GENERAL PROVISIONS

• § 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.

• 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