Select Your State
Pick your state to search its lakes and open county-level water quality report cards. LakeQuality grades 14,418 lakes across 41 states and 3,238 counties.
Ontario
2,822 lakes · 40 counties
Cleanest: Crosby Lake
Search Ontario lakes →Minnesota
2,394 lakes · 77 counties
Cleanest: Rainy Lake
Search Minnesota lakes →Florida
2,159 lakes · 59 counties
Cleanest: Jacc Lake
Search Florida lakes →Wisconsin
1,428 lakes · 69 counties
Cleanest: Big Cedar Lake-North Site-Near West Bend
Search Wisconsin lakes →Québec
1,018 lakes · 70 counties
Cleanest: Lac Beauport
Search Québec lakes →Michigan
646 lakes · 62 counties
Cleanest: Chippewa Lake Northeast Basin; Chippewa Township
Search Michigan lakes →Missouri
278 lakes · 77 counties
Cleanest: Sherwood Lake
Search Missouri lakes →Vermont
228 lakes · 14 counties
Cleanest: Lake St. Catherine
Search Vermont lakes →Wyoming
220 lakes · 19 counties
Cleanest: Flaming Gorge Reservoir
Search Wyoming lakes →Iowa
209 lakes · 76 counties
Cleanest: West Okoboji Lake
Search Iowa lakes →Kansas
196 lakes · 75 counties
Cleanest: Wilson Lake
Search Kansas lakes →New York
189 lakes · 48 counties
Cleanest: Owasco Lake Platform
Search New York lakes →Montana
188 lakes · 13 counties
Cleanest: Tally Lake
Search Montana lakes →Virginia
175 lakes · 61 counties
Cleanest: Mouth of Witcher Cr. Lake
Search Virginia lakes →Utah
168 lakes · 28 counties
Cleanest: Flaming Gorge Reservoir Antelope Flat
Search Utah lakes →Texas
164 lakes · 90 counties
Cleanest: Lake Meredith
Search Texas lakes →Oklahoma
157 lakes · 60 counties
Cleanest: Lake Texoma
Search Oklahoma lakes →North Carolina
154 lakes · 58 counties
Cleanest: Sutton Lake
Search North Carolina lakes →North Dakota
149 lakes · 48 counties
Cleanest: Lake Darling
Search North Dakota lakes →Illinois
148 lakes · 45 counties
Cleanest: Lake Opeka
Search Illinois lakes →Arkansas
137 lakes · 52 counties
Cleanest: Beaver Lake
Search Arkansas lakes →Colorado
118 lakes · 49 counties
Cleanest: Pueblo Reservoir
Search Colorado lakes →Kentucky
113 lakes · 75 counties
Cleanest: Nolin Lake
Search Kentucky lakes →Alabama
110 lakes · 45 counties
Cleanest: Smiw Lake
Search Alabama lakes →Massachusetts
105 lakes · 12 counties
Cleanest: Long Pond
Search Massachusetts lakes →Oregon
99 lakes · 25 counties
Cleanest: Crescent Lake
Search Oregon lakes →Tennessee
76 lakes · 42 counties
Cleanest: Piney River Lake
Search Tennessee lakes →Arizona
75 lakes · 14 counties
Cleanest: Chaparral Park Lake
Search Arizona lakes →New Mexico
73 lakes · 22 counties
Cleanest: Abiquiu Reservoir
Search New Mexico lakes →Nebraska
69 lakes · 49 counties
Cleanest: Lake C W Mcconaughy
Search Nebraska lakes →Nevada
56 lakes · 12 counties
Cleanest: Comins Reservoir
Search Nevada lakes →Washington
56 lakes · 18 counties
Cleanest: Fdr Lake
Search Washington lakes →Georgia
56 lakes · 35 counties
Cleanest: Lake Worth
Search Georgia lakes →Ohio
52 lakes · 28 counties
Cleanest: Alum Creek Lake
Search Ohio lakes →Idaho
50 lakes · 17 counties
Cleanest: Black Cnyn Reservoir Ns of
Search Idaho lakes →Maryland
24 lakes · 10 counties
Search Maryland lakes →Indiana
22 lakes · 7 counties
Cleanest: Middle Lagoon Lake
Search Indiana lakes →Maine
18 lakes · 4 counties
Cleanest: Big Lake
Search Maine lakes →South Dakota
9 lakes · 5 counties
Cleanest: Big Stone Lake
Search South Dakota lakes →South Carolina
6 lakes · 5 counties
Cleanest: Lake Marion
Search South Carolina lakes →Pennsylvania
4 lakes · 4 counties
Search Pennsylvania lakes →