U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 421Subpart Y - Subpart Y—Primary Rare Earth Metals Subcategory
§ 421.270 - Applicability: Description of the primary rare earth metals subcategory.
§ 421.271 - Specialized definitions.
§§ 421.272-421.273 - §[Reserved]
§ 421.274 - Standards of performance for new sources.
§ 421.275 - Pretreatment standards for existing sources.
§ 421.276 - Pretreatment standards for new sources.
§ 421.277 - [Reserved]
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