Scientists worry about lasting damage from Potomac sewage spill

Water samples are taken from the Potomac River in Maryland in January. A massive pipe that moves millions of gallons of sewage ruptured and sent wastewater flowing into the Potomac River northwest of Washington, D.C.

Drinking water around the District of Columbia hasn't been contaminated. But scientists say the environmental damage could be severe.

(Image credit: Nathan Ellgren)