Part 421 — Nonferrous Metals Manufacturing Point Source Category

• § 421.1— Applicability.
• § 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 — 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.
• § 421.15— Standards of performance for new sources.
• § 421.16— Pretreatment standards for new sources.

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.
• § 421.26— Pretreatment standards for new sources.

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.

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.
• § 421.46— Pretreatment standards for new sources.

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.
• § 421.56— Pretreatment standards for new sources.

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.

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.

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.

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.

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.

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.

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.

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.

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.
• § 421.146— Pretreatment standards for new sources.

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.
• § 421.156— Pretreatment standards for new sources.

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.

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.

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.
• § 421.206— Pretreatment standards for new sources.

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.
• § 421.216— Pretreatment standards for new sources.

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.
• § 421.226— Pretreatment standards for new sources.

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.
• § 421.236— Pretreatment standards for new sources.

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.

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.
• § 421.256— Pretreatment standards for new sources.

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.

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.

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.
• § 421.286— 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.

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.

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.

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.
• § 421.326— Pretreatment standards for new sources.

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.
• § 421.336— Pretreatment standards for new sources.