This resource was developed to support Peace Corps Volunteers who are working with schools to improve water, sanitation, and hygiene (WASH) facilities and programming. It is intended to provide guidance, resources, and ideas to support comprehensive WASH programming that is focused on behavior change and sustainability. There is no "one-size fits all" model project for WASH in schools. Instead, this toolkit promotes comprehensive needs assessments that can support Volunteers in a holistic discussion with their school community about all the dimensions of WASH. In the end, a school that provides appropriate WASH facilities, education, and programs can have a positive impact on both the health and learning of students.