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Regulations last checked for updates: Jul 02, 2026
Title 40 - Protection of Environment last revised: Aug 02, 2026
All Titles
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]
source:
49 FR 8790, Mar. 8, 1984, unless otherwise noted.
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