Floods, droughts, and poor sanitation are three facets of the global water crisis, which can be summed up in terms of too much, too little, and too polluted. Today, 1.81 billion people face significant flood risk, 2.3 billion lack access to safely managed water, and 3.5 billion lack access to safely managed sanitation. These challenges are exacerbated by the intensifying effects of climate change, rapid population growth, and rising food insecurity.