Water contamination is threatening residents of Mexico City, the Mexican capital, where many people rely heavily on surrounding water basins for fresh water.
One of the main sources is a network of canals constructed during the time of the Aztecs.
Booming development and expansion in the much hailed "mega city" is polluting the canals at an alarming level.
Al Jazeera's Franc Contreras reports from Mexico City.
Source: Al Jazeera