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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 K - Subpart K—Primary Columbium-Tantalum Subcategory
§ 421.110 - Applicability: Description of the primary columbium-tantalum subcategory.
§ 421.111 - Specialized definitions.
§ 421.112 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.113 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.114 - Standards of performance for new sources.
§ 421.115 - Pretreatment standards for existing sources.
§ 421.116 - Pretreatment standards for new sources.
§ 421.117 - [Reserved]
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