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Code of Federal Regulations (Last Updated: November 8, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter N - Effluent Guidelines and Standards |
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Part 421 - Nonferrous Metals Manufacturing Point Source Category |
| Subpart A - Bauxite Refining Subcategory |
| § 421.10 - Applicability; description of the bauxite refining subcategory. |
| § 421.11 - Specialized definitions. |
| § 421.12 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.13 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.14 - [Reserved] |
| § 421.15 - Standards of performance for new sources. |
| § 421.16 - Pretreatment standards for new sources. |
| Subpart AA - Secondary Tin Subcategory |
| § 421.290 - Applicability: Description of the secondary tin subcategory. |
| § 421.291 - Specialized definitions. |
| § 421.292 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.293 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.294 - Standards of performance for new sources. |
| § 421.295 - Pretreatment standards for existing sources. |
| § 421.296 - Pretreatment standards for new sources. |
| § 421.297 - [Reserved] |
| Subpart AB - Primary and Secondary Titanium Subcategory |
| § 421.300 - Applicability: Description of the primary and secondary titanium subcategory. |
| § 421.301 - Specialized definitions. |
| § 421.302 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.303 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.304 - Standards of performance for new sources. |
| § 421.305 - Pretreatment standards for existing sources. |
| § 421.306 - Pretreatment standards for new sources. |
| § 421.307 - [Reserved] |
| Subpart AC - Secondary Tungsten and Cobalt Subcategory |
| § 421.310 - Applicability: Description of the secondary tungsten and cobalt subcategory. |
| § 421.311 - Specialized definitions. |
| § 421.312 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.313 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.314 - Standards of performance for new sources. |
| § 421.315 - Pretreatment standards for existing sources. |
| § 421.316 - Pretreatment standards for new sources. |
| § 421.317 - [Reserved] |
| Subpart AD - Secondary Uranium Subcategory |
| § 421.320 - Applicability: Description of the secondary uranium subcategory. |
| § 421.321 - Specialized definitions. |
| § 421.322 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.323 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.324 - Standards of performance for new sources. |
| § 421.325 - [Reserved] |
| § 421.326 - Pretreatment standards for new sources. |
| § 421.327 - [Reserved] |
| Subpart AE - Primary Zirconium and Hafnium Subcategory |
| § 421.330 - Applicability: Description of the primary zirconium and hafnium subcategory. |
| § 421.331 - Specialized definitions. |
| § 421.332 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.333 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.334 - Standards of performance for new sources. |
| § 421.335 - [Reserved] |
| § 421.336 - Pretreatment standards for new sources. |
| § 421.337 - [Reserved] |
| Subpart B - Primary Aluminum Smelting Subcategory |
| § 421.20 - Applicability: description of the primary aluminum smelting subcategory. |
| § 421.21 - Specialized definitions. |
| § 421.22 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.23 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.24 - Standards of performance for new sources. |
| § 421.25 - [Reserved] |
| § 421.26 - Pretreatment standards for new sources. |
| § 421.27 - [Reserved] |
| Subpart C - Secondary Aluminum Smelting Subcategory |
| § 421.30 - Applicability: Description of the secondary aluminum smelting subcategory. |
| § 421.31 - Specialized definitions. |
| § 421.32 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.33 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.34 - Standards of performance for new sources. |
| § 421.35 - Pretreatment standards for existing sources. |
| § 421.36 - Pretreatment standards for new sources. |
| § 421.37 - [Reserved] |
| Subpart D - Primary Copper Smelting Subcategory |
| § 421.40 - Applicability: Description of the primary copper smelting subcategory. |
| § 421.41 - Specialized definitions. |
| § 421.42 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.43 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.44 - Standards of performance for new sources. |
| § 421.45 - [Reserved] |
| § 421.46 - Pretreatment standards for new sources. |
| § 421.47 - [Reserved] |
| Subpart E - Primary Electrolytic Copper Refining Subcategory |
| § 421.50 - Applicability: Description of the primary electrolytic copper refining subcategory. |
| § 421.51 - Specialized definitions. |
| § 421.52 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.53 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.54 - Standards of performance for new sources. |
