What is the cleanest lake in Charlevoix County, Québec?

Lac Arthabaska in Charlevoix County is the cleanest lake on the readings in Charlevoix County, Québec with an EPA water-quality readings of — and 7.5 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 Charlevoix County, Québec

Lac Arthabaska in Charlevoix County leads the rankings on measured clarity and nutrients and 7.5 ft of clarity. Below are the top 2 cleanest monitored lakes in Charlevoix County, Québec, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lac Arthabaska	Charlevoix	—	7.5 ft	11.6 µg/L	2.8 µg/L
2	Lac des Bois Verts	Charlevoix	—	16.1 ft	3.5 µg/L	1.7 µg/L

Ranked List

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