What is the cleanest lake in Manitoulin District County, Ontario?

Big Lake in Manitoulin District County is the cleanest lake on the readings in Manitoulin District County, Ontario with an EPA water-quality readings of — and 9.2 feet of water clarity.

How are these rankings calculated?

Nutrients and algae, total phosphorus, nitrogen, chlorophyll-a and turbidity, are read 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 Manitoulin District County, Ontario

Big Lake in Manitoulin District County leads the rankings on measured clarity and nutrients and 9.2 ft of clarity. Below are the top 10 cleanest monitored lakes in Manitoulin District County, Ontario, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Big Lake	Manitoulin District	—	9.2 ft	7.5 µg/L	-
2	Ice Lake	Manitoulin District	—	6.6 ft	11.9 µg/L	-
3	Kagawong Lake	Manitoulin District	—	24.4 ft	7.1 µg/L	-
4	Manitou Lake	Manitoulin District	—	21.3 ft	6.8 µg/L	-
5	Mindemoya Lake	Manitoulin District	—	13.6 ft	7.2 µg/L	-
6	Nameless Lake	Manitoulin District	—	16.1 ft	4.1 µg/L	-
7	North Channel Lake	Manitoulin District	—	16.4 ft	8.8 µg/L	-
8	Tobacco Lake	Manitoulin District	—	10.5 ft	6.3 µg/L	-
9	Windfall Lake	Manitoulin District	—	14.8 ft	7.2 µg/L	-
10	Wolsey Lake	Manitoulin District	—	9.2 ft	10.6 µg/L	-

Ranked List

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