In this subchapter:

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

2. (2) Highly fluorinated compound

   1. (A) In general The term “highly fluorinated compound” means a perfluoroalkyl substance or a polyfluoroalkyl substance with at least one fully fluorinated carbon atom.

   2. (B) Definitions In this paragraph:

      1. (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carbon atom The term “fully fluorinated carbon atom” means a carbon atom on which all the hydrogen substituents have been replaced by fluorine.
      2. (ii) Perfluoroalkyl substance The term “perfluoroalkyl substance” means a chemical of which all of the carbon atoms are fully fluorinated carbon atoms.
      3. (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.

(Pub. L. 116–92, div. F, title LXXIII, § 7331, Dec. 20, 2019, 133 Stat. 2281.)