While great steps have been taken during the past two decades to reduce the levels of lead in water, lead may still get into water from older metal faucets, taps, or pipes. To protect Illinois children from possible exposure to lead in drinking water, Governor Bruce Rauner and the General Assembly passed Public Act 99-0922 requiring schools and daycares to sample for lead

http://www.dph.illinois.gov/topics-services/environmental-health-protection/lead-in-water