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.
June one of the hottest on records
Switzerland has just lived through its third-hottest June since records began in 1864.
Storms hit central areas
Severe storms swept across central parts of the country last night, forcing Linkin Park to pause their Letzigrund stadium concert in Zurich for about 50 minutes.
Heat related hospital visits surge
Emergency calls to Geneva's 144 medical hotline rose about 60% over four days as last week's heatwave pushed temperatures to 37.
Storms destroy Geneva crops
The damage caused by the storm on Monday evening in Geneva is becoming clear.
Physical punishment for kids banned from today
Physical punishment of children is banned from today.
Gap grows between the wealthy and middle class
The gap between Switzerland's wealthy and its middle class widened again last year, according to UBS's annual global wealth report.
