What is the cleanest lake in Dakota County, Minnesota?

Holland Lake in Dakota County is the highest-rated lake in Dakota County, Minnesota with an EPA water quality grade of A and 27.9 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 Dakota County, Minnesota

Holland Lake in Dakota County leads the rankings with a water quality grade of A and 27.9 ft of clarity. Below are the top 34 cleanest monitored lakes in Dakota County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Holland Lake	Dakota	A	27.9 ft	14 µg/L	3.5 µg/L
2	O'Brien Lake	Dakota	A	18 ft	20 µg/L	4.9 µg/L
3	Sunfish Lake	Dakota	A	9.7 ft	20 µg/L	3.6 µg/L
4	Unnamed Lake	Dakota	C	6 ft	26 µg/L	7.7 µg/L
5	Lemay Lake	Dakota	C	6.9 ft	29 µg/L	4.6 µg/L
6	Fish Lake	Dakota	C	7.2 ft	37 µg/L	9.1 µg/L
7	Blackhawk Lake	Dakota	C	7.9 ft	28 µg/L	5.3 µg/L
8	Crystal Lake	Dakota	C	7 ft	27 µg/L	14.4 µg/L
9	Thomas Lake	Dakota	C	5.6 ft	26.5 µg/L	6.7 µg/L
10	Carlson Lake	Dakota	C	7.5 ft	26 µg/L	8.2 µg/L
11	Schultz Lake	Dakota	C	8.5 ft	23 µg/L	9.5 µg/L
12	Mcdonough Lake	Dakota	C	4.5 ft	30 µg/L	7.7 µg/L
13	East Thomas Lake	Dakota	C	5.6 ft	27 µg/L	8.5 µg/L
14	Bald Lake	Dakota	C	5.6 ft	39 µg/L	8.5 µg/L
15	Jensen Lake	Dakota	C	4.6 ft	28 µg/L	12 µg/L
16	Pitts Lake	Dakota	D	4.9 ft	43 µg/L	8.2 µg/L
17	Keller Lake	Dakota	D	4.1 ft	37.5 µg/L	16.5 µg/L
18	Bur Oaks Pond	Dakota	D	4.6 ft	70 µg/L	9.8 µg/L
19	Gerhardt Lake	Dakota	F	2 ft	50 µg/L	37 µg/L
20	Augusta Lake	Dakota	F	0.7 ft	147.5 µg/L	130 µg/L
21	Unn Pond	Dakota	F	2 ft	135 µg/L	51 µg/L
22	Hilltop Pd Lake	Dakota	F	3.6 ft	97 µg/L	36.7 µg/L
23	Mccarthy Lake	Dakota	F	1 ft	195 µg/L	169.5 µg/L
24	Rice Lake	Dakota	NR	-	-	-
25	Alimagnet Lake	Dakota	NR	-	-	-
26	Lac Lavon Lake	Dakota	NR	-	-	-
27	Kingsley Lake	Dakota	NR	-	-	-
28	Black Dog Lake	Dakota	NR	-	-	-
29	Black Dog Lake	Dakota	NR	-	-	-
30	Kegan Lake	Dakota	NR	-	-	-
31	River Lake	Dakota	NR	-	-	-
32	Lake Isabelle	Dakota	NR	-	-	-
33	Mud Hen Lake	Dakota	NR	-	-	-
34	Rogers Lake	Dakota	NR	-	-	-

Ranked List

More Answers for Dakota County, Minnesota