---
kind: "section"
citation: "40 C.F.R. § 63.8683"
title: "40"
number: "63.8683"
heading: "When must I comply with this subpart?"
url: "https://uscodex.org/cfr/40/63.8683"
---

# §63.8683. When must I comply with this subpart?

- (a) If you have a new or reconstructed affected source and start up:
  - (1) On or before April 29, 2003, then you must comply with the requirements for new and reconstructed sources in this subpart no later than April 29, 2003.
  - (2) After April 29, 2003, then you must comply with the requirements for new and reconstructed sources in this subpart upon startup.
- (b) If you have an existing affected source, you must comply with the requirements for existing sources no later than May 1, 2006.
- (c) If you have an area source that increases its emissions or its potential to emit such that it becomes a (or part of a) major source as defined in [§ 63.2](/cfr/40/63.2.md), then the following requirements apply:
  - (1) Any portion of the existing facility that becomes a new or reconstructed affected source must be in compliance with this subpart upon startup or by April 29, 2003, whichever is later.
  - (2) All other parts of the source to which this subpart applies must be in compliance with this subpart by 3 years after the date the source becomes a major source.
- (d) You must meet the notification requirements in [§ 63.8692](/cfr/40/63.8692.md) according to the schedules in §§ [63.8692](/cfr/40/63.8692.md) and [63.9(a) through (f)](/cfr/40/63.9.md?p=a..f) and [(h)](/cfr/40/63.9.md?p=h). Some of the notifications must be submitted before you are required to comply with the emission limitations in this subpart.

## Notes

### Amendments

[68 FR 24577, May 7, 2003, as amended at 85 FR 14548, Mar. 12, 2020]

### Source

Source: 68 FR 24577, May 7, 2003, unless otherwise noted.

### Authority

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

### Source

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

### Amendments

[68 FR 24577, May 7, 2003, as amended at 85 FR 14548, Mar. 12, 2020]