---
kind: "section"
citation: "40 C.F.R. § 61.191"
title: "40"
number: "61.191"
heading: "Definitions."
url: "https://uscodex.org/cfr/40/61.191"
---

# §61.191. Definitions.


As used in this subpart, all terms not defined here have the meaning given them in the Clean Air Act or [subpart A of part 61](/cfr/40/part61-subpartA.md). The following terms shall have the following specific meanings:

- (a) Facility means all buildings, structures and operations on one contiguous site.
- (b) Source means any building, structure, pile, impoundment or area used for interim storage or disposal that is or contains waste material containing radium in sufficient concentration to emit radon-222 in excess of this standard prior to remedial action.

## Notes

### Source

Source: 54 FR 51701, Dec. 15, 1989, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 38 FR 8826, Apr. 6, 1973, unless otherwise noted.