What is the cleanest lake in Durham Region County, Ontario?

Chalk Lake in Durham Region County is the cleanest lake on the readings in Durham Region County, Ontario with an EPA water-quality readings of — and 14.9 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 Durham Region County, Ontario

Chalk Lake in Durham Region County leads the rankings on measured clarity and nutrients and 14.9 ft of clarity. Below are the top 2 cleanest monitored lakes in Durham Region County, Ontario, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Chalk Lake	Durham Region	—	14.9 ft	8.4 µg/L	-
2	Wagner Lake	Durham Region	—	5.4 ft	27.4 µg/L	-

Ranked List

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