Mexico City is facing a severe water crisis due to a combination of climate change, urban expansion, and inadequate infrastructure. The city's groundwater is depleting rapidly, with a major reservoir no longer able to supply water. Last year was the hottest and driest in at least 70 years, exacerbating the situation. The population growth and poor water management have led to shortages even in areas that previously had sufficient water. The city's aging water network, vulnerable to earthquakes and leaks, compounds the problem. The government's efforts to address the crisis have been criticized as insufficient. The estimated cost to address the crisis is as high as $13.5 billion. The looming "Day Zero" has raised public awareness, but the city's water problems continue to worsen.