What is the cleanest lake in Les Basques County, Québec?

Lac Saint-Mathieu in Les Basques County is the cleanest lake on the readings in Les Basques 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 Les Basques County, Québec

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

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lac Saint-Mathieu	Les Basques	—	7.5 ft	8.6 µg/L	4.4 µg/L
2	Petit Lac Saint-Mathieu	Les Basques	—	5.2 ft	12.6 µg/L	3.2 µg/L

Ranked List

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