For those using tap water from public water supplies, there is little danger as the water supply is constantly monitored and warnings are issued if there is a risk of contamination. (verywellfamily.com)
For drinking water, the upgrades would be designed to cleanup «regulated and unregulated contaminants,» including lead and connecting areas still on well water with public water systems. (buffalonews.com)
Other methods include teaching people to stay out of public water. (scientificamerican.com)