Failing infrastructure endangers drinking water systems across the U.S.

Deep inside a complex of huge tanks, drinking water for Iowa's capital city is constantly cleansed of the harmful nitrates that come from the state's famously rich farmland. Without Des Moines Water Works, the region of 500,000 people that it serves wouldn't have a thriving economy that has become a magnet for tech companies such as Microsoft. But after decades of ceaseless service, the utility is confronting an array of problems: Water mains are cracking open hundreds of times every year. River...