Hauts-de-France: Fluopyram in Our Tap Water

Contaminated tap water: what recent news reveals

Recently, several French municipalities in Hauts-de-France have been affected by drinking water contamination linked to pesticide residues, particularly fluopyram and some of its metabolites. These substances, originating from agricultural practices, have been detected in tap water at concentrations exceeding health thresholds.

Although health authorities emphasize that the water remains “safe to drink” under regulatory definitions, these revelations highlight a reality less familiar to the general public: safe to drink does not mean free of pollutants.

What is fluopyram, and why is it found in water?

Fluopyram is a fungicide used in agriculture to control certain crop diseases. The problem lies not only in the molecule itself, but also in its breakdown products, known as metabolites, which are extremely persistent in the environment.

These metabolites, sometimes classified as PFAS-type persistent pollutants, enter groundwater and then tap water. They are highly resistant to conventional drinking water treatments.

The result: even when water meets standards, traces of pesticides may remain.

The limitations of drinking water treatment

Water treatment plants are responsible for making water safe to drink according to strict health standards. However, these treatments were historically designed to remove:

• bacteria and viruses;
• suspended solids;
• certain conventional contaminants.

However, modern micropollutants (newer pesticides, PFAS, pharmaceutical residues) are much more difficult to remove. Current treatment processes cannot always filter them out completely.

Tap water: a real danger or an underestimated risk?

It is important to keep a balanced perspective. Drinking tap water does not pose an immediate danger to most people. However, chronic exposure to low doses of pollutants raises questions, particularly for:

• infants;
• pregnant women;
• people with weakened immune systems;
• people with chronic conditions.

More and more studies highlight the precautionary principle in response to cocktail effects, meaning the long-term accumulation of multiple substances at low doses.

Reverse osmosis: an effective solution against pollutants

Among the available solutions for improving tap water quality, reverse osmosis is currently considered one of the most effective.

A home reverse osmosis system uses a semipermeable membrane capable of retaining:

• up to 95–99 % of pesticides;
• PFAS and persistent metabolites;
• nitrates;
• heavy metals;
• medication residues.

The resulting water, known as RO water, has a low mineral content, is pure, and is particularly suitable for daily consumption.

Discover Josmose RO systems →

How to understand your everyday water quality

Before taking action, it is recommended that you understand your water quality precisely.

This can involve:

• reviewing local water analyses;
• testing your water at home;
• having a laboratory analysis performed.

FAQ – Tap water, pollutants, and filtration