| § 421.55 - [Reserved] |
| § 421.56 - Pretreatment standards for new sources. |
| § 421.57 - [Reserved] |
| Subpart F - Secondary Copper Subcategory |
| § 421.60 - Applicability: Description of the secondary copper subcategory. |
| § 421.61 - Specialized definitions. |
| § 421.62 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.63 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.64 - Standards of performance for new sources. |
| § 421.65 - Pretreatment standards for existing sources. |
| § 421.66 - Pretreatment standards for new sources. |
| § 421.67 - [Reserved] |
| Subpart G - Primary Lead Subcategory |
| § 421.70 - Applicability: Description of the primary lead subcategory. |
| § 421.71 - Specialized definitions. |
| § 421.72 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.73 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.74 - Standards of performance for new sources. |
| § 421.75 - Pretreatment standards for existing sources. |
| § 421.76 - Pretreatment standards for new sources. |
| § 421.77 - [Reserved] |
| Subpart H - Primary Zinc Subcategory |
| § 421.80 - Applicability: Description of the primary zinc subcategory. |
| § 421.81 - Specialized definitions. |
| § 421.82 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.83 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.84 - Standards of performance for new sources. |
| § 421.85 - Pretreatment standards for existing sources. |
| § 421.86 - Pretreatment standards for new sources. |
| § 421.87 - [Reserved] |
| Subpart I - Metallurgical Acid Plants Subcategory |
| § 421.90 - Applicability: Description of the metallurgical acid plants subcategory. |
| § 421.91 - Specialized definitions. |
| § 421.92 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.93 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.94 - Standards of performance for new sources. |
| § 421.95 - Pretreatment standards for existing sources. |
| § 421.96 - Pretreatment standards for new sources. |
| § 421.97 - [Reserved] |
| Subpart J - Primary Tungsten Subcategory |
| § 421.100 - Applicability: Description of the primary tungsten subcategory. |
| § 421.101 - Specialized definitions. |
| § 421.102 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.103 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.104 - Standards of performance for new sources. |
| § 421.105 - Pretreatment standards for existing sources. |
| § 421.106 - Pretreatment standards for new sources. |
| § 421.107 - [Reserved] |
| Subpart K - Primary Columbium-Tantalum Subcategory |
| § 421.110 - Applicability: Description of the primary columbium-tantalum subcategory. |
| § 421.111 - Specialized definitions. |
| § 421.112 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.113 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.114 - Standards of performance for new sources. |
| § 421.115 - Pretreatment standards for existing sources. |
| § 421.116 - Pretreatment standards for new sources. |
| § 421.117 - [Reserved] |
| Subpart L - Secondary Silver Subcategory |
| § 421.120 - Applicability: Description of the secondary silver subcategory. |
| § 421.121 - Specialized definitions. |
| § 421.122 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.123 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.124 - Standards of performance for new sources. |
| § 421.125 - Pretreatment standards for existing sources. |
| § 421.126 - Pretreatment standards for new sources. |
| § 421.127 - [Reserved] |
| Subpart M - Secondary Lead Subcategory |
| § 421.130 - Applicability: Description of the secondary lead subcategory. |
| § 421.131 - Specialized definitions. |
| § 421.132 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.133 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.134 - Standards of performance for new sources. |
| § 421.135 - Pretreatment standards for existing sources. |
| § 421.136 - Pretreatment standards for new sources. |
| § 421.137 - [Reserved] |
| Subpart N - Primary Antimony Subcategory |
| § 421.140 - Applicability: Description of the primary antimony subcategory. |
| § 421.141 - Specialized definitions. |
| § 421.142 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.143 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.144 - Standards of performance for new sources. |
| § 421.145 - [Reserved] |
| § 421.146 - Pretreatment standards for new sources. |
| § 421.147 - [Reserved] |
| Subpart O - Primary Beryllium Subcategory |
| § 421.150 - Applicability: Description of the primary beryllium subcategory. |
| § 421.151 - Specialized definitions. |
| § 421.152 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.153 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.154 - Standards of performance for new sources. |
| § 421.155 - [Reserved] |
