The Vengeron beach has reopened after being closed since Tuesday due to pollution linked to a ruptured sewage pipe near Geneva Airport.
The Cantonal Medical Service says water quality has now returned to safe levels, with bacteria readings back within acceptable limits.
Authorities say regular testing continues, and are reminding swimmers to avoid bathing for 48 hours after heavy rain or storms.
The reopening comes just in time for the sunny Pentecost weekend.
Bacteria warning in lakes
Sunny skies and temperatures approaching 30 degrees are expected this weekend, making lakes and rivers popular destinations across. But authorities canton Vaud are warning swimmers about a very real risk: cyanobacteria, which can spread rapidly in warm, still water.
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Lausanne at forefront on antibiotic resistance research
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Luxury shoemaker ends Swiss production
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Speed camera vandal spared prison
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G7 border closures revealed
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