---
kind: "section"
citation: "40 C.F.R. § 63.620"
title: "40"
number: "63.620"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/63.620"
---

# §63.620. 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 phosphate fertilizer production 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 phosphate fertilizer production plant:
  - (1) Each phosphate fertilizer process line (e.g., diammonium and/or monoammonium phosphate process line).
  - (2) **Each granular triple superphosphate process line.**
  - (3) **Each granular triple superphosphate storage building.**
  - (4) **Evaporative cooling tower.**
- (c) The requirements of this subpart do not apply to a phosphate fertilizer production 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 [§ 63.621](/cfr/40/63.621.md).

## Notes

### Source

Source: 80 FR 50450, 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.