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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 40
Chapter I
Part 421
Subpart AE - Subpart AE—Primary Zirconium and Hafnium Subcategory
§ 421.330 - Applicability: Description of the primary zirconium and hafnium subcategory.
§ 421.331 - Specialized definitions.
§ 421.332 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.333 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.334 - Standards of performance for new sources.
§ 421.335 - [Reserved]
§ 421.336 - Pretreatment standards for new sources.
§ 421.337 - [Reserved]
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