For the first time in over a century, Parisians and tourists can take a refreshing dip in the River Seine. The long-polluted waterway has finally opened up as a summertime swim spot following a 1.4 billion euro ($1.5 billion) cleanup project that made it suitable for Olympic competitions last year.
Three new swimming sites on the Paris riverbank opened on the weekend (July 5) – one close to Paris’ Notre Dame Cathedral, another near the Eiffel Tower and a third in eastern Paris.
Swimming in the Seine has been illegal since 1923, with a few exceptions, due to pollution and risks posed by river navigation. Taking a dip outside bathing areas is still banned for safety reasons.
The Seine was one of the stars of the Paris Olympics in 2024, whether as the scene of the ambitious opening ceremony or the triathlon and marathon swimming competitions. That didn’t go without challenging hurdles such as rainfall increasing levels of bacteria, which postponed some competitions.
This city’s authorities gave the green light for the public opening, with water quality results consistently in line with European regulations.
“It’s a symbolic moment when we get our river back,” said sports coach and influencer Lucile Woodward, who participated in the first amateur open water competition in the Seine after it opened.
Olympic athletes competing in the river was a spectacular reward for the cost of the cleanup effort. In the run-up to the Games, authorities opened new disinfection units and created a huge storage basin meant to prevent as much bacteria-laden wastewater as possible from spilling directly into the Seine when it rains.
Houseboats that previously emptied their sewage directly into the river were required to hook up to municipal sewer systems. Some homes upstream from Paris also saw their wastewater connected to treatment plants instead of the rainwater system flowing directly into the river.
Green flag for swimming
Paris Deputy Mayor Pierre Rabadan says water is tested daily to confirm it’s safe to swim. As on French beaches, different coloured flags will inform visitors whether or not they can go in.
“Green means the water quality is good. Red means that it’s not good or that there’s too much current,” he said.
Tests have been in line with European regulations since the beginning of June, with only two exceptions due to rain and boat-related pollution, Rabadan said.
“I can’t make a bet on the numbers of days when we’ll have to close this summer, but water quality seems better than last year,” he added. “We’re in a natural environment … so weather condition variations necessarily have an impact.”
Last year, several athletes became ill after competing in the triathlon and open water races during the Olympics, though in most cases it was not clear if the river was to blame for their sickness.
Skepticism remains
Dan Angelescu, founder and CEO of Fluidion, a Paris and Los Angeles-based water monitoring tech company, has routinely and independently tested bacterial levels in the Seine for several years. Despite being in line with current regulations, the official water testing methodology has limitations and undercounts the bacteria, he said.
“What we see is that the water quality in the Seine is highly variable,” Angelescu said. “There are only a few days in a swimming season where I would say water quality is acceptable for swimming.”
“All we can say is that we can raise a hand and say look: the science today does not support the current assessment of water safety used in the rivers around Paris, and we think that there is major risk that is not being captured at all,” he said.
Until the end of August, swimming sites will be open for free at scheduled times to anyone with a minimum age of 10 or 14 years, depending on the location. Lifeguards will keep a watchful eye on those first dips.
“It’s an opportunity, a dream come true,” said Clea Montanari, a project manager in Paris. “It’d be a dream if the Seine becomes drinkable, that would be the ultimate goal, right? But already swimming in it is really good.”
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