---
kind: "section"
citation: "42 U.S.C. § 7661"
title: "42"
title_heading: "The Public Health and Welfare"
number: "7661"
heading: "Definitions"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/42/7661"
units:
  - "Chapter 85 — Air Pollution Prevention and Control"
  - "Subchapter V — Permits"
---

# §7661. Definitions


As used in this subchapter—

- (1) **Affected source—** The term “affected source” shall have the meaning given such term in subchapter IV–A.
- (2) **Major source—** The term “major source” means any [stationary source](/usc/42/7602.md?p=z) (or any group of [stationary sources](/usc/42/7602.md?p=z) located within a contiguous area and under common control) that is either of the following:
  - (A) A [major source](#2) as defined in [section 7412 of this title](/usc/42/7412.md).
  - (B) A [major stationary source](/usc/42/7602.md?p=j) as defined in [section 7602 of this title](/usc/42/7602.md) or part D of subchapter I.
- (3) **Schedule of compliance—** The term “schedule of compliance” means a schedule of remedial measures, including an enforceable sequence of actions or operations, leading to compliance with an [applicable implementation plan](/usc/42/7602.md?p=q), [emission standard](/usc/42/7602.md?p=k), [emission limitation](/usc/42/7602.md?p=k), or emission prohibition.
- (4) **Permitting authority—** The term “permitting authority” means the [Administrator](/usc/42/7602.md?p=a) or the [air pollution control agency](/usc/42/7602.md?p=b) authorized by the [Administrator](/usc/42/7602.md?p=a) to carry out a permit program under this subchapter.

## Source credit

(July 14, 1955, ch. 360, title V, § 501, as added Pub. L. 101–549, title V, § 501, Nov. 15, 1990, 104 Stat. 2635.)