Supplying the world's urban dwellers with adequate water in 2050 will pose a challenge. More than 1 billion people will live in cities without sufficient available water within their urban extent, and these cities will need to invest in other ways to get water. It is a solvable problem but one that will take money, time, political will, and effective governance. For countries with moderate to high per-capita income, domestic investments seem likely to be adequate to find solutions to water shortage if sufficient political will can be found. However, for countries with low per-capita income, domestic investment is likely to be inadequate, and new financing institutions and commitments by the international community will be needed. These kinds of commitments are crucial if the world is to ensure that all urban residents can enjoy their fundamental human right to adequate drinking water.