Updated Oct. 26, 2026: rewritten as a practical guide for American travelers who want to swim in the Seine on a future trip to Paris, with the 2026 season details and safety rules.
Quick answer: Yes, you can swim in the Seine, but only at three official sites during the summer season: Bercy (12th arrondissement), Grenelle (15th, near the Eiffel Tower) and the Louis-Philippe site near Île Saint-Louis (4th). They are free, supervised by lifeguards and open to swimmers over 14. The 2026 season opened in early July and ran through late summer. Sites close when rain lowers water quality, so check the day’s flag before you go. Swimming anywhere else in the Seine is still banned.
Paris reopened river swimming in 2025 for the first time in about a century. Here’s how it works and how to plan a swim on your next trip.
The Seine swimming sites at a glance
| Site | Where | Good to know |
|---|---|---|
| Louis-Philippe (formerly Bras Marie) | 4th arrondissement, near Île Saint-Louis and Notre-Dame | Moved about 600 meters downriver in 2026; long opening hours |
| Grenelle | 15th arrondissement, with views toward the Eiffel Tower | Shorter hours; closed Aug. 1–9, 2026, for European swimming events |
| Bercy | 12th arrondissement, east Paris | Open into the evening in 2026 |
All three are free. The river is about 9 meters (30 feet) deep at the sites, so you can’t touch bottom. Only confident swimmers should go in.
How Paris cleaned up the river
Swimming in the Seine was banned in 1923 because of pollution. For decades, sewage overflowed into the river whenever it rained hard.
Ahead of the 2024 Paris Olympics, French authorities spent about 1.4 billion euros on cleanup. The biggest project was a giant underground basin near Austerlitz station that stores storm water so it doesn’t flood into the river. Thousands of homes and boats were also connected to proper sewers.
Olympic triathlon and marathon swimming events were held in the Seine in 2024, though some training sessions were canceled over water quality. Public swimming followed in July 2025, with the three city sites drawing big crowds.
Safety rules you need to know
- Check the flag. A green flag means swimming is open. A red flag means the site is closed, usually after rain.
- Swim only at official sites. Boats, currents and cold water make the rest of the river dangerous.
- Age limit: swimmers must be over 14.
- Bring ID and follow lifeguards. Sites have capacity limits, and staff may ask you to wait.
- Know your limits. There’s no shallow end. You’ll need to tread water or hold onto the edges.
- Skip it if you’re unwell or have open cuts. River water is never as clean as a pool.
How to plan a Seine swim: 5 steps
- Visit in summer. The season runs from early July through late summer. Check the City of Paris website for exact dates in the year you travel.
- Pick a site near your plans. Louis-Philippe is closest to Notre-Dame and the Marais. Grenelle suits an Eiffel Tower day.
- Check that morning. Water quality is tested daily. If it rained the night before, the site may be closed.
- Pack light. Bring a swimsuit, towel, sandals and a lock or small bag. Changing areas are basic.
- Go early or late. Midday on hot weekends brings the longest lines.
Also read: Best U.S. Beaches for 2026
If the site is closed: a backup plan
Rain is the main reason Seine sites close, sometimes for a day or two after a storm. Build flexibility into your trip:
- Plan your swim for early in your stay so you have backup days.
- Try the canal at Bassin de la Villette, which runs its own summer swimming area.
- Use a public pool. Paris has dozens, many with low entry fees.
- Enjoy the river from the bank. Paris Plages sets up deck chairs and activities along the water.
What U.S. travelers need for a Paris trip
| Item | What to know |
|---|---|
| Passport | Valid for at least 3 months after you leave the Schengen area; issued within the last 10 years |
| Entry/Exit System (EES) | Europe’s new biometric border check: your fingerprints and photo are taken on your first entry |
| ETIAS | A new online travel authorization for Americans, expected to start in the last quarter of 2026; fee 20 euros, valid up to 3 years |
| Length of stay | Up to 90 days in any 180-day period without a visa |
| Money | Cards work almost everywhere; carry a few euros for small purchases |
Check the State Department’s France page and the official ETIAS site before you book, since the start date has slipped before.
