The global water crisis has greatly improved over the past 15 years, but it’s far from over.

The Millennium Development Goals (MDGs), the United Nations’ blueprint for tackling the world’s most pressing issues, expire this year, allowing us to look at how far we’ve come as well as what we can do better with the next set of global targets — the Sustainable Development Goals.

Goal 7 of the MDGs focused in part on water scarcity, with a target of halving the number of people around the world without sustainable access to safe drinking water and basic sanitation services. Today, 91% of the world’s population uses an improved drinking water source, compared to 76% in 1990, but water scarcity still affects more than 40% of people, across every continent.