This session presents an overview of the association between water, sanitation, hygiene and human health. A particular focus upon transmission and treatment of diarrhea disease among small children. Other diseases given particular priority in the presentation include Hepatitis A and E viruses and bacteria that cause cholera or typhoid fever. Likewise, the importance of water-washed diseases, especially infectious skin and eye diseases, such as scabies and trachoma are presented. The preventive actions needed to reduce the burden of the various infectious diseases associated with water, sanitation and hygiene will be introduced.