### Question
What does new source mean?


### Answer
**New source** has the following meaning in *40 CFR § 401.11*:

> any building, structure, facility or installation from which there is or may be the discharge of pollutants, the construction of which is commenced after the publication of proposed regulations prescribing a standard of performance under section 306 of the Act which will be applicable to such source if such standard is thereafter promulgated in accordance with section 306 of the Act.

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

