What is the cleanest lake in Chisago County, Minnesota?

Fish Lake in Chisago County is the highest-rated lake in Chisago County, Minnesota with an EPA water quality grade of A and 9.4 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 Chisago County, Minnesota

Fish Lake in Chisago County leads the rankings with a water quality grade of A and 9.4 ft of clarity. Below are the top 50 cleanest monitored lakes in Chisago County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Fish Lake	Chisago	A	9.4 ft	14.5 µg/L	3 µg/L
2	Spider Lake	Chisago	A	6.5 ft	22 µg/L	3.2 µg/L
3	South Lindstrom Lake	Chisago	A	5.6 ft	16 µg/L	6.1 µg/L
4	School Lake	Chisago	A	7.9 ft	20 µg/L	1.8 µg/L
5	Blooms Lake	Chisago	A	6.9 ft	16 µg/L	1.4 µg/L
6	North Lindstrom Lake	Chisago	A	6.9 ft	14.5 µg/L	3.3 µg/L
7	Kroon Lake	Chisago	A	5.9 ft	22 µg/L	5.3 µg/L
8	Little Horseshoe Lake	Chisago	A	7.5 ft	16 µg/L	4.9 µg/L
9	Mattson Lake	Chisago	A	3.9 ft	12 µg/L	1 µg/L
10	Chain Lake	Chisago	A	5.9 ft	16 µg/L	2.7 µg/L
11	Sunrise Lake	Chisago	A	8.4 ft	9.4 µg/L	2.5 µg/L
12	Horseshoe Lake	Chisago	C	4.6 ft	28 µg/L	12.2 µg/L
13	Green Lake	Chisago	C	6 ft	23 µg/L	8.4 µg/L
14	Goose Lake	Chisago	C	4.5 ft	30.5 µg/L	11.5 µg/L
15	South Center Lake	Chisago	C	4.7 ft	29.5 µg/L	14 µg/L
16	Swamp Lake	Chisago	C	1.6 ft	46 µg/L	6 µg/L
17	Comfort Lake	Chisago	D	6 ft	29.5 µg/L	15 µg/L
18	Little Lake	Chisago	D	3 ft	68 µg/L	23 µg/L
19	Chisago Lake	Chisago	D	4 ft	25.5 µg/L	14.9 µg/L
20	North Center Lake	Chisago	D	3 ft	40 µg/L	18 µg/L
21	Rabour Lake	Chisago	D	3 ft	48 µg/L	22.5 µg/L
22	Mandall Lake	Chisago	D	3 ft	57 µg/L	26.4 µg/L
23	Emily Lake	Chisago	F	1.6 ft	145 µg/L	46 µg/L
24	Rush Lake	Chisago	F	3 ft	55.5 µg/L	31.4 µg/L
25	Wallmark Lake	Chisago	F	1.6 ft	89 µg/L	39.5 µg/L
26	Pioneer Lake	Chisago	F	2 ft	82 µg/L	47.8 µg/L
27	Ogrens Lake	Chisago	F	2.6 ft	56 µg/L	35 µg/L
28	Linn Lake	Chisago	F	2 ft	68.5 µg/L	43.4 µg/L
29	Second Lake	Chisago	NR	-	-	-
30	First Lake	Chisago	NR	-	-	-
31	School Lake	Chisago	NR	-	-	-
32	Birch Lake	Chisago	NR	-	-	-
33	Heims Lake	Chisago	NR	-	-	-
34	Mud Lake	Chisago	NR	-	-	-
35	Mud Lake	Chisago	NR	-	-	-
36	Pine Lake	Chisago	NR	-	-	-
37	Mud Lake	Chisago	NR	-	-	-
38	Neander Lake	Chisago	NR	-	-	-
39	Chain Lake	Chisago	NR	-	-	-
40	Indianhead Flowage	Chisago	NR	-	-	-
41	Peterson Slough	Chisago	NR	-	-	-
42	Vibo Lake	Chisago	NR	-	-	-
43	North Pool	Chisago	NR	-	-	-
44	School Lake	Chisago	NR	-	-	-
45	Chisago Lake	Chisago	NR	-	-	-
46	Little Green Lake	Chisago	NR	-	-	-
47	Sam Lake	Chisago	NR	-	-	-
48	White Stone Lake	Chisago	NR	-	-	-
49	Pine Lake	Chisago	NR	-	-	-
50	Spider Lake	Chisago	NR	-	-	-

Ranked List

More Answers for Chisago County, Minnesota