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LakeQuality

Safest Lakes to Swim In in Ontario

50 lakes in Ontario qualify as safest for swimming, all hold grade A or B and report chlorophyll-a (algae) under 10 µg/L. Always check local advisories on the day you swim.

Ranked List

#LakeCountyGradeClarityPhosphorusAlgae
1Crosby LakeLeeds and Grenville CountiesA17.1 ft9.9 µg/L-
2Allen LakeHaliburtonA19.4 ft5 µg/L-
3Animoosh LakeNipissing DistrictA15.6 ft11.8 µg/L-
4Anstruther LakePeterboroughA16.4 ft6.2 µg/L-
5Ardoch LakeFrontenacA19 ft6.8 µg/L-
6Armstrong LakeSudbury DistrictA15.1 ft6.1 µg/L-
7Arnott LakeAlgoma DistrictA24 ft4.6 µg/L-
8Arrow LakeThunder Bay DistrictA24 ft7.5 µg/L-
9Aylen LakeNipissing DistrictA17.9 ft3.3 µg/L-
10Bagot Long LakeRenfrewA15.1 ft13.5 µg/L-
11Bass LakeLeeds and Grenville CountiesA19.4 ft13.9 µg/L-
12Bass LakeLeeds and Grenville CountiesA19 ft6.3 µg/L-
13Basswood LakeAlgoma DistrictA37.7 ft2.8 µg/L-
14Bay LakeHastingsA21.2 ft18.9 µg/L-
15Beech LakeHaliburtonA15.9 ft8.9 µg/L-
16Bella LakeMuskoka DistrictA16.4 ft7.6 µg/L-
17Bells LakeParry Sound DistrictA20 ft6 µg/L-
18Belmont LakePeterboroughA17.1 ft7.2 µg/L-
19Big Barnum LakeHaliburtonA19.7 ft5.3 µg/L-
20Big Brother LakeHaliburtonA15.3 ft5.7 µg/L-
21Big Clear LakeFrontenacA15.1 ft9 µg/L-
22Big Clear LakeFrontenacA21.3 ft8.1 µg/L-
23Big Hawk LakeHaliburtonA21.3 ft5.1 µg/L-
24Big Limestone LakeRenfrewA16.4 ft7.1 µg/L-
25Big Olhman LakeFrontenacA16.4 ft13.8 µg/L-
26Big Rideau LakeLeeds and Grenville CountiesA18.9 ft9.7 µg/L-
27Big Skunk LakeAlgoma DistrictA15.7 ft5.7 µg/L-
28Big Straggle LakeHaliburtonA16.4 ft7.9 µg/L-
29Big Vermilion LakeSudbury DistrictA19.7 ft6.7 µg/L-
30Bitter LakeHaliburtonA19 ft5.4 µg/L-
31Blackstone LakeParry Sound DistrictA15.1 ft8.9 µg/L-
32Blue LakeParry Sound DistrictA21.5 ft3.9 µg/L-
33Blue LakeHaliburtonA22.3 ft6.6 µg/L-
34Blue LakeFrontenacA37.7 ft8.1 µg/L-
35Blue LakeKenora DistrictA17.1 ft11.3 µg/L-
36Bob LakeHaliburtonA15.1 ft5.8 µg/L-
37Bobs LakeFrontenacA15.7 ft9.3 µg/L-
38Bonnie LakeMuskoka DistrictA19.7 ft5 µg/L-
39Boshkung LakeHaliburtonA18 ft5.4 µg/L-
40Bow LakeHaliburtonA26.2 ft4.6 µg/L-
41Brewster LakeRenfrewA16.4 ft11 µg/L-
42Broder LakeSudbury DistrictA16.4 ft5 µg/L-
43Brule LakeFrontenacA23.3 ft5.4 µg/L-
44Buck LakeMuskoka DistrictA20.7 ft8.3 µg/L-
45Buckshot LakeFrontenacA17.1 ft5.8 µg/L-
46Burdock LakeHaliburtonA23 ft7.8 µg/L-
47Burnt LakeParry Sound DistrictA19.7 ft6.1 µg/L-
48Burridge LakeFrontenacA17.2 ft9 µg/L-
49Buzzard LakePeterboroughA20 ft13.3 µg/L-
50Camp LakeMuskoka DistrictA23 ft5.8 µg/L-

More Answers for Ontario

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