This report has two broad objectives: (a) to summarize the understanding of climate change projections and scenarios, and the impacts climate change may have on water resources, and water supply, sanitation and hygiene (WASH) in Sub-Saharan Africa (SSA) and South Asia and (b) to discuss the implications of the above for policy and practice at a range of levels, from funding for climate change adaptation at an international level, to the planning and implementation of WASH interventions at a community level.