An estimated seven million people currently live in the slums of Mumbai, India. Residents of these underserved communities suffer from a high incidence of enteric dysentery largely in part to contaminated drinking water, poor hygiene habits, and a lack of adequate sanitation. In response, the HMS team has been working since the summer of 2004 to help improve livelihoods trough health education and appropriate, low-cost water treatment methods. HMS is an interdisciplinary, international collaboration between local organizations and institutions in Mumbai and students at the University of California, Berkeley.