After a $1.5 billion cleanup, the Seine reopens for swimming

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Far away, overhead view from the Passerelle Simone de Beauvoir of the first people swimming in the Seine at the safe bathing site at Bercy.Tourism authorities believe the re-opening of the Seine to the public will attract tourists, especially given the scenic locations of the three public swimming areas.
BASTIEN OHIER—Hans Lucas/AFP/Getty Images

On Saturday, Parisians and tourists alike were able to swim in France’s Seine River for the first time in over a century. The river has been closed off to swimmers since 1923, when it was deemed too polluted to swim in safely. 

Though the city has talked about cleaning up the Seine since the 1990s, the real push came in 2015 when Paris made a bid to host the 2024 Olympics. In that nine-year span, enough progress was made that open-water swimming races were held in the waterway. Even Paris Mayor Anne Hidalgo took a dip last summer to prove the river was clean enough to host competitions.

A person treads water in a new designated swimming site.The three swimming sites are free at scheduled times and will allow about 1,000 swimmers per day during the swimming season, which lasts until late August.
Dmitry Kostyukov—The New York Times/Redux
People enter the water at a new designated swimming site.Each of the three swimming locations has a lifeguard on duty as well as changing rooms, showers, and beach-style furniture.
Dmitry Kostyukov—The New York Times/Redux
Overhead view from the Passerelle Simone de Beauvoir of the first people swimming in the Seine at the safe bathing site at Bercy.Additional swimming spots on the Seine located outside of Paris are due to open in the near future.
BASTIEN OHIER—Hans Lucas/AFP/Getty Images

To ensure the river was Olympic-ready, Paris invested $1.5 billion into the cleanup effort, known as the “Swimming Plan.” As a result, more than 20,000 homes that were previously dumping wastewater into the Seine have now been integrated into the sewer system, significantly reducing the amount of pollution seeping into the river.

However, the all-clear is not indefinite: city officials will continue to monitor bacteria levels daily to determine if the river is safe to swim in, and green and red flags will mark whether or not swimmers can take a dip. On Sunday, just one day after the river’s grand reopening, the flags were red after that day’s rainfall brought levels of bacteria to an unsafe point. Heavy rains can overwhelm the newly built cisterns, which can hold up to 13 million gallons of wastewater that would otherwise go directly into the Seine. 

On the days that bear a green flag, the three swimming locations will allow about 1,000 visitors a day until the end of August. 

People swim at the Pont Marie safe bathing site on the Seine.Advocates fighting to reclaim the Seine for swimming have said that public waterways will be an effective way for people to cool down during increasingly hot summers, according to The Guardian.
JULIEN DE ROSA—AFP/Getty Images
A man dives in the water as people swim at the Grenelle safe bathing site.As a part of the designated swimming locations’ strict safety measures, swimmers have to wear a yellow lifebuoy tied around their waist.
Thomas Padilla—AP Photo

This story was originally featured on Fortune.com

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