From the Document: "Communities may face a range of issues associated with aging water infrastructure, including elevated lead levels in tap water. Because of lead's toxicity, even at low levels, reducing lead exposures from drinking water and other sources remains a public health priority. Other sources of lead exposure include lead-based paint and contaminated soil and dust from deteriorated lead-based paint. Nationally, the phaseouts of leaded gasoline and lead-based paint, along with regulatory controls and technical changes, have reduced lead exposures. Since the late 1970s, overall blood lead levels in children (ages one to five) have declined an estimated 94%."
CRS In Focus, IF11302
Congressional Research Service: https://crsreports.congress.gov/