Paris 2024 Games water status update

Water quality improves weeks before the games

The water quality of the River Seine has been the subject of a meticulous monitoring  in the framework of preparations for the triathlon of the Olympic Games in Paris 2024.

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The competition, which will take place on the emblematic Pont Alexandre III, has focused attention on safety and optimal conditions for athletes.

Since the beginning of June, the water quality of the Seine has been analyzed daily at four strategic points: Bercy (right bank), Bras Marie, Pont Alexandre-III and Bras de Grenelle.

These monitoring points provide precise data on the microbiological quality of the water, focusing on the presence of two specific bacteria: Escherichia coli e intestinal enterococci.

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Un recent report, published on July 4, 2024 by the City of Paris, reveals promising results.

During the period from June 24 to July 2, water quality has shown notable improvement, complying with the thresholds established by the European directive on most of the days monitored.

Updated report on water status in Paris 2024

E. Coli (concentration level in CFU / 100ml)

E. Coli Levels

Enterococcus (concentration level in CFU/100ml)

Enterococcus levels

This positive evolution is attributed to the better meteorological conditions, such as the return of the sun and the increase in temperatures, as well as the works carried out under the Seine Water Quality Improvement Plan.

However, not everything has been positive. On June 30, an intense storm in the Île de France basin caused a temporary degradation of water quality.

The heavy rains, which reached 24 mm over the weekend, affected both the Seine and the Marne, reducing the quality of the water at the monitoring points, although this He recovered quickly the next day.

The flow of the Seine has remained high, considerably higher than that usually observed in summer, oscillating between 407 m³/s and 605 m³/s. This high flux, although generally beneficial in diluting contaminants, has been altered by recent climate variability.

For the organizers of the Olympic Games, ensuring the safety of athletes is a priority. Local authorities and experts have worked tirelessly to ensure water conditions are suitable for competition.

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