A man crosses a bridge over the Poudre River, in Fort Collins, Colo. The picturesque river is the latest prize in the West's water wars, where wilderness advocates usually line up against urban and industrial development.
The village of Hoosick Falls, N.Y., sits along the Hoosick River in eastern New York. Elevated levels of a suspected carcinogen known as PFOA were found in the village's well water, which is now filtered.
Hansi Lo Wang/NPR