Global Lake Map
14,000+ graded lakes across the US and Canada, plus 6,211 European bathing waters, on one map. Search by name, filter by grade or EU class, or find what is near you.
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How to read this map
US and Canadian pins are LakeQuality A–F grades from EPA Water Quality Portal samples (clarity, phosphorus, chlorophyll-a). Gray pins are published but unrated — not enough recent evidence to assign a letter. European pins are official Bathing Water Directive classifications for designated bathing waters; they measure bacteria, not trophic state, and are never converted into an A–F grade. Click a pin or a row to highlight it; Open goes to the lake page.
Prefer the simpler US & Canada view? Use the interactive lake map.
Frequently Asked Questions
Every published LakeQuality page: 14,000+ US and Canadian lakes with A–F water-quality grades, plus 6,211 designated bathing waters in 27 European countries. European sites use the EU Bathing Water Directive classes (Excellent, Good, Sufficient, Poor), which are not the same scale as the A–F trophic grade.
Use the search box to match a lake name or a two-letter state / country code. Grade chips filter US and Canadian lakes; EU class chips filter European bathing waters. Near me sorts the list by distance and flies to the closest site. The list can follow the current map view.