US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 436 — MINERAL MINING AND PROCESSING POINT SOURCE CATEGORYSubpart E — Gypsum Subcategory436.5040 C.F.R. § 436.50Applicability; description of the gypsum subcategory.Last amended: 2016Year: 2026Length: 12 wordsOfficial source Cite as 40 C.F.R. § 436.50 (2026)The provisions of this subpart are applicable to the processing of gypsum.Next40 C.F.R. § 436.51