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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 W - Subpart W—Primary Precious Metals and Mercury Subcategory
§ 421.250 - Applicability: Description of the primary precious metals and mercury subcategory.
§ 421.251 - Specialized definitions.
§ 421.252 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.253 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.254 - Standards of performance for new sources.
§ 421.255 - [Reserved]
§ 421.256 - Pretreatment standards for new sources.
§ 421.257 - [Reserved]
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