What is the cleanest lake in Leeds and Grenville Counties County, Ontario?

Crosby Lake in Leeds and Grenville Counties County is the cleanest lake on the readings in Leeds and Grenville Counties County, Ontario with an EPA water-quality readings of — and 17.1 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 Leeds and Grenville Counties County, Ontario

Crosby Lake in Leeds and Grenville Counties County leads the rankings on measured clarity and nutrients and 17.1 ft of clarity. Below are the top 32 cleanest monitored lakes in Leeds and Grenville Counties County, Ontario, ranked by EPA water quality score.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Crosby Lake	Leeds and Grenville Counties	—	17.1 ft	9.9 µg/L	-
2	Bass Lake	Leeds and Grenville Counties	—	19.4 ft	13.9 µg/L	-
3	Bass Lake	Leeds and Grenville Counties	—	19 ft	6.3 µg/L	-
4	Benson Lake	Leeds and Grenville Counties	—	10.2 ft	14.1 µg/L	-
5	Big Rideau Lake	Leeds and Grenville Counties	—	18.9 ft	9.7 µg/L	-
6	Charleston Lake	Leeds and Grenville Counties	—	19.7 ft	9.6 µg/L	-
7	Clear Lake	Leeds and Grenville Counties	—	14.6 ft	13.9 µg/L	-
8	Gananoque Lake	Leeds and Grenville Counties	—	10.5 ft	19.5 µg/L	-
9	Gananoque River Lake	Leeds and Grenville Counties	—	10.5 ft	17.5 µg/L	-
10	Graham Lake	Leeds and Grenville Counties	—	8.2 ft	13 µg/L	-
11	Grippen Lake	Leeds and Grenville Counties	—	13.1 ft	11.8 µg/L	-
12	Higley Lake	Leeds and Grenville Counties	—	15.4 ft	11.2 µg/L	-
13	Indian Lake	Leeds and Grenville Counties	—	15.7 ft	12.6 µg/L	-
14	Killenbeck Lake	Leeds and Grenville Counties	—	7.9 ft	21.8 µg/L	-
15	Little Cranberry Lake	Leeds and Grenville Counties	—	8.2 ft	44.7 µg/L	-
16	Little Crosby Lake	Leeds and Grenville Counties	—	9.5 ft	9.4 µg/L	-
17	Long Lake	Leeds and Grenville Counties	—	10.2 ft	13.7 µg/L	-
18	Lower Beverley Lake	Leeds and Grenville Counties	—	9.8 ft	18.8 µg/L	-
19	Lyndhurst Lake	Leeds and Grenville Counties	—	9.8 ft	24.7 µg/L	-
20	Newboro Lake	Leeds and Grenville Counties	—	14.8 ft	17 µg/L	-
21	Otter Lake	Leeds and Grenville Counties	—	14.9 ft	9.3 µg/L	-
22	Red Horse Lake	Leeds and Grenville Counties	—	13.1 ft	17.6 µg/L	-
23	Sand Lake	Leeds and Grenville Counties	—	16.4 ft	13.6 µg/L	-
24	Singleton Lake	Leeds and Grenville Counties	—	8.9 ft	18.5 µg/L	-
25	South Lake	Leeds and Grenville Counties	—	4.9 ft	26.1 µg/L	-
26	St Lawrence River Lake	Leeds and Grenville Counties	—	31.2 ft	10.1 µg/L	-
27	Temperance Lake	Leeds and Grenville Counties	—	5.9 ft	17.9 µg/L	-
28	Tommy Lake	Leeds and Grenville Counties	—	11.6 ft	19.5 µg/L	-
29	Troy Lake	Leeds and Grenville Counties	—	5.6 ft	24 µg/L	-
30	Upper Beverley Lake	Leeds and Grenville Counties	—	8.5 ft	18.3 µg/L	-
31	Upper Rideau Lake	Leeds and Grenville Counties	—	12.5 ft	20 µg/L	-
32	Whitefish Lake	Leeds and Grenville Counties	—	12.1 ft	14.7 µg/L	-

Ranked List

More Answers for Leeds and Grenville Counties County, Ontario