Part 421. PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
- SUBPART A [§ 421.10 - § 421.16] - Subpart A—Bauxite Refining Subcategory
- SUBPART B [§ 421.20 - § 421.27] - Subpart B—Primary Aluminum Smelting Subcategory
- SUBPART C [§ 421.30 - § 421.37] - Subpart C—Secondary Aluminum Smelting Subcategory
- SUBPART D [§ 421.40 - § 421.47] - Subpart D—Primary Copper Smelting Subcategory
- SUBPART E [§ 421.50 - § 421.57] - Subpart E—Primary Electrolytic Copper Refining Subcategory
- SUBPART F [§ 421.60 - § 421.67] - Subpart F—Secondary Copper Subcategory
- SUBPART G [§ 421.70 - § 421.77] - Subpart G—Primary Lead Subcategory
- SUBPART H [§ 421.80 - § 421.87] - Subpart H—Primary Zinc Subcategory
- SUBPART I [§ 421.90 - § 421.97] - Subpart I—Metallurgical Acid Plants Subcategory
- SUBPART J [§ 421.100 - § 421.107] - Subpart J—Primary Tungsten Subcategory
- SUBPART K [§ 421.110 - § 421.117] - Subpart K—Primary Columbium-Tantalum Subcategory
- SUBPART L [§ 421.120 - § 421.127] - Subpart L—Secondary Silver Subcategory
- SUBPART M [§ 421.130 - § 421.137] - Subpart M—Secondary Lead Subcategory
- SUBPART N [§ 421.140 - § 421.147] - Subpart N—Primary Antimony Subcategory
- SUBPART O [§ 421.150 - § 421.157] - Subpart O—Primary Beryllium Subcategory
- SUBPART P [§ 421.180 - § 421.187] - Subpart P—Primary and Secondary Germanium and Gallium Subcategory
- SUBPART Q [§ 421.190 - § 421.197] - Subpart Q—Secondary Indium Subcategory
- SUBPART R [§ 421.200 - § 421.207] - Subpart R—Secondary Mercury Subcategory
- SUBPART S [§ 421.210 - § 421.217] - Subpart S—Primary Molybdenum and Rhenium Subcategory
- SUBPART T [§ 421.220 - § 421.227] - Subpart T—Secondary Molybdenum and Vanadium Subcategory
- SUBPART U [§ 421.230 - § 421.237] - Subpart U—Primary Nickel and Cobalt Subcategory
- SUBPART V [§ 421.240 - § 421.247] - Subpart V—Secondary Nickel Subcategory
- SUBPART W [§ 421.250 - § 421.257] - Subpart W—Primary Precious Metals and Mercury Subcategory
- SUBPART X [§ 421.260 - § 421.267] - Subpart X—Secondary Precious Metals Subcategory
- SUBPART Y [§ 421.270 - § 421.277] - Subpart Y—Primary Rare Earth Metals Subcategory
- SUBPART Z [§ 421.280 - § 421.287] - Subpart Z—Secondary Tantalum Subcategory
- SUBPART AA [§ 421.290 - § 421.297] - Subpart AA—Secondary Tin Subcategory
- SUBPART AB [§ 421.300 - § 421.307] - Subpart AB—Primary and Secondary Titanium Subcategory
- SUBPART AC [§ 421.310 - § 421.317] - Subpart AC—Secondary Tungsten and Cobalt Subcategory
- SUBPART AD [§ 421.320 - § 421.327] - Subpart AD—Secondary Uranium Subcategory
- SUBPART AE [§ 421.330 - § 421.337] - Subpart AE—Primary Zirconium and Hafnium Subcategory