http://www.atsdr.cdc.gov/csem/csem.asp?csem=7&po=8 http://www.atsdr.cdc.gov/csem/csem.asp?csem=7&po=8 Lead Toxicity - What Are U.S. Standards for Lead Levels? action level for lead in drinking water is 0.15 mg/L according to the US CDC CDC government standards CDC is 10 μg/dL children play is 400 ppm children play is 400 ppm Lead Toxicity - What Are U.S. Standards for Lead Levels?