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Updated August 2026

Trend Reports

Data-driven reports highlighting the biggest changes and notable findings.

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Cleanest Lakes

The cleanest lakes on nutrient and algae readings in Minnesota and Wisconsin

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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Supported by advertising. LakeQuality is free to read; ads never influence our rankings or the measurements we show — 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 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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