For nearly a month, hundreds of thousands of Iowans have not been allowed to water their lawns—even though there's no drought ...

Nitrate pollution is likely to force more water-use restrictions. Iowa’s problems are uniquely severe: It has plenty of water ...

While Iowa's problems are uniquely severe, nitrate levels are a rising concern in other regions, from California to the Chesapeake Bay.

A charcoal-like material made from leaves and branches that collect on forest floors could be a cheap, sustainable way to ...