This project will focus on the water and sanitation requirements of school children in 22 schools in villages in the municipality of Acatenango in Chimaltenango, Guatemala. The project will have four specific objectives: 1) Fabrication and installation of biosand water filtration units in the 22 schools, supplemented with take-home water bottles for after school-hours use; 2) Fabrication and installation of hand-washing stations in the schools; 3) installation of five community-scale units to serve 200 families each; and 4) implementation of an educational program modeled on the UNICEF Three-Star approach.