Why American cities are struggling to supply safe drinking water

Residents of Jackson, 密西西比州; Flint, 密歇根州; and parts of New York City, Baltimore and the state of Hawaii have all dealt with contaminated water supply over the years. Why are so many cities having problems with their drinking water? Shannon Marquez, dean of global engagement and professor of water, sanitation and hygiene at Columbia University, joins John Yang to discuss.

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