### Question
What does secondary drinking water regulation mean?


### Answer
**Secondary drinking water regulation** has the following meaning in *42 U.S.C. § 300f*:

> a regulation which applies to public water systems and which specifies the maximum contaminant levels which, in the judgment of the Administrator, are requisite to protect the public welfare

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

