{"data":{"id":"us/40-cfr-421.315","jurisdiction":"us","citation":"40 CFR 421.315","heading":"Pretreatment standards for existing sources.","body":"Except as provided in 40 CFR 403.7, any existing source subject to this subpart which introduces polutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in secondary tungsten and cobalt process wastewater introduced into a POTW shall not exceed the following values:\n(a) Tungsten detergent wash and rinse.\nPSES for the Secondary Tungsten and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten scrap washed\nCopper 0.250 0.119\nNickel 0.107 0.072\nAmmonia (as N) 25.990 11.430\nCobalt 0.538 0.236\nTungsten 0.679 0.302\n(b) Tungsten leaching acid.\nPSES for the Secondary Tungsten and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten produced\nCopper 3.291 1.569\nNickel 1.414 0.951\nAmmonia (as N) 342.700 150.700\nCobalt 7.096 3.111\nTungsten 8.947 3.985\n(c) Tungsten post-leaching wash and rinse.\nPSES for the Secondary Tungsten and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten produced\nCopper 6.583 3.137\nNickel 2.829 1.903\nAmmonia (as N) 685.600 301.400\nCobalt 14.194 6.223\nTungsten 17.900 7.972\n(d) Synthetic scheelite filtrate.\nPSES for the Secondary Tungsten and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of synthetic scheelite produced\nCopper 21.330 10.170\nNickel 9.164 6.165\nAmmonia (as N) 2,221.000 976.300\nCobalt 45.984 20.160\nTungsten 57.980 25.820\n(e) Tungsten carbide leaching wet air pollution control.\nPSES for the Secondary Tungsten and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten carbide scrap\nCopper 2.241 1.068\nNickel 0.963 0.648\nAmmonia (as N) 233.400 102.600\nCobalt 4.833 2.119\nTungsten 6.093 2.714\n(f) Tungsten carbide wash water.\nPSES for the Secondary Tungsten and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten carbide produced\nCopper 10.670 5.083\nNickel 4.583 3.083\nAmmonia (as N) 1,111.000 488.300\nCobalt 22.999 10.083\nTungsten 29.000 12.920\n(g) Cobalt sludge leaching wet air pollution control.\nPSES for the Secondary Tungsten 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 from cobalt sludge\nCopper 45.800 21.830\nNickel 19.680 13.240\nAmmonia (as N) 4,770.000 2,097.000\nCobalt 98.756 43.295\nTungsten 124.500 55.460\n(h) Crystallization decant.\nPSES for the Secondary Tungsten 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 53.310 25.410\nNickel 22.910 15.410\nAmmonia (as N) 5,552.000 2,441.000\nCobalt 114.954 50.397\nTungsten 144.9 64.56\n(i) Acid wash decant.\nPSES for the Secondary Tungsten 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 24.400 11.630\nNickel 10.490 7.053\nAmmonia (as N) 2,541.000 1,117.000\nCobalt 52.611 23.065\nTungsten 66.34 29.55\n(j) Cobalt hydroxide filtrate.\nPSES for the Secondary Tungsten 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 72.510 34.560\nNickel 31.160 20.960\nAmmonia (as N) 7,551.000 3,320.000\nCobalt 156.346 68.543\nTungsten 197.1 87.8\n(k) Cobalt hydroxide filter cake wash.\nPSES for the Secondary Tungsten 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 139.600 66.510\nNickel 59.970 40.340\nAmmonia (as N) 14,530.000 6,389.000\nCobalt 300.094 131.932\nTungsten 379.400 169.000","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 AC—Secondary Tungsten 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":"f450538cb57106f874f8dacb063584c994650f00fa680d7c35b45fce23d1bf30","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.314","next":"us/40-cfr-421.316"},"notice":"GroundRules: Original legal text. Not legal advice."}