Select Your State
Pick your state to search its lakes and open county-level water quality pages. As of September 3, 2026, LakeQuality tracks 37,603 lakes. Every page reports the measurements its agency published. Ontario and Québec are Canadian provinces, not US states.
Minnesota
6,760 lakes · 85 counties
Cleanest: Rainy Lake
Search Minnesota lakes →Michigan
3,392 lakes · 83 counties
Cleanest: Bostwick Lake
Search Michigan lakes →Wisconsin
3,133 lakes · 72 counties
Cleanest: Big Cedar Lake-North Site-Near West Bend
Search Wisconsin lakes →Florida
3,122 lakes · 64 counties
Cleanest: Jacc Lake
Search Florida lakes →Alaska
2,244 lakes · 33 counties
Search Alaska lakes →New York
1,613 lakes · 59 counties
Cleanest: Seneca Lake Platform
Search New York lakes →Maine
1,527 lakes · 16 counties
Cleanest: Big Lake
Search Maine lakes →Texas
1,376 lakes · 221 counties
Cleanest: Lake Meredith
Search Texas lakes →California
1,078 lakes · 57 counties
Cleanest: Folsom Lake
Search California lakes →Montana
865 lakes · 54 counties
Cleanest: Tally Lake
Search Montana lakes →Massachusetts
829 lakes · 15 counties
Cleanest: Long Pond
Search Massachusetts lakes →North Dakota
826 lakes · 51 counties
Cleanest: Lake Darling
Search North Dakota lakes →Washington
792 lakes · 35 counties
Cleanest: Fdr Lake
Search Washington lakes →Louisiana
785 lakes · 97 counties
Cleanest: New Canal Lighthouse Lake
Search Louisiana lakes →Colorado
733 lakes · 62 counties
Cleanest: Pueblo Reservoir
Search Colorado lakes →Wyoming
731 lakes · 21 counties
Cleanest: Seminoe Reservoir Riverine Pelagic
Search Wyoming lakes →Georgia
693 lakes · 143 counties
Cleanest: Lake Worth
Search Georgia lakes →Oregon
659 lakes · 35 counties
Cleanest: Crescent Lake
Search Oregon lakes →New Hampshire
650 lakes · 10 counties
Cleanest: Armington Lake-Deep Spot
Search New Hampshire lakes →Arkansas
632 lakes · 68 counties
Cleanest: Beaver Lake
Search Arkansas lakes →Illinois
594 lakes · 96 counties
Cleanest: Lake Opeka
Search Illinois lakes →Nebraska
592 lakes · 70 counties
Cleanest: Lake C W Mcconaughy
Search Nebraska lakes →Pennsylvania
570 lakes · 65 counties
Cleanest: Belmont Lake
Search Pennsylvania lakes →South Dakota
469 lakes · 59 counties
Cleanest: Canyon Lake
Search South Dakota lakes →Missouri
451 lakes · 93 counties
Cleanest: Sherwood Lake
Search Missouri lakes →Alabama
422 lakes · 67 counties
Cleanest: Smiw Lake
Search Alabama lakes →Mississippi
412 lakes · 78 counties
Cleanest: Pool D
Search Mississippi lakes →North Carolina
395 lakes · 83 counties
Cleanest: Sutton Lake
Search North Carolina lakes →Virginia
390 lakes · 99 counties
Cleanest: Mouth of Witcher Cr. Lake
Search Virginia lakes →Indiana
387 lakes · 64 counties
Cleanest: Lake George
Search Indiana lakes →Connecticut
379 lakes · 17 counties
Cleanest: Bashan Lake
Search Connecticut lakes →New Jersey
343 lakes · 20 counties
Cleanest: East Brunswick Community Park Lake
Search New Jersey lakes →Iowa
330 lakes · 91 counties
Cleanest: West Okoboji Lake
Search Iowa lakes →New Mexico
326 lakes · 30 counties
Cleanest: Abiquiu Reservoir Chama R Inlet
Search New Mexico lakes →Oklahoma
319 lakes · 71 counties
Cleanest: Lake Texoma
Search Oklahoma lakes →Vermont
308 lakes · 14 counties
Cleanest: Lake St. Catherine
Search Vermont lakes →Utah
304 lakes · 29 counties
Cleanest: Flaming Gorge Reservoir Antelope Flat
Search Utah lakes →Idaho
301 lakes · 41 counties
Cleanest: Black Cnyn Reservoir Ns of
Search Idaho lakes →Ohio
292 lakes · 81 counties
Cleanest: Marysville Upground Reservoir
Search Ohio lakes →Tennessee
277 lakes · 75 counties
Cleanest: Piney River Lake
Search Tennessee lakes →South Carolina
249 lakes · 42 counties
Cleanest: Lake Marion
Search South Carolina lakes →Kansas
239 lakes · 82 counties
Cleanest: Wilson Lake
Search Kansas lakes →Arizona
229 lakes · 14 counties
Cleanest: Chaparral Park Lake
Search Arizona lakes →Nevada
223 lakes · 16 counties
Cleanest: Comins Reservoir
Search Nevada lakes →Kentucky
189 lakes · 85 counties
Cleanest: Nolin Lake
Search Kentucky lakes →Rhode Island
134 lakes · 5 counties
Search Rhode Island lakes →Maryland
94 lakes · 22 counties
Search Maryland lakes →Delaware
51 lakes · 3 counties
Search Delaware lakes →West Virginia
38 lakes · 27 counties
Search West Virginia lakes →Canada
Alberta, Saskatchewan, Manitoba, New Brunswick, Prince Edward Island, Yukon, Northwest Territories and Nunavut are not listed. No licensed lake-chemistry record for those places is published here.
Lakes by country
Each country hub publishes the rating its own national or EU authority issued, attributed to that agency.