Part 421 — Nonferrous Metals Manufacturing Point Source Category

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

• §421.1 Applicability.
• §421.2 Reserved
• §421.3 Monitoring and reporting requirements.
• §421.4 Compliance date for pretreatment standards for existing sources (PSES).
• §421.5 Removal allowances for pretreatment standards.