Researchers build nationwide screening tool for childhood lead exposure risk by neighborhood
Using housing age and poverty as predictors, researchers calculated a lead exposure risk score for every U.S. census tract and county. The resulting map shows the highest risk in older-housing areas of the Northeast, Midwest, Great Plains, and Appalachia, with lower risk in newer Sun Belt and Western neighborhoods. The team compared the scores with children's blood lead levels in 11 states to validate the screening tool.
The researchers drew on EPA findings that a neighborhood's housing age and poverty rate help predict childhood lead exposure. They updated an existing public-health approach with 2018–2022 American Community Survey data and produced scores for every U.S. census tract and county. The tool is meant for screening, not household-level safety judgments.
Validation compared predicted risk with measured children's blood lead levels in 11 states, mostly in older-housing regions. Correlations were positive across those states, ranging from 0.43 to 0.77. Because the validation states lie in the Northeast, Midwest, and Great Plains, the map's lower-risk estimates for the West and Sun Belt remain untested.
A nationwide risk map could help public health agencies, clinicians, and community groups prioritize blood testing, home inspections, and outreach in neighborhoods where older housing and poverty may elevate lead exposure risk. Families in such areas might gain earlier awareness, though the tool cannot determine whether an individual home is safe. Its usefulness may be greatest where local lead data are sparse, but validation gaps in newer-housing regions could limit confidence there.