---
kind: "section"
citation: "40 C.F.R. § 63.600"
title: "40"
number: "63.600"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/63.600"
---

# §63.600. Applicability.

- (a) Except as provided in paragraphs [(c)](#c) and [(d)](#d) of this section, you are subject to the requirements of this subpart if you own or operate a phosphoric acid manufacturing plant that is a major source as defined in [§ 63.2](/cfr/40/63.2.md). You must comply with the emission limitations, work practice standards, and operating parameter requirements specified in this subpart at all times.
- (b) The requirements of this subpart apply to emissions of hazardous air pollutants (HAP) emitted from the following affected sources at a phosphoric acid manufacturing plant:
  - (1) **Each wet-process phosphoric acid process line.**
  - (2) **Each evaporative cooling tower.**
  - (3) **Each phosphate rock dryer.**
  - (4) **Each phosphate rock calciner.**
  - (5) **Each superphosphoric acid process line.**
  - (6) **Each purified phosphoric acid process line.**
  - (7) **Each gypsum dewatering stack.**
  - (8) **Each cooling pond.**
- (c) The requirements of this subpart do not apply to a phosphoric acid manufacturing plant that is an area source as defined in [§ 63.2](/cfr/40/63.2.md).
- (d) The provisions of this subpart do not apply to research and development facilities as defined in [§ 63.601](/cfr/40/63.601.md).

## Notes

### Source

Source: 80 FR 50436, Aug. 19, 2015, unless otherwise noted.

### Authority

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

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.