{"data":{"id":"us/40-cfr-421.305","jurisdiction":"us","citation":"40 CFR 421.305","heading":"Pretreatment standards for existing sources.","body":"Except as provided in 40 CFR 403.7 and 403.13, any existing 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 existing sources. The mass of wastewater pollutants in primary and secondary titanium process wastewater introduced into a POTW must not exceed the following values:\n(a) Chlorination off-gas wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of TiCl4 produced\nChromium (total) 0.346 0.140\nLead 0.262 0.122\nNickel 0.515 0.346\nTitanium 0.496 0.215\n(b) Chlorination Area-vent wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of TiCl4 produced\nChromium (total) 0.385 0.156\nLead 0.291 0.135\nNickel 0.572 0.385\nTitanium 0.551 0.239\n(c) TiCl4 handling wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of TiCl4 handled\nChromium (total) 0.069 0.028\nLead 0.052 0.024\nNickel 0.103 0.069\nTitanium 0.099 0.043\n(d) Reduction area wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 1.528 0.620\nLead 1.156 0.537\nNickel 2.272 1.528\nTitanium 2.189 0.950\n(e) Melt cell wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 0.787 0.319\nLead 0.595 0.276\nNickel 1.169 0.787\nTitanium 1.127 0.489\n(f) Chlorine liquefaction wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 11.010 4.463\nLead 8.332 3.868\nNickel 16.370 11.010\nTitanium 15.770 6.844\n(g) Sodium reduction container reconditioning wash water.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 0.474 0.192\nLead 0.359 0.167\nNickel 0.705 0.474\nTitanium 0.679 0.295\n(h) Chip crushing wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 0.848 0.344\nLead 0.642 0.298\nNickel 1.261 0.848\nTitanium 1.215 0.527\n(i) Acid leachate and rinse water.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 4.381 1.776\nLead 3.315 1.539\nNickel 6.512 4.381\nTitanium 6.275 2.723\n(j) Sponge crushing and screening wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium produced\nChromium (total) 0.239 0.097\nLead 0.181 0.084\nNickel 0.356 0.239\nTitanium 0.343 0.149\n(k) Acid pickle and wash water.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium pickled\nChromium (total) 0.023 0.009\nLead 0.017 0.008\nNickel 0.034 0.023\nTitanium 0.032 0.014\n(l) Scrap milling wet air pollution control.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of scrap milled\nChromium (total) 0.084 0.034\nLead 0.064 0.030\nNickel 0.125 0.084\nTitanium 0.120 0.052\n(m) Scrap detergent wash water.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of scrap washed\nChromium (total) 6.684 2.710\nLead 5.058 2.348\nNickel 9.935 6.684\nTitanium 9.574 4.155\n(n) Casting crucible wash water.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium cast\nChromium (total) 0.176 0.072\nLead 0.134 0.062\nNickel 0.262 0.176\nTitanium 0.253 0.110\n(o) Casting contact cooling water.\nPSES for the Primary and Secondary Titanium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of titanium cast\nChromium (total) 27.000 10.950\nLead 20.430 9.486\nNickel 40.140 27.000\nTitanium 38.680 16.780","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 AB—Primary and Secondary Titanium 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":"fe7a8e48c4c40a7d179497ffb087fb42399a09d3ae8ae6a70d7cb86fa82481ba","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.304","next":"us/40-cfr-421.306"},"notice":"GroundRules: Original legal text. Not legal advice."}