This document provides an overview of Peace Corps water and sanitation activities, five case studies (Thailand, Yemen, Paraguay, Sierra Leone, and Togo), programming guidelines, and training information. Each case study includes: (1) background information on the country's geography, population, and economics; (2) information on the country's water and sanitation status; (3) an overview of Peace Corps water and sanitation projects in the country, including the history of such projects; (4) information related to such areas as training, collaboration, community participation, and women in development; and (5) an analysis pointing out aspects which contributed to or hindered success of the projects. The training information provided includes lists of preservice and inservice skill-training objectives and sources of technical training and assistance resources and materials. A list of all Peace Corps water and sanitation activities since 1970 by region and country, the survey questionnaire used to gather data for the case studies, and information on project planning are among the items included in appendices. (JN)