Overview

• Three supervised swim areas at Grenelle, Île Saint-Louis and Bercy opened on July 5 with marked zones, lifeguards and capacity limits.
• Entry is free but limited to swimmers aged 14 or older who are at least 1.4 meters tall and wear safety buoys, while parents may bring younger children in designated shallow sections.
• The Agence Régionale de Santé oversees daily water-quality checks using special sondes that measure bacteria levels in near real time and trigger closures if thresholds are exceeded.
• The bathing program is backed by a €1.4 billion upgrade to Paris’s wastewater and river-sanitation infrastructure delivered as part of the Paris 2024 Olympic legacy.
• Independent analyses by Fluidion warn that the Seine’s bacterial levels remain variable and that swimming outside monitored days or zones could pose health risks.