### Question
What does polyfluoroalkyl substance mean?


### Answer
**Polyfluoroalkyl substance** has the following meaning in *15 U.S.C. § 8931*:

> a chemical containing at least one fully fluorinated carbon atom and at least one carbon atom that is not a 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**

