U.S. and Mexican border towns grapple with sewage spilling into the sea

Each day, millions of gallons of sewage cascade through a canyon and into the Pacific Ocean just south of the U.S.-Mexican border.

Each day, millions of gallons of sewage cascade through a canyon and into the Pacific Ocean just south of the U.S.-Mexican border. As any surfer in San Diego knows, summer swells that come from the south will push the toxic brew north.