Part 421 — Nonferrous Metals Manufacturing Point Source Category
Current through Aug 22, 2025
Authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4.
Source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
Sections
- § 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.
- § 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.
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 421.190 Applicability: Description of the secondary indium subcategory.
- § 421.191 Specialized definitions.
- §§ 421.192-421.193 [Reserved]
- § 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]
- § 421.200 Applicability: Description of the secondary mercury subcategory.
- § 421.201 Specialized definitions.
- §§ 421.202-421.203 [Reserved]
- § 421.204 Standards of performance for new sources.
- § 421.205 [Reserved]
- § 421.206 Pretreatment standards for new sources.
- § 421.207 [Reserved]
- § 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]
- § 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]
- § 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]
- § 421.240 Applicability: Description of the secondary nickel subcategory.
- § 421.241 Specialized definitions.
- §§ 421.242-421.243 [Reserved]
- § 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]
- § 421.250 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]
- § 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]