What is the cleanest lake in Les Collines-de-l'Outaouais County, Québec?

Lac Johnston in Les Collines-de-l'Outaouais County is the cleanest lake on the readings in Les Collines-de-l'Outaouais County, Québec with an EPA water-quality readings of — and 12.1 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 Les Collines-de-l'Outaouais County, Québec

Lac Johnston in Les Collines-de-l'Outaouais County leads the rankings on measured clarity and nutrients and 12.1 ft of clarity. Below are the top 10 cleanest monitored lakes in Les Collines-de-l'Outaouais County, Québec, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Lac Johnston	Les Collines-de-l'Outaouais	—	12.1 ft	9.7 µg/L	3.1 µg/L
2	Lac des Loups	Les Collines-de-l'Outaouais	—	13.5 ft	6.9 µg/L	2.2 µg/L
3	Lac Mahon	Les Collines-de-l'Outaouais	—	11.5 ft	10.3 µg/L	4.2 µg/L
4	Lac Bernard	Les Collines-de-l'Outaouais	—	15.4 ft	5.5 µg/L	1.7 µg/L
5	Lac Sinclair	Les Collines-de-l'Outaouais	—	17.1 ft	4.4 µg/L	1.7 µg/L
6	Lac Lacaille	Les Collines-de-l'Outaouais	—	18 ft	4 µg/L	1.7 µg/L
7	Lac à la Perdrix	Les Collines-de-l'Outaouais	—	25.6 ft	4.6 µg/L	1.3 µg/L
8	Lac Gauvreau	Les Collines-de-l'Outaouais	—	7.7 ft	15.4 µg/L	7.3 µg/L
9	Lac Jean-Venne	Les Collines-de-l'Outaouais	—	11.8 ft	8.6 µg/L	3.8 µg/L
10	Lac Teeples	Les Collines-de-l'Outaouais	—	21.5 ft	5.6 µg/L	1.3 µg/L

Ranked List

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