About 40% of Philadelphians drink bottled water at home because they don’t trust the H20 that flows from their faucets, according to a study by researchers at the University of Pennsylvania. Most are people of color and low-income residents. Now the city has mounted a campaign — including a new “water bar” — to convince residents to ditch plastic bottles and drink from the tap. But why don’t Philadelphians trust the city’s water in the first place? WHYY reporters Dana Bate and Catalina Jaramillo explain on this episode of The Why.