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Water-quality measurements for lakes across 49 US states, as published by the EPA and state agencies. Ontario and Québec carry provincial measurements. Country hubs publish official ratings, attributed to the agency that issued them. Clarity, phosphorus, nitrogen, algae, and turbidity, plus depth and fish, shown as reported.

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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 what a lake’s page shows or where it ranks.

US lake pages show samples from the EPA Water Quality Portal and state agencies beside the EPA National Lakes Assessment condition class for each lake’s ecoregion. Canadian measurements come from provincial open-data programmes, not the EPA. EU bathing waters use the EEA Bathing Water Directive. International named-lake chemistry is attributed on each country page. See data sources and methodology. Not affiliated with any government agency.

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