Can heavy metals in old house dust raise children's blood lead levels?

What's actually in it

Homes built before 1978 often have layers of lead-based paint on walls, window frames, and trim. As this paint ages, it chips and crumbles into fine dust that settles on floors, windowsills, and toys. Lead is a heavy metal with no safe level of exposure in children. Even tiny amounts can harm a developing brain.

Older homes may also have lead in plumbing solder and some imported ceramic tiles, adding more sources of dust contamination.

What the research says

A 2026 study in Environ Res modeled how housing age and household characteristics predict childhood lead exposure. The findings confirm what public health experts have warned for years: the age of your home is one of the strongest predictors of a child's blood lead level.

Children in homes built before 1950 had the highest modeled blood lead levels, followed by those in homes built between 1950 and 1978. The main exposure route was hand-to-mouth transfer of contaminated floor dust. Toddlers crawling and playing on the floor ingest far more dust than adults realize.

The study also found that sociodemographic factors like household income and rental status correlated with exposure, since lower-income families more often live in older housing that hasn't been remediated.

If your home was built before 1978, have it tested for lead paint. Keep floors damp-mopped (dry sweeping spreads lead dust), wash children's hands before meals, and use a HEPA vacuum regularly. Professional lead abatement is the most effective long-term fix.