U.S. Code of Federal Regulations

Regulations most recently checked for updates: Apr 14, 2026

All TitlesTitle 40Chapter IPart 421Subpart V - Subpart V—Secondary Nickel Subcategory
§ 421.240 - Applicability: Description of the secondary nickel subcategory.
§ 421.241 - Specialized definitions.
§§ 421.242-421.243 - §[Reserved]
§ 421.244 - Standards of performance for new sources.
§ 421.245 - Pretreatment standards for existing sources.
§ 421.246 - Pretreatment standards for new sources.
§ 421.247 - [Reserved]
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