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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 L - Subpart L—Secondary Silver Subcategory
§ 421.120 - Applicability: Description of the secondary silver subcategory.
§ 421.121 - Specialized definitions.
§ 421.122 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.123 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.124 - Standards of performance for new sources.
§ 421.125 - Pretreatment standards for existing sources.
§ 421.126 - Pretreatment standards for new sources.
§ 421.127 - [Reserved]
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