Every building in Dauphin County, by lead-paint risk.

This is the lead-risk map taken all the way down to individual homes, for all of Dauphin County. Each dot is one real property, colored by the decade it was built, because older homes are far more likely to contain lead paint. Scroll to zoom from the whole county down to a single street. A lead program matches this layer against the families it already serves and gets back a ranked list of which homes to check first.