evidence: Preparing for the Future: Challenges in Water Management in Colombo, Sri Lanka [...] Water has become one of the key natural resources which are highly vulnerable to degradation in both quality and quantity under the circumstances of urban expansion and population explosion observed in major cities. Thus, adequate water management measures are considered as essential components in attaining sustainable development. The city of Colombo, the commercial capital of Sri Lanka, is increasingly experiencing a water crisis as a result of a rapidly growing demand that has outstripped existing resources. Two major sources of water are used to meet the needs of water supply to the city: rivers and reservoirs. Numerous factors could be held responsible for water shortages which appear from time to time, and the results are obvious: absence of or mostly, insufficient water in need. This paper highlights the issues in continuous water supply to Colombo with a special emphasis on current threat factors including pollution by domestic sewage, municipal wastewater and industrial effluents as well as salinity intrusion in Kelani River and other water sources. Potential effects of climate change could pose on water supply and are also discussed. [...] Wickramasinghe, D. (2019). Preparing for the Future: Challenges in Water Management in Colombo, Sri Lanka.