The World Health Organization (WHO) recently released an interesting and easy to understand guide on the relationship between investments in water/sanitation/hygiene (WASH) and public health. The international community, and Haiti Innovation included, have been paying a lot of attention to food security. However, children with diarrhoea from poor water are not able to absorb nutrients, are more likely to become malnourished, and subsequently come down with a life threatening disease. Worldwide 1.4 million children a year die (6,000 a day) die from diarrhoea. In Haiti, 10% of all deaths are estimated to be water-related. Access to water, sanitation and hygiene, together are key to promoting public health in Haiti and elsewhere.