	-	-	-
22	Moosehorn Lake	Cook	NR	-	-	-
23	Prout Lake	Cook	NR	-	-	-
24	Otter Lake	Cook	NR	-	-	-
25	Powers Lake	Cook	NR	-	-	-
26	Tom Lake	Cook	NR	-	-	-
27	Triangle Lake	Cook	NR	-	-	-
28	Devilfish Lake	Cook	NR	-	-	-
29	Highlander Lake	Cook	NR	-	-	-
30	Tittle Lake	Cook	NR	-	-	-
31	North Shady Lake	Cook	NR	-	-	-
32	Sunfish Lake	Cook	NR	-	-	-
33	Carrot Lake	Cook	NR	-	-	-
34	Bean Lake	Cook	NR	-	-	-
35	Cucumber Lake	Cook	NR	-	-	-
36	Onion Lake	Cook	NR	-	-	-
37	Jim Lake	Cook	NR	-	-	-
38	Section Ten Lake	Cook	NR	-	-	-
39	Redcoat Lake	Cook	NR	-	-	-
40	Northern Light Lake	Cook	NR	-	-	-
41	Mink Lake	Cook	NR	-	-	-
42	Kimball Lake	Cook	NR	-	-	-
43	Benson Lake	Cook	NR	-	-	-
44	Pickerel Lake	Cook	NR	-	-	-
45	Pine Mountain Lake	Cook	NR	-	-	-
46	Mush Lake	Cook	NR	-	-	-
47	Muckwa Lake	Cook	NR	-	-	-
48	Musquash Lake	Cook	NR	-	-	-
49	Circle Lake	Cook	NR	-	-	-
50	Moses Lake	Cook	NR	-	-	-

Ranked List

More Answers for Cook County, Minnesota