http://www.epa.gov/safewater/kids/index.html

http://en.wikipedia.org/wiki/Drinking_water

http://www.epa.gov/safewater/dwh/index.html

http://www.epa.gov/safewater/dwh/treat.html

http://www.epa.gov/safewater/dwh/where.html

http://www.epa.gov/safewater/dwh/getin.html

http://www.epa.gov/safewater/dwh/who.html