Paris is set to allow swimming in the Seine River in 2024 after nearly 100 years of ban due to pollution. The ban was originally imposed in 1923 because of excessive water contamination. For the 2024 Olympic Games, swimming events such as triathlon, marathon swimming, and para-triathlon will take place in the Seine, marking the first time in over a century that athletes will swim in the river

. Following the Olympics, starting in 2025, the public will be allowed to swim in three designated areas of the Seine—Bras Marie, Bras de Grenelle, and Bercy. These zones will have facilities like pontoons, changing rooms, and showers, making swimming accessible and safe for locals and tourists alike

. This reopening is part of a major €1.4 billion project to clean and regenerate the river, including building a large underground reservoir to manage sewage overflow during heavy rains, significantly improving water quality

. However, water quality remains closely monitored, and swimming may be temporarily suspended during adverse weather conditions

. In summary, after almost a century-long ban, Paris is allowing swimming in the Seine starting with the 2024 Olympics and opening public swimming areas in 2025, thanks to extensive river cleanup efforts