{"data":{"id":"us/40-cfr-421.236","jurisdiction":"us","citation":"40 CFR 421.236","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 a 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in primary nickel and cobalt process wastewater introduced into a POTW shall not exceed the following values:\n(a) Raw material dust control.\nPSNS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of copper, nickel, and cobalt in the crushed raw material\nCopper 0.099 0.047\nNickel 0.042 0.028\nAmmonia (as N) 10.260 4.512\nCobalt 0.011 0.005\n(b) Nickel wash water.\nPSNS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of nickel powder washed\nCopper 0.043 0.021\nNickel 0.019 0.013\nAmmonia (as N) 4.515 1.985\nCobalt 0.005 0.002\n(c) Nickel reduction decant.\nPSNS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) nickel produced\nCopper 16.250 7.744\nNickel 6.982 4.697\nAmmonia (as N) 1,692.000 743.900\nCobalt 1.777 0.889\n(d) Cobalt reduction decant.\nPSNS for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cobalt produced\nCopper 27.390 13.050\nNickel 11.770 7.917\nAmmonia (as N) 2,852.000 1,254.000\nCobalt 2.996 1.498","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 U—Primary Nickel and Cobalt 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":"f08b9fb1ae9db04498429837ce0d2ababe34bde36800ba326f3df0a38862a81a","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.235","next":"us/40-cfr-421.237"},"notice":"GroundRules: Original legal text. Not legal advice."}