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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 N - Subpart N—Primary Antimony Subcategory
§ 421.140 - Applicability: Description of the primary antimony subcategory.
§ 421.141 - Specialized definitions.
§ 421.142 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.143 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.144 - Standards of performance for new sources.
§ 421.145 - [Reserved]
§ 421.146 - Pretreatment standards for new sources.
§ 421.147 - [Reserved]
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