US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 421 — NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORYSubpart A — Bauxite Refining Subcategory421.1640 C.F.R. § 421.16Pretreatment standards for new sources.Last amended: 2016Year: 2026Length: 29 wordsOfficial source Cite as 40 C.F.R. § 421.16 (2026)Any new sources subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403. [50 FR 38342, Sept. 20, 1985]Previous40 C.F.R. § 421.15