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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 I - Subpart I—Metallurgical Acid Plants Subcategory
§ 421.90 - Applicability: Description of the metallurgical acid plants subcategory.
§ 421.91 - Specialized definitions.
§ 421.92 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
§ 421.93 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
§ 421.94 - Standards of performance for new sources.
§ 421.95 - Pretreatment standards for existing sources.
§ 421.96 - Pretreatment standards for new sources.
§ 421.97 - [Reserved]
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