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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Oct 01, 2023
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Title 40
Chapter I
Part 421
Subpart B - Subpart B—Primary Aluminum Smelting Subcategory
§ 421.20 - Applicability: description of the primary aluminum smelting subcategory.
§ 421.21 - Specialized definitions.
§ 421.22 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.23 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.24 - Standards of performance for new sources.
§ 421.25 - [Reserved]
§ 421.26 - Pretreatment standards for new sources.
§ 421.27 - [Reserved]
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