U.S. Code
Regulations
Constitution
Sort by Rank
Titles Ascending
Titles Descending
10 per page
25 Result/page
50 Result/page
x
Search
Search guide
U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
All Titles
Title 40
Chapter I
Part 421
Subpart D - Subpart D—Primary Copper Smelting Subcategory
§ 421.40 - Applicability: Description of the primary copper smelting subcategory.
§ 421.41 - Specialized definitions.
§ 421.42 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.43 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.44 - Standards of performance for new sources.
§ 421.45 - [Reserved]
§ 421.46 - Pretreatment standards for new sources.
§ 421.47 - [Reserved]
Download the GovRegs app!
