### Question
What does underground injection mean?


### Answer
**Underground injection** has the following meaning in *42 U.S.C. § 300h*:

> the subsurface emplacement of fluids by well injection

#### Citation:
  - *42 U.S.C. § 300h*
  - Heading: **CHAPTER 6-THE CHILDREN'S BUREAU > SUBCHAPTER XII-SAFETY OF PUBLIC WATER SYSTEMS > Part C-Protection of Underground Sources of Drinking Water**

