Safe water and adequate sanitation are vital to individual health, livelihood and well-being. Exposure to diarrhoea-causing agents is frequently related to the use of contaminated water and to unhygienic practices in food preparation and disposal of excreta. Globally, diarrhoeal diseases are responsible for the deaths of 525 000 children under age 5 every year (WHO, www.who.int/en/news-room/fact-sheets/detail/diarrhoeal-disease). It was estimated that 88% of that burden is attributable to unsafe water supply, sanitation and hygiene and is mostly concentrated on children in developing countries (UNICEF and WHO, 2017b). Better access to water and sanitation contributes to better health but also leads to great social and economic benefits, whether through higher educational participation, improved living standards, lower health care costs or a more productive labour force. The United Nations set a target of achieving universal and equitable access to safe and affordable drinking water for all, as well as achieving access to adequate and equitable sanitation and hygiene for all and end open defecation by 2030. Furthermore, UNICEF’s strategy for WASH (UNICEF, 2017) seeks to ensure that every child lives in a clean and safe environment, gains access to basic sanitation and safe drinking water in early childhood development centres, school, health centres and in humanitarian situations.