### Question
How does the law define pollution?


### Answer
Under *40 CFR § 401.11*, **pollution** is defined as:

> the man-made or man induced alteration of the chemical, physical, biological and radiological integrity of water.

#### Citation:
  - *40 CFR § 401.11*
  - Heading: **PART 401—GENERAL PROVISIONS > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS**

