Lakes by State
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. Pick a US state to see its measured lakes, county listings, and lake pages. Not every state has enough sampled lakes to rank a cleanest list.
Minnesota
6,760 lakes across 85 counties
Michigan
3,392 lakes across 83 counties
Wisconsin
3,133 lakes across 72 counties
Florida
3,122 lakes across 64 counties
Alaska
2,244 lakes across 33 counties
New York
1,613 lakes across 59 counties
Maine
1,527 lakes across 16 counties
Texas
1,376 lakes across 221 counties
California
1,078 lakes across 57 counties
Montana
865 lakes across 54 counties
Massachusetts
829 lakes across 15 counties
North Dakota
826 lakes across 51 counties
Washington
792 lakes across 35 counties
Louisiana
785 lakes across 97 counties
Colorado
733 lakes across 62 counties
Wyoming
731 lakes across 21 counties
Georgia
693 lakes across 143 counties
Oregon
659 lakes across 35 counties
New Hampshire
650 lakes across 10 counties
Arkansas
632 lakes across 68 counties
Illinois
594 lakes across 96 counties
Nebraska
592 lakes across 70 counties
Pennsylvania
570 lakes across 65 counties
South Dakota
469 lakes across 59 counties
Missouri
451 lakes across 93 counties
Alabama
422 lakes across 67 counties
Mississippi
412 lakes across 78 counties
North Carolina
395 lakes across 83 counties
Virginia
390 lakes across 99 counties
Indiana
387 lakes across 64 counties
Connecticut
379 lakes across 17 counties
New Jersey
343 lakes across 20 counties
Iowa
330 lakes across 91 counties
New Mexico
326 lakes across 30 counties
Oklahoma
319 lakes across 71 counties
Vermont
308 lakes across 14 counties
Utah
304 lakes across 29 counties
Idaho
301 lakes across 41 counties
Ohio
292 lakes across 81 counties
Tennessee
277 lakes across 75 counties
South Carolina
249 lakes across 42 counties
Kansas
239 lakes across 82 counties
Arizona
229 lakes across 14 counties
Nevada
223 lakes across 16 counties
Kentucky
189 lakes across 85 counties
Rhode Island
134 lakes across 5 counties
Maryland
94 lakes across 22 counties
Delaware
51 lakes across 3 counties
West Virginia
38 lakes across 27 counties
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.
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