It bills itself as a "world-class African city" but these days residents say it's anything but — with the collapse of the water system and frequent power outages.
Reservoirs that furnish a large part of the Mexican capital have fallen to historic lows, as low rainfall, climate change and mismanagement exacerbate the problem.
Socioeconomic disparity is just as influential as climate change and population growth when it comes to explaining why so many cities are struggling with their water supply, researchers say.
"We are depleting volumes of water that took hundreds, thousands of years to store. Sooner or later it will run out," says Mexico City's outgoing water system director.
Officials in the South African city of 3.7 million are restricting water usage amid fears it will run out of water by April 21. Experts say the crisis has been exacerbated by rapid population growth.
Californians face a mandated 25 percent reduction in water use, after they failed to meet previous goals. The new restrictions will take effect in the summer months.