Diwakar and I made this video about dirty drinking water. In the United States, dirty drinking water is not much of a problem, but in certain impoverished countries (such as Nigeria and other countries in Africa) and in developing countries (such as China and India), it is a major problem. We should take all the necessary precautions to fix this growing problem.
These are the sources we used:
http://www.buffalocreek.org/preserve.html
http://www.chemistryexplained.com/Va-Z/Water-Pollution.html
http://www.ewashtenaw.org/government/departments/environmental_health/indoor_air/eh_leadinfo.html