Lead poisoning in children refers to lead intoxication, defined in France as a blood lead level greater than or equal to 50 µg/L. The latest national report published by Santé publique France records 417 new cases among 4,182 tests performed on children aged 0 to 17 in 2020. The primary source of exposure remains dust from old paint in homes built before 1949.
Lead poisoning in children: what the screening figures show
Monitoring relies on the national surveillance system for blood lead levels in children. Every test performed on a minor is recorded there, making it possible to measure both screening activity and the number of cases.
Data published by Santé publique France for 2020 report 4,182 blood lead tests prescribed for children aged 0 to 17. On this basis, 417 new cases of lead poisoning were identified, including 376 during an initial screening.
This number of tests marks a sharp drop. There were 8,293 blood lead tests in 2019 and 7,182 in 2018. The halving observed in 2020 is attributed to disruptions in healthcare activity during the Covid-19 epidemic.
These figures call for cautious interpretation. They reflect the screening carried out, not the actual prevalence in the population. A decrease in the number of cases may indicate reduced exposure, but also a decrease in the number of children tested.
Average exposure, another way to measure it
Alongside targeted screening, Santé publique France conducts biomonitoring studies on representative samples. The Esteban study, carried out between 2014 and 2016, measured an average blood lead level of 9.9 µg/L among children aged 6 to 17.
Among adults aged 18 to 74, the same study found an average of 18.5 µg/L, compared with 27.5 µg/L in the previous 2006–2007 survey. The overall trend is therefore downward, driven by the phaseout of leaded gasoline and the renovation of the housing stock.
This decline does not mean the issue is resolved. Lead is considered a “no-threshold” toxicant: no concentration is considered harmless to a developing brain.
What thresholds should you know?
Two values guide lead poisoning management in France, both defined by the High Council for Public Health in 2015.
- 25 µg/L, the vigilance threshold: above this level, blood lead monitoring and preventive measures should be initiated.
- 50 µg/L, mandatory reporting threshold: since June 17, 2015, any measurement reaching or exceeding this value in a minor constitutes a case of lead poisoning that must be reported to the regional health agency.
The reporting threshold was previously set at 100 µg/L. Its reduction to 50 µg/L reflects evolving knowledge about the effects of low-dose lead exposure. Santé publique France explicitly states that levels below 50 µg/L can already cause damage to the central nervous system.
Where does the lead to which a young child is exposed come from?
The main source has long been identified. It is dust and flakes of lead-based paint, known as white-lead paint, found in homes built before 1975 and especially before 1949.
These paints deteriorate over time. Friction from a window, moisture, or poorly protected work releases fine dust that settles on the floor, at a child's height. This is where the risk is concentrated.
Other routes exist, less common but real:
- tap water in buildings still equipped with lead pipes;
- polluted soil near former industrial sites;
- certain handmade tableware, traditional ceramics, and imported cosmetics;
- a relative's professional or leisure activity: stained glass, foundry work, pottery, sport shooting.
The question of water is particularly important when preparing bottles. We addressed it in our article about which water to use for baby bottles, which summarizes the applicable official guidance.
Why toddlers are most exposed
Three factors combine before the age of three. The child spends a great deal of time on the floor, where dust settles. They systematically put their hands and objects in their mouth. Finally, their body absorbs a much larger proportion of ingested lead than an adult's.
This instinct to explore with the mouth is not a flaw: it is a normal stage of development, which we describe in our article about why babies put everything in their mouths. It becomes a risk factor only in a contaminated environment.
The reported effects concern cognitive development: reduced learning abilities and attention disorders. Santé publique France emphasizes that they are irreversible. In pregnant women, exposure is associated with an increased risk of premature birth and gestational hypertension.
Should your child be screened?
Screening is not systematic in France. It is targeted and requires a prescription when a risk factor has been identified. The doctor caring for the child decides whether it is indicated.
The situations that warrant discussing it are quite specific. Living or regularly staying in a deteriorated home built before 1949 is the leading factor. Other factors include recent work in such a home, living near an industrial site, a brother or sister who has already been screened, or an exposure-related occupation held by a parent.
The test is a simple blood sample. It is covered by health insurance, and the result directly guides the appropriate response. If the level is exceeded, the regional health agency launches an environmental investigation at home.
Prevention measures that have a real impact
Prevention starts with dust and hands. They are the two links in the exposure chain.
- Clean with a damp method rather than sweeping or vacuuming dry, which puts dust back into the air.
- Wash your hands before every meal and after every period of playing on the floor.
- Never sand or scrape old paint when a child is present, and entrust this work to a professional who is aware of the risk.
- Let the water run for a few moments before using it for food preparation or drinking, and use only cold water if the plumbing is old.
- Cover damaged areas while waiting for repairs, rather than allowing the paint to flake.
- Air out your home daily, which also applies to indoor pollutants as a whole.
This final point ties into a broader topic, which we documented in our article on indoor air pollution and babies’ health. The same precautions help protect against several types of contaminants.
The floor, a constant point of contact
Since exposure occurs through dust deposited on the floor, the surface on which the child plays deserves attention. A washable covering placed over an old hardwood floor and cleaned regularly with water limits direct contact.
The criteria for choosing a play surface—material, absence of substances of concern, and maintenance—are detailed in our guide to foam mat materials and safety.
Lead in products intended for children is governed by a different regulatory framework. Levels are regulated by the REACH regulation and the toy standard, as we explain in our article on baby product certifications. Our guide to the chemical safety of baby products provides further information.
Key takeaways
Childhood lead poisoning has declined sharply in France, but it has not disappeared. It remains concentrated in run-down older housing and mainly affects children under six.
Three points of reference are enough to assess the situation: the building date of the home, the condition of the paint, and the child’s age. If all three apply, it is worth discussing screening with a doctor.
Finally, the most recent national data date back to 2020 and were published online in 2022. This delay is usual for this type of surveillance, and it makes it worth following regional publications, which are often more up to date.
Sources
- Santé publique France, “Childhood lead poisoning” dossier, Data section, updated November 4, 2022 (2020 data from the national childhood blood-lead surveillance system).
- Santé publique France, “Childhood lead poisoning” dossier, The disease section (sources of exposure, health effects, 50 µg/L threshold).
- French High Council for Public Health, 2015 opinion setting the vigilance threshold at 25 µg/L; mandatory reporting from 50 µg/L since June 17, 2015.
- Santé publique France, Esteban study 2014–2016, component on lead exposure among the French population.
