Chemical giant DuPont will pay more than $US50 million ($A68 million) in an environmental settlement after releasing toxic mercury for decades into waterways in west Virginia.

The deal would resolve state and federal litigation over pollution into the Shenandoah Valley waterway from a company factory in Waynesboro. It amounts to the largest environmental damage settlement in Virginia history and the eighth largest in the nation, officials said on Thursday. The money would go to wildlife habitat…