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Water quality report cards for every monitored lake across 41 states — clarity, phosphorus, algae, depth, and fish, graded A–F from EPA and state agency data.

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Supported by advertising. LakeQuality is free to read; ads never influence our grades or rankings — see our editorial policy.

Lodging results and prices come from Stay22, which sources live availability from Booking.com, Vrbo, and Expedia. Booking through those links may earn us a commission at no extra cost to you, and never changes a lake’s grade or where it ranks.

Data sourced from the EPA Water Quality Portal (aggregating state agencies across all 41 covered states), the MN DNR LakeFinder, and Wisconsin DNR. Grading based on Metropolitan Council standards. Not affiliated with any government agency.

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