After abysmally low amounts of rainfall over the last few years, the reservoirs of the Cutzamala water system that supplies over 20 percent of the Mexican capital’s 22 million residents’ usable water are running out.

“If it doesn’t start raining soon, as it is supposed to, these [reservoirs] will run out of water by the end of June,” Oscar Ocampo, a public policy researcher on the environment, water, and energy, told my colleagues over on the Today, Explained podcast.