Code of Federal Regulations · Section
§ 421.20 — Applicability: Description Of The Primary Aluminum Smelting Subcategory
40 C.F.R. § 421.20
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The provisions of this subpart are applicable to discharges resulting from the production of aluminum from alumina in the Hall-Heroult process.
Authorizing Statute
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Effluent limitations33 U.S.C. § 1311