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鈥楧on鈥檛 drink the water!鈥 Advice from our Paris correspondent as she dips into the Seine.

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Colette Davidson
Bathers enjoy the Seine near the 脦le Saint-Louis in Paris, one of three sites open to the public, Aug. 4, 2025. Mayor Anne Hidalgo had promised to open the Seine to public bathing after last year's Summer Olympics.

As any Minnesota native will tell you, open-water swimming is practically a rite of passage. Growing up in the "Land of 10,000 Lakes" means wading in any number of creeks, rivers, and ponds, be they pristine and glass-like or slimy and algae-filled. Why? Because we can.

I suspect this influences my thinking when I decide to jump into the Seine River in Paris, a body of water from which the authorities have dredged up countless questionable items in the decade I have lived here: piranhas, a 10-foot python, toxic waste, and 鈥 egad聽鈥 human cadavers.

But the Seine of today is nothing like the Seine of 10 years ago, much less 100 years ago, when the swimming ban here went into effect. The city of Paris spent 鈧1.4 billion ($1.63 billion) cleaning up its iconic waterway in time for the Olympic Games last summer, and Paris Mayor Anne Hidalgo has kept her promise to open the river to public bathing this year.

Why We Wrote This

Swimming in the Seine has long been a dubious proposition, not to say illegal. But the river now meets tough standards, allowing three in-river pools to open. Our intrepid correspondent dips her toes in the water.

And so, with this 鈥渂ecause we can鈥 attitude in mind, I tell myself to get over the ick factor and line up to swim.

Turns out, I鈥檓 not the only one. Since July 5, according to city officials, more than 35,000 people have swum in the three bathing sites now open to the public. It鈥檚 free to enter and, on warm afternoons, the pools quickly reach capacity. Would-be bathers are obliged to stand in line until others get out.

It soon becomes apparent, though, as I stand on the gently swaying dock at Port de Grenelle, the Eiffel Tower stretching out in front of me, that almost all my fellow swimmers are foreigners.

Lifeguards assure me that locals tend to come early, so as to enjoy a dip on their way to work. But for many, it鈥檚 a hard non.

鈥淲e got a lot of comments鈥 from Parisian friends, says Mickael Minghetti, a Belgian tourist, lounging in a chaise longue alongside German Lukas Werner. 鈥淭hey said 鈥榥o way, we鈥檇 never put our feet in the Seine.鈥欌

Why such bad press for a river that has inspired the likes of Jean-Paul Sartre, photographer Robert Doisneau and the poet Guillaume Apollinaire?

Courtesy of Colette Davidson
Monitor correspondent Colette Davidson tests the Seine's water at Port de Grenelle, just below the Eiffel Tower in Paris, Aug. 4, 2025.

Sure, a few triathletes blamed their digestive woes on the Seine swimming events during the Olympic Games. But since the river opened to bathers this summer, city officials have been testing the water multiple times each week. If bacteria levels rise above a certain threshold, they close the pools.

Still, the Seine has had trouble shedding its reputation as a place of filth. Prior to its cleanup, the river was an important link in the city鈥檚 transport and trade network, as well as a conduit for its sewage system. More than 20,000 homes dumped their waste directly into the Seine, and during heavy rainfall, gutters flowed into the river.

鈥淲e hear about rats in the Seine, or cigarette butts washing into the river after a heavy rainfall,鈥 says Corinne Piguet, a Swiss transplant who has lived in the Paris suburbs for two decades, and who has come to swim with a friend. 鈥淢ost Parisians don鈥檛 even want to consider swimming in it.鈥

But the newly constructed Austerlitz basin 鈥 an underground reservoir that can hold the equivalent of 12 Olympic-size swimming pools of water 鈥 will prevent untreated wastewater from being discharged into the Seine after it rains. Nearby houseboats and residential buildings are now connected to the city鈥檚 wastewater networks to prevent their sewage from flowing into the river.

That鈥檚 enough to persuade some people.

鈥淥f course I鈥檝e swum in it, many, many times,鈥 says J茅r茅mie Mercuri, the lifeguard manager for all three Seine bathing sites. 鈥淚 even drank the water once to prove that nothing bad would happen.鈥

So with these words in mind 鈥 and a mandatory yellow flotation device strapped around my waist 鈥 I step into the water. It is surprisingly cold and clear. The only critters I see are small gray fish, who dance around my feet. It feels like home.

And for a few moments, I lose myself. I slip into the water up to my neck and take in the scene 鈥 dozens of smiling swimmers, taking selfies, pointing at the Eiffel Tower and simply enjoying the refreshing water on this hot August day. A soft current pushes me from side to side, as I casually attempt a few laps.

But then, a boy splashes next to me. I am shaken out of my reverie by the memory of a voice 鈥 my own 鈥 yelling from the banks of the Mississippi on a recent trip to Minneapolis, as my daughters kicked river water all over each other: 鈥淐lose your mouth! Don鈥檛 drink the water!鈥

With that, I start thinking of Ms. Piguet鈥檚 comment about rats in the Seine and realize I can鈥檛 see to the bottom 鈥 it鈥檚 around 10 feet deep. I am overtaken by a familiar feeling, one I learned to respect growing up swimming in the opaque Minnesota lakes: When in doubt, just get out.

I grab my towel and head to the outdoor showers to rinse off, as Mr. Mercuri has instructed me to do. I feel refreshed and only slightly creeped out. After living in a place for so long, it鈥檚 fun to do something new and unique.

But as I head to the Metro, old habits die hard. I reach into my bag and spritz my hands with sanitizer. I鈥檓 sure that water was fine 鈥 wasn鈥檛 it?

When I get home, I take a long, hot shower.

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