40 CFR § 20.1 - Applicability.
The regulations of this part apply to certifications by the Administrator of water or air pollution control facilities for purposes of section 169 of the Internal Revenue Code of 1954, as amended, 26 U.S.C. 169, as to which the amortization period began after December 31, 1975. Certification of air or water pollution control facilities as to which the amortization period began before January 1, 1976, will continue to be governed by Environmental Protection Agency regulations published November 25, 1971, at 36 FR 22382. Applicable regulations of the Department of Treasury are at 26 CFR 1.169et seq.