### Question
How is the term contaminant defined?


### Answer
The term **contaminant** is defined in *42 U.S.C. § 300f* as the following:

> any physical, chemical, biological, or radiological substance or matter in water

#### Citation:
  - *42 U.S.C. § 300f*
  - Heading: **CHAPTER 6A-PUBLIC HEALTH SERVICE > SUBCHAPTER XII-SAFETY OF PUBLIC WATER SYSTEMS > Part A-Definitions**

