What is the cleanest lake in Joliette County, Québec?

Lac du Rocher in Joliette County is the cleanest lake on the readings in Joliette County, Québec with an EPA water-quality readings of — and 15.1 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 Joliette County, Québec

Lac du Rocher in Joliette County leads the rankings on measured clarity and nutrients and 15.1 ft of clarity. Below are the top 1 cleanest monitored lakes in Joliette County, Québec, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lac du Rocher	Joliette	—	15.1 ft	7.4 µg/L	1.8 µg/L

Ranked List

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