(a) If you have a new or reconstructed affected source, you must comply with this subpart according to paragraph (a)(1) or (2) of this section, whichever is applicable.

(1) If the initial startup of your affected source is before September 28, 2004, then you must comply with the compliance options, operating requirements, and work practice requirements for new and reconstructed sources in this subpart no later than September 28, 2004, except as otherwise specified in paragraph (e) of this section or elsewhere in this subpart.

(2) If the initial startup of your affected source is after September 28, 2004, then you must comply with the compliance options, operating requirements, and work practice requirements for new and reconstructed sources in this subpart upon initial startup of your affected source, except as otherwise specified in paragraph (e) of this section or elsewhere in this subpart.

(b) If you have an existing affected source, you must comply with the compliance options, operating requirements, and work practice requirements for existing sources no later than October 1, 2007, except as otherwise specified in paragraph (e) of this section or elsewhere in this subpart.

(c) If you have an area source that increases its emissions or its potential to emit such that it becomes a major source of HAP, you must be in compliance with this subpart by October 1, 2007 or upon initial startup of your affected source as a major source, whichever is later.

(d) You must meet the notification requirements according to the schedule in § 63.2280 and according to 40 CFR part 63, subpart A. Some of the notifications must be submitted before you are required to comply with the compliance options, operating requirements, and work practice requirements in this subpart.

(e) The compliance dates in paragraphs (e)(1) and (2) of this section apply for the compliance options, operating requirements, and work practice requirements that became effective on July 6, 2026. The compliance options, operating requirements, and work practice requirements that became effective on July 6, 2026, are listed in paragraph (e)(3) of this section.

(1) If construction or reconstruction of your affected source is commenced after May 18, 2023, you must comply with the compliance options, operating requirements, and work practice requirements listed in paragraph (e)(3) of this section beginning on July 6, 2026, or upon initial startup, whichever is later.

(2) If construction or reconstruction of your affected source is commenced on or before May 18, 2023, you must comply with the compliance options, operating requirements, and work practice requirements listed in paragraph (e)(3) of this section beginning on July 6, 2029, except as otherwise specified for mixed PCWP process streams in § 63.2240(d)(5).

(3) The compliance options, operating requirements, and work practice requirements that became effective on July 6, 2026, include the compliance options and operating requirements in § 63.2240(d) and (e) and tables 2 (rows 6 to 12), 1C, 1D, 1E, 4 (rows 12 to 19), 5 (rows 9 to 12), and 7 (rows 8 to 14) to this subpart; and the work practice requirements § 63.2241(d) through (g) and tables 3 (rows 9 to 14), 6 (rows 9 to 14), 8 (rows 9 to 17) and 11 to this subpart.