### Question
How is the term highly fluorinated compound defined?


### Answer
The term **highly fluorinated compound** is defined in *15 U.S.C. § 8931* as the following:

> a perfluoroalkyl substance or a polyfluoroalkyl substance with at least one fully fluorinated carbon atom

#### Citation:
  - *15 U.S.C. § 8931*
  - Heading: **CHAPTER 115-PERFLUOROALKYL AND POLYFLUOROALKYL SUBSTANCES AND EMERGING CONTAMINANTS > SUBCHAPTER III-USGS PERFORMANCE STANDARD**

