Safe drinking water is essential to good health, but more than 880 million people worldwide lack access to it, according to UNICEF. Additionally, approximately 2.5 billion people around the world do not have access to basic sanitation. These issues pose a major threat to health. Water in resource-poor settings often carries deadly pathogens, and of the 1.5 million deaths from diarrheal disease each year, many are due to an unsafe water supply or lack of sanitation.1
1Black Re, Morris S, Bryce J. Where and why are 10 million children dying every year? Lancet. 2003;361(9376):2226-2234.