### Question
Can you define what process waste water means?


### Answer
**Process waste water** is defined as the following in *40 CFR § 401.11*:

> any water which, during manufacturing or processing, comes into direct contact with or results from the production or use of any raw material, intermediate product, finished product, by-product, or waste product.

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

