### Question
How is the term standard of performance defined?


### Answer
The term **standard of performance** is defined in *40 CFR § 401.11* as the following:

> any restriction established by the Administrator pursuant to section 306 of the Act on quantities, rates, and concentrations of chemical, physical, biological, and other constituents which are or may be discharged from new sources into navigable waters, the waters of the contiguous zone or the ocean.

#### Citation:
  - *40 CFR § 401.11*
  - Heading: **Title 40—Protection of Environment > PART 401—GENERAL PROVISIONS > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)**

