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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 AB - Subpart AB—Primary and Secondary Titanium Subcategory
§ 421.300 - Applicability: Description of the primary and secondary titanium subcategory.
§ 421.301 - Specialized definitions.
§ 421.302 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.303 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.304 - Standards of performance for new sources.
§ 421.305 - Pretreatment standards for existing sources.
§ 421.306 - Pretreatment standards for new sources.
§ 421.307 - [Reserved]
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