### Question
How is the "federally required commencement date" defined?


### Answer
The term **federally required commencement date** is defined in *42 U.S.C. § 9658* as follows -

> the date the plaintiff knew (or reasonably should have known) that the personal injury or property damages referred to in subsection (a)(1) of this section were caused or contributed to by the hazardous substance or pollutant or contaminant concerned

#### Citation:
  - *42 U.S.C. § 9658*
  - Heading: **CHAPTER 103-COMPREHENSIVE ENVIRONMENTAL RESPONSE, COMPENSATION, AND LIABILITY > SUBCHAPTER III-MISCELLANEOUS PROVISIONS**

