40 CFR § 63.1621 - What are my compliance dates?

---
identifier: "/us/cfr/t40/s63.1621"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.1621 - What are my compliance dates?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.1621"
section_name: "What are my compliance dates?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---


# 63.1621 What are my compliance dates?

(a) Existing affected sources must be in compliance with the provisions specified in §§ 63.1620 through 63.1629 no later than June 30, 2017.

(b) Affected sources in existence prior to June 30, 2015 must be in compliance with the provisions specified in §§ 63.1650 through 63.1661 by November 21, 2001 and until June 30, 2017. As of June 30, 2017, the provisions of §§ 63.1650 through 63.1661 cease to apply to affected sources in existence prior to June 30, 2015. The provisions of §§ 63.1650 through 63.1661 remain enforceable at a source for its activities prior to June 30, 2017.

(c) If you own or operate a new affected source that commences construction or reconstruction after November 23, 2011, you must comply with the requirements of this subpart by June 30, 2015, or upon startup of operations, whichever is later.

[80 FR 37390, June 30, 2015]