Made-up example (for illustration only): These are made-up travelers to show how a swim fits into a trip.
Maria and her 16-year-old son from Texas plan a July day around Notre-Dame. They check the city’s swim page at breakfast, see a green flag, and head to the Louis-Philippe site at 9 a.m. before the crowds. After a 40-minute swim, they dry off and walk to lunch in the Marais. The swim costs nothing, and it’s the part of the trip her son talks about most.
Timeline: how the Seine became swimmable
| When | What happened |
|---|---|
| 1923 | Paris bans swimming in the Seine because of pollution and boat traffic |
| 2010s–2024 | About 1.4 billion euros goes into sewer upgrades and a giant storm water basin |
| July 2024 | Mayor Anne Hidalgo swims in the Seine to show it’s clean; Olympic triathlon and marathon swimming follow |
| July 5, 2025 | Three public swimming sites open, the first legal public swimming in more than a century |
| Aug. 2025 | Season extended at two sites after nearly 100,000 swims |
| July 2026 | Second season opens; the central site moves near Pont Louis-Philippe |
What it’s actually like
Each site is a fenced section of riverbank with wooden decks, ladders into the water and lifeguards watching from above. You’ll find basic changing areas and showers, plus lockers at some sites. The water is greenish and cooler than a pool, often in the low 70s Fahrenheit in midsummer.
Because you can’t touch bottom, many swimmers stay near the edges or hold onto floating lines. Lines to get in can form on hot afternoons, and staff limit how many people are in the water at once.
Other European cities where you can swim in the river
- Copenhagen: Free harbor baths, like Islands Brygge, have been open for years.
- Zurich: Historic river baths on the Limmat are a summer tradition.
- Basel: Locals float down the Rhine with waterproof bags holding their clothes.
Paris joins that list, but with stricter rules, because the Seine is busier and deeper.
Other free places to swim in Paris
- Bassin de la Villette in northeast Paris has had summer swimming areas in the canal since 2017.
- Paris Plages turns riverbanks and canal sides into summer beach zones with deck chairs and activities.
- Public pools across the city are cheap, and some have outdoor or rooftop sections.
Common questions about water quality
Water in the Seine is tested for bacteria such as E. coli and enterococci, the same kind of tests used at U.S. beaches. Levels can jump after heavy rain, which is why sites close on short notice.
On good days, the water meets European bathing standards. If you’ve ever swum at a lake or river beach in the U.S., the experience is similar: generally safe at the right time, but not as controlled as a chlorinated pool.
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FAQ
Can you swim in the Seine in Paris?
Yes, at three official, supervised sites during the summer season: Bercy, Grenelle and Louis-Philippe near Île Saint-Louis. Swimming elsewhere in the river is banned.
Is it free to swim in the Seine?
Yes. The city’s Seine swimming sites are free to use.
Is the Seine clean enough to swim in?
On most days during the season, yes. Water is tested daily, and sites close after heavy rain when bacteria levels can rise.
How old do you have to be to swim in the Seine?
Swimmers must be over 14. The water is about 9 meters deep, so you need to be a confident swimmer.
When can you swim in the Seine?
The season runs in summer, opening in early July. Check the City of Paris website for the dates and hours in the year you travel.
Bottom line
A swim in the Seine is one of the newest free things to do in Paris, a century in the making. Go in summer, stick to the three official sites, check the flag that morning, and you’ll have a story few visitors can tell.
Last reviewed: Oct. 26, 2026. Season dates and hours change each year.
Sources: The Local France; Sortir à Paris; Paris je t’aime (official tourism office); U.S. State Department: France; EU: ETIAS.
Featured image: The Seine at Pont Royal, with the Musée d’Orsay behind. Photo: Dietmar Rabich / Wikimedia Commons, CC BY-SA 4.0; edited by Nexgen Headlines.
