Living Waters for the World (LWW) is a nonprofit that trains volunteer mission teams to teach communities to install and maintain water purification systems  that make their contaminated water safe to drink.  Volunteers also teach health education programs  that emphasize the importance of hand-washing and essential uses of clean water.  Most LWW water purification systems are located outside of the United States in community settings such as civic centers, orphanages, and churches.  Volunteers  have also partnered with homeowners in rural Appalachia to install  home-based systems.