{"data":{"id":"us/40-cfr-421.33","jurisdiction":"us","citation":"40 CFR 421.33","heading":"Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.","body":"Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable:\n(a) Subpart C—Scrap Drying Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pound's per million pounds) of aluminum scrap dried\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\n(b) Subpart C—Scrap Screening and Milling.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pound's per million pounds) of aluminum scrap screened and milled\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\n(c) Subpart C—Dross Washing.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pound's per million pounds) of dross washed\nLead 3.043 1.413\nZinc 11.090 4.565\nAluminum 66.410 29.450\nAmmonia (as N) 1,449.000 636.900\n(d) Subpart C—Demagging Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (lb/million lbs) of aluminum demagged\nLead 0.216 0.100\nZinc 0.786 0.324\nAluminum 4.711 2.090\nAmmonia (as N) 102.800 45.180\n(e) Subpart C—Delacquering Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pound's per million pounds) of aluminum delacquered\nLead 0.093 0.043\nZinc 0.340 0.140\nAluminum 2.035 0.903\nAmmonia (as N) 44.389 19.514\nTotal phenolics (4-AAP method) 1 0.004\n1 At the source.\n(f) Subpart C—Direct Chill Casting Contact Cooling.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .372 .173\nZinc 1.356 .558\nAluminum 8.120 3.602\nAmmonia (as N) 177.200 77.880\n(g) Subpart C—Ingot Conveyor Casting Contact Cooling (When Chlorine Demagging Wet Air Pollution Control is Not Practiced On-Site).\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (lb/million lbs) of aluminum cast\nLead 0.019 0.009\nZinc 0.068 0.028\nAluminum 0.409 0.182\nAmmonia (as N) 8.931 3.926\n(h) Subpart C—Ingot Conveyor Casting Contact Cooling (When Chloride Demagging Wet Air Pollution Control is Practiced On Site).\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\n(i) Subpart C—Stationary Casting Contact Cooling.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000\n(j) Subpart C—Shot Casting Contact Cooling.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum cast\nLead .000 .000\nZinc .000 .000\nAluminum .000 .000\nAmmonia (as N) .000 .000","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY","Subpart C—Secondary Aluminum Smelting Subcategory"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"bf9e662ba434614b3a7699274c1e5f35c02cdf1783532781ec1b9aa9d7029932","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.32","next":"us/40-cfr-421.34"},"notice":"GroundRules: Original legal text. Not legal advice."}