{"data":{"id":"us/40-cfr-421.144","jurisdiction":"us","citation":"40 CFR 421.144","heading":"Standards of performance for new sources.","body":"Any new source subject to this subpart shall achieve the following new source performance standards:\n(a) Sodium Antimonate Autoclave Wastewater.\nNSPS for the Primary Antimony Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of antimony contained in sodium antimonate product\nAntimony 30.150 13.440\nArsenic 21.720 9.687\nMercury 2.344 0.937\nTotal suspended solids 234.400 187.500\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Fouled Anolyte.\nNSPS for the Primary Antimony Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of antimony metal produced by electrowinning\nAntimony 30.150 13.440\nArsenic 21.720 9.687\nMercury 2.344 0.937\nTotal suspended solids 234.400 187.500\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Cathode Antimony Wash Water.\nNSPS for the Primary Antimony Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of antimony metal produced by electrowinning\nAntimony 60.310 26.870\nArsenic 43.430 19.370\nMercury 4.687 1.875\nTotal suspended solids 468.700 375.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.","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 N—Primary Antimony 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":"27eec1e4cda4f01b7c62a3851f7769e4897d254d37fe943ecd9284b3cac83331","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.143","next":"us/40-cfr-421.145"},"notice":"GroundRules: Original legal text. Not legal advice."}