{"data":{"id":"us/40-cfr-421.204","jurisdiction":"us","citation":"40 CFR 421.204","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) Spent battery electrolyte.\nNSPS for the Secondary Mercury Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of mercury produced from batteries\nLead 0.030 0.014\nMercury 0.016 0.006\nTotal suspended solids 1.590 1.272\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Acid wash and rinse water.\nNSPS for the Secondary Mercury Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of mercury washed and rinsed\nLead 0.00056 0.00026\nMercury 0.00030 0.00012\nTotal suspended solids 0.03000 0.02400\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Furnace wet air pollution control.\nNSPS for the Secondary Mercury Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of mercury processed through furnace\nLead 0.000 0.000\nMercury 0.000 0.000\nTotal suspended solids 0.000 0.000\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 R—Secondary Mercury 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":"1fc6616833615b163f0dee67b79f696afd587b2d21936502ef20e512b35b3f62","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.202-421.203","next":"us/40-cfr-421.205"},"notice":"GroundRules: Original legal text. Not legal advice."}