{"data":{"id":"us/40-cfr-421.195","jurisdiction":"us","citation":"40 CFR 421.195","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 secondary indium process wastewater introduced into a POTW must not exceed the following values:\n(a) Displacement Supernatant.\nPSES for the Secondary Indium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of indium metal produced\nCadmium 2.105 0.929\nLead 2.600 1.238\nZinc 9.037 3.776\nIndium 2.724 1.114\n(b) Spent Electrolyte.\nPSES for the Secondary Indium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cathode indium produced\nCadmium 12.170 5.370\nLead 15.040 7.160\nZinc 52.270 21.840\nIndium 15.750 6.444","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 Q—Secondary Indium 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":"f9d71be7b5fa3a7ba04b76d8478308abfb03a8ef20da5334eff92e4d00ff057c","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.194","next":"us/40-cfr-421.196"},"notice":"GroundRules: Original legal text. Not legal advice."}