{"data":{"id":"us/40-cfr-421.326","jurisdiction":"us","citation":"40 CFR 421.326","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 secondary uranium process wastewater introduced into a POTW shall not exceed the following values:\n(a) Refinery sump filtrate.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium processed in the refinery\nChromium (total) 27.14 11.00\nCopper 93.88 44.74\nNickel 40.34 27.14\nFluoride 2,567.00 1,459.00\n(b) Slag leach reslurry.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium processed in the refinery\nChromium (total) 1.689 0.685\nCopper 5.844 2.785\nNickel 2.511 1.689\nFluoride 159.800 90.860\n(c) Solvent extraction raffinate filtrate.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium processed in the refinery\nChromium (total) 2.357 0.955\nCopper 8.152 3.885\nNickel 3.503 2.357\nFluoride 222.900 126.700\n(d) Digestion wet air pollution control.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium processed in the refinery\nChromium (total) 0.000 0.000\nCopper 0.000 0.000\nNickel 0.000 0.000\nFluoride 0.000 0.000\n(e) Evaporation and denitration wet air pollution control.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium trioxide produced\nChromium (total) 0.000 0.000\nCopper 0.000 0.000\nNickel 0.000 0.000\nFluoride 0.000 0.000\n(f) Hydrofluorination alkaline scrubber.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium tetrafluoride produced\nChromium (total) 0.007 0.003\nCopper 0.026 0.012\nNickel 0.011 0.007\nFluoride 0.700 0.398\n(g) Hydrofluorination water scrubber.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium tetrafluoride produced\nChromium (total) 0.000 0.000\nCopper 0.000 0.000\nNickel 0.000 0.000\nFluoride 0.000 0.000\n(h) Magnesium reduction and casting floor wash.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium trioxide produced\nChromium (total) 0.011 0.005\nCopper 0.039 0.018\nNickel 0.017 0.011\nFluoride 1.054 0.599\n(i) Laundry wastewater.\nPSNS for the Secondary Uranium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of uranium produced by magnesium reduction\nChromium (total) 0.036 0.014\nCopper 0.123 0.059\nNickel 0.053 0.036\nFluoride 3.360 1.910","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 AD—Secondary Uranium 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":"129af0e716a3b4ff8e7d05c57eb34c9a8d796b0dd6f00b0242ed006dd75c3b59","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.325","next":"us/40-cfr-421.327"},"notice":"GroundRules: Original legal text. Not legal advice."}