What is the cleanest lake in Douglas County, Minnesota?

Lobster Lake in Douglas County is the highest-rated lake in Douglas County, Minnesota with an EPA water quality grade of A and 13 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 Douglas County, Minnesota

Lobster Lake in Douglas County leads the rankings with a water quality grade of A and 13 ft of clarity. Below are the top 50 cleanest monitored lakes in Douglas County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lobster Lake	Douglas	A	13 ft	20.5 µg/L	3.6 µg/L
2	Latoka Lake	Douglas	A	19 ft	11 µg/L	2.2 µg/L
3	Maple Lake	Douglas	A	14.1 ft	15 µg/L	3.1 µg/L
4	Chippewa Lake	Douglas	A	14.8 ft	14 µg/L	3.5 µg/L
5	Cowdry Lake	Douglas	A	17.1 ft	15 µg/L	2.4 µg/L
6	Vermont Lake	Douglas	A	14.1 ft	12.5 µg/L	4 µg/L
7	Darling Lake	Douglas	A	14 ft	19 µg/L	3.7 µg/L
8	Ida Lake	Douglas	A	16.4 ft	14 µg/L	3 µg/L
9	Miltona Lake	Douglas	A	18.7 ft	18 µg/L	2.9 µg/L
10	Mary Lake	Douglas	A	10.5 ft	20 µg/L	5.5 µg/L
11	Le Homme Dieu Lake	Douglas	A	13.1 ft	21 µg/L	3.7 µg/L
12	Geneva Lake	Douglas	A	14.1 ft	21.5 µg/L	4.9 µg/L
13	Rachel Lake	Douglas	A	7.9 ft	22.5 µg/L	3.9 µg/L
14	Andrew Lake	Douglas	A	13.9 ft	17 µg/L	4 µg/L
15	Lottie Lake	Douglas	A	16.1 ft	15.5 µg/L	2.2 µg/L
16	Carlos Lake	Douglas	A	18 ft	13.5 µg/L	2.1 µg/L
17	Brophy Lake	Douglas	A	15.4 ft	21 µg/L	2.7 µg/L
18	Stoney Lake	Douglas	A	19 ft	13 µg/L	2.8 µg/L
19	Irene Lake	Douglas	B	9.8 ft	24 µg/L	7.4 µg/L
20	Victoria Lake	Douglas	C	10.2 ft	21 µg/L	7.5 µg/L
21	Pocket Lake	Douglas	C	8.5 ft	25 µg/L	7.1 µg/L
22	Henry Lake	Douglas	C	5.9 ft	25 µg/L	12.5 µg/L
23	Agnes Lake	Douglas	D	5.4 ft	37.5 µg/L	15 µg/L
24	Red Rock Lake	Douglas	F	3.6 ft	55 µg/L	33.7 µg/L
25	Stowe Lake	Douglas	F	2.6 ft	94 µg/L	70.3 µg/L
26	Smith Lake	Douglas	F	3.6 ft	58 µg/L	36 µg/L
27	Winona Lake	Douglas	F	2 ft	88 µg/L	48.5 µg/L
28	Stevens Lake	Douglas	NR	-	-	-
29	Clifford Lake	Douglas	NR	-	-	-
30	Gulden Lake	Douglas	NR	-	-	-
31	Herberger Lake	Douglas	NR	-	-	-
32	Kuntz Lake	Douglas	NR	-	-	-
33	English Grove Lake	Douglas	NR	-	-	-
34	Union Lake	Douglas	NR	-	-	-
35	Mud Lake	Douglas	NR	-	-	-
36	Bird Lake	Douglas	NR	-	-	-
37	Kruegers Slough	Douglas	NR	-	-	-
38	Laura Lake	Douglas	NR	-	-	-
39	Lake Charley	Douglas	NR	-	-	-
40	Burrs Lake	Douglas	NR	-	-	-
41	Anderson Lake	Douglas	NR	-	-	-
42	Bjork Lake	Douglas	NR	-	-	-
43	Elk Lake	Douglas	NR	-	-	-
44	Lake Stony	Douglas	NR	-	-	-
45	Lake Connie	Douglas	NR	-	-	-
46	Johnson Lake	Douglas	NR	-	-	-
47	Mud Lake	Douglas	NR	-	-	-
48	Grubb Lake	Douglas	NR	-	-	-
49	Grill Lake	Douglas	NR	-	-	-
50	Skogland Slough	Douglas	NR	-	-	-

Ranked List

More Answers for Douglas County, Minnesota