---
kind: "section"
citation: "40 C.F.R. § 63.4083"
title: "40"
number: "63.4083"
heading: "When do I have to comply with this subpart?"
url: "https://uscodex.org/cfr/40/63.4083"
---

# §63.4083. When do I have to comply with this subpart?


The date by which you must comply with this subpart is called the compliance date. The compliance date for each type of affected source is specified in [paragraphs (a) through (c)](#a..c) of this section. The compliance date begins the initial compliance period during which you conduct the initial compliance demonstration described in §§ [63.4140](/cfr/40/63.4140.md), [63.4150](/cfr/40/63.4150.md), and [63.4160](/cfr/40/63.4160.md).

- (a) For a new or reconstructed affected source, the compliance date is the applicable date in paragraph [(a)(1)](#a-1) or [(2)](#a-2) of this section.
  - (1) If the initial startup of your new or reconstructed affected source is before July 23, 2002, the compliance date is July 23, 2002.
  - (2) If the initial startup of your new or reconstructed affected source occurs after July 23, 2002, the compliance date is the date of initial startup of your affected source.
- (b) **For an existing affected source, the compliance date is July 25, 2005.**
- (c) For an area source that increases its emissions or its potential to emit such that it becomes a major source of HAP emissions, the compliance date is specified in paragraphs [(c)(1)](#c-1) and [(2)](#c-2) of this section.
  - (1) For any portion of the source that becomes a new or reconstructed affected source subject to this subpart, the compliance date is the date of initial startup of the affected source, or the date the area source becomes a major source, or July 23, 2002, whichever is latest.
  - (2) For any portion of the source that becomes an existing affected source subject to this subpart, the compliance date is the date 1 year after the area source becomes a major source or July 25, 2005, whichever is later.
- (d) You must meet the notification requirements in [§ 63.4110](/cfr/40/63.4110.md) according to the dates specified in that section and in [subpart A](/cfr/40/subpartA.md) of this part. Some of the notifications must be submitted before the compliance dates described in [paragraphs (a) through (c)](#a..c) of this section.

## Notes

### Source

Source: 67 FR 48262, July 23, 2002, unless otherwise noted.

### Authority

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

### Source

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