In this subchapter:

(1)  Director

The term “Director” means the Director of the United States Geological Survey.

(2)  Highly fluorinated compound

(A)  In general

The term “highly fluorinated compound” means a perfluoroalkyl substance or a polyfluoroalkyl substance with at least one fully fluorinated carbon atom.

(B)  Definitions

In this paragraph:

(i)  Fully fluorinated carbon atom

The term “fully fluorinated carbon atom” means a carbon atom on which all the hydrogen substituents have been replaced by fluorine.

(ii)  Perfluoroalkyl substance

The term “perfluoroalkyl substance” means a chemical of which all of the carbon atoms are fully fluorinated carbon atoms.

(iii)  Polyfluoroalkyl substance

The term “polyfluoroalkyl substance” means a chemical containing at least one fully fluorinated carbon atom and at least one carbon atom that is not a fully fluorinated carbon atom.