According to a 2012 report released by the World Health Organization (WHO) and the United Nations Children’s Fund (UNICEF), roughly 780 million people around the world lack access to clean drinking water and an estimated 2.5 billion people (roughly 40% of the world’s population) are without access to safe sanitation facilities. The United States has long supported efforts to improve global access to clean water, sanitation, and hygiene (WASH). In 2000, for example, the United States signed on the Millennium Development Goals, one of which includes a target to halve the proportion of people without access to safe drinking water and basic sanitation by 2015. This book focuses on the bilateral WASH programs authorized by the Water for the Poor Act. These programs are monitored and reported by the Department of State and implemented primarily by USAID and the Millennium Challenge Corporation (MCC).