| § 421.156 - Pretreatment standards for new sources. |
| § 421.157 - [Reserved] |
| Subpart P - Primary and Secondary Germanium and Gallium Subcategory |
| § 421.180 - Applicability: Description of the primary and secondary germanium and gallium subcategory. |
| § 421.181 - Specialized definitions. |
| § 421.182 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.183 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.184 - Standards of performance for new sources. |
| § 421.185 - Pretreatment standards for existing sources. |
| § 421.186 - Pretreatment standards for new sources. |
| § 421.187 - [Reserved] |
| Subpart Q - Secondary Indium Subcategory |
| § 421.190 - Applicability: Description of the secondary indium subcategory. |
| § 421.191 - Specialized definitions. |
| § 421.194 - Standards of performance for new sources. |
| § 421.195 - Pretreatment standards for existing sources. |
| § 421.196 - Pretreatment standards for new sources. |
| § 421.197 - [Reserved] |
| §§ 421.192--421.193 - [Reserved] |
| Subpart R - Secondary Mercury Subcategory |
| § 421.200 - Applicability: Description of the secondary mercury subcategory. |
| § 421.201 - Specialized definitions. |
| § 421.204 - Standards of performance for new sources. |
| § 421.205 - [Reserved] |
| § 421.206 - Pretreatment standards for new sources. |
| § 421.207 - [Reserved] |
| §§ 421.202--421.203 - [Reserved] |
| Subpart S - Primary Molybdenum and Rhenium Subcategory |
| § 421.210 - Applicability: Description of the primary molybdenum and rhenium subcategory. |
| § 421.211 - Specialized definitions. |
| § 421.212 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.213 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.214 - Standards of performance for new sources. |
| § 421.215 - [Reserved] |
| § 421.216 - Pretreatment standards for new sources. |
| § 421.217 - [Reserved] |
| Subpart T - Secondary Molybdenum and Vanadium Subcategory |
| § 421.220 - Applicability: Description of the secondary molybdenum and vanadium subcategory. |
| § 421.221 - Specialized definitions. |
| § 421.222 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.223 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.224 - Standards of performance for new sources. |
| § 421.225 - [Reserved] |
| § 421.226 - Pretreatment standards for new sources. |
| § 421.227 - [Reserved] |
| Subpart U - Primary Nickel and Cobalt Subcategory |
| § 421.230 - Applicability: Description of the primary nickel and cobalt subcategory. |
| § 421.231 - Specialized definitions. |
| § 421.232 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.233 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.234 - Standards of performance for new sources. |
| § 421.235 - [Reserved] |
| § 421.236 - Pretreatment standards for new sources. |
| § 421.237 - [Reserved] |
| Subpart V - Secondary Nickel Subcategory |
| § 421.240 - Applicability: Description of the secondary nickel subcategory. |
| § 421.241 - Specialized definitions. |
| § 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] |
| §§ 421.242--421.243 - [Reserved] |
| Subpart W - Primary Precious Metals and Mercury Subcategory |
| § 421.250 - Applicability: Description of the primary precious metals and mercury subcategory. |
| § 421.251 - Specialized definitions. |
| § 421.252 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.253 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.254 - Standards of performance for new sources. |
| § 421.255 - [Reserved] |
| § 421.256 - Pretreatment standards for new sources. |
| § 421.257 - [Reserved] |
| Subpart X - Secondary Precious Metals Subcategory |
| § 421.260 - Applicability: Description of the secondary precious metals subcategory. |
| § 421.261 - Specialized definitions. |
| § 421.262 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.263 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.264 - Standards of performance for new sources. |
| § 421.265 - Pretreatment standards for existing sources. |
| § 421.266 - Pretreatment standards for new sources. |
| § 421.267 - [Reserved] |
| Subpart Y - Primary Rare Earth Metals Subcategory |
| § 421.270 - Applicability: Description of the primary rare earth metals subcategory. |
| § 421.271 - Specialized definitions. |
| § 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] |
| §§ 421.272--421.273 - [Reserved] |
| Subpart Z - Secondary Tantalum Subcategory |
| § 421.280 - Applicability: Description of the secondary tantalum subcategory. |
| § 421.281 - Specialized definitions. |
| § 421.282 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. |
| § 421.283 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. |
| § 421.284 - Standards of performance for new sources. |
| § 421.285 - [Reserved] |
| § 421.286 - Pretreatment standards for new sources. |
| § 421.287 - [Reserved] |
| 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. |