CFR›Title 21›Chapter I›Part 109›Subpart B ContainsSection 109.30CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart B—Tolerances for Unavoidable Poisonous or Deleterious Substances Sections 109.30 § 109.30 Tolerances for polychlorinated biphenyls (PCB's). Previous A Subpart A—General Provisions