{"data":{"id":"us/40-cfr-421.26","jurisdiction":"us","citation":"40 CFR 421.26","heading":"Pretreatment standards for new sources.","body":"Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in primary aluminum process wastewater introduced into a POTW shall not exceed the following values:\n(a) Subpart B—Anode and Cathode Paste Plant Wet Air Pollution Control.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of paste produced\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .000 .000\n(b) Subpart B—Anode Contact Cooling and Briquette Quenching.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of anodes cast\nBenzo(a)pyrene 0.007 0.003\nNickel .115 .077\nFluoride 12.440 5.518\n(c) Subpart B—Anode Bake Plant Wet Air Pollution Control.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of anodes baked\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .000 .000\n(d) Subpart B—Cathode Reprocessing (Operated With Dry Potline Scrubbing and Not Commingled With Other Process or Nonprocess Waters).\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cryolite recovered\nBenzo(a)pyrene 1.181 0.547\nCyanide 157.600 70.060\nNickel 80.570 35.030\nFluoride 29,430.000 13,310.000\n(e) Subpart B—Cathode Reprocessing (Operated With Dry Potline Scrubbing and Commingled With Other Process or Nonprocess Waters).\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cryolite recovered\nBenzo(a)pyrene 1.181 0.547\nCyanide 157.600 70.060\nNickel 19.270 12.960\nFluoride 2,084.000 924.800\n(f) Subpart B—Potline Wet Air Pollution Control.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum produced from electrolytic reduction\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .000 .000\n(g) Subpart B—Potroom Wet Air Pollution Control.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum produced from electrolytic reduction\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .000 .000\n(h) Subpart B—Potline SO2 Emissions Wet Air Pollution Control.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum produced from electrolytic reduction\nBenzo(a)pyrene 0.045 0.021\nNickel .738 .496\nFluoride 79.790 35.400\n(i) Subpart B—Degassing Wet Air Pollution Control.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum produced from electrolytic reduction\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .000 .000\n(j) Subpart B—Pot Repair and Pot Soaking.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum produced from electrolytic reduction\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .000 .000\n(k) Subpart B—Direct Chill Casting Contact Cooling.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of aluminum product from direct chill casting\nBenzo(a)pyrene (1) (1)\nNickel .731 .492\nFluoride 79.080 35.090\n1 There shall be no discharge allowance for this pollutant.\n(l) Subpart B—Continuous Rod Casting Contact Cooling.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pound per million pounds) of aluminum product from rod casting\nBenzo(a)pyrene (1) (1)\nNickel .057 .038\nFluoride 6.188 2.746\n1 There shall be no discharge allowance for this pollutant.\n(m) Subpart B—Stationary Casting or Shot Casting Contact Cooling.\nPSNS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pound per million pounds) of aluminum product from stationary casting or shot casting\nBenzo(a)pyrene .000\nNickel .000 .000\nFluoride .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 B—Primary 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":"b190b8ace9437b243cec8d0209b949edda6de044733d3d8c84360d04d6b54b21","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.25","next":"us/40-cfr-421.27"},"notice":"GroundRules: Original legal text. Not legal advice."}