More than one billion people are without access to safe drinking water and 2.4 billion people lack basic sanitation. Each year, some 1.7 million people (4,740 every day) die because of deficient water and sanitation. If these current figures are shocking, the outlook is no better. By 2025, it is estimated that more than half of the people on our planet will be living with water scarcity. The 21 case studies contained in this volume offer examples of hands-on experience in addressing these issues and others in 18 countries of the South. Together, they offer vital lessons to people interested in their replication or adaptation.