RALEIGH, N.C. (AP) — North Carolina Gov. Roy Cooper is asking federal official to set standards for a chemical he recently asked a manufacturer to stop dumping into a river that provides drinking water along the coast.

In a letter Monday, Cooper told the Environmental Protection Agency he needs rules on the discharge of a chemical named GenX so he can make his request to the company mandatory.

The chemical is a byproduct of manufacturing and was making its way into the Cape Fear River from Chemours' plant in Fayetteville.

The company agreed to Cooper's request to stop releasing the chemical last month.

Scientists say there have been no definitive studies about how the chemical affects humans.

The Cape Fear River provides drinking water for Bladen, Brunswick, New Hanover and Pender counties.