{"data":{"id":"us/40-cfr-471.43","jurisdiction":"us","citation":"40 CFR 471.43","heading":"New source performance standards (NSPS).","body":"Any new source subject to this subpart must achieve the following new source performance standards (NSPS):\n(a) Rolling Spent Neat Oils—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.\n(b) Rolling spent emulsions.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals rolled with emulsions\nCadmium 0.026 0.012\nCopper 0.147 0.077\nCyanide 0.023 0.010\nSilver 0.032 0.013\nOil and grease 1.54 0.925\nTSS 3.16 1.51\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Drawing spent neat oils—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.\n(d) Drawing spent emulsions.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals drawn with emulsions\nCadmium 0.017 0.007\nCopper 0.091 0.048\nCyanide 0.014 0.006\nSilver 0.020 0.008\nOil and grease 0.950 0.570\nTSS 1.95 0.927\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Drawing spent soap solutions.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals drawn with soap solutions\nCadmium 0.001 0.0005\nCopper 0.006 0.003\nCyanide 0.0009 0.0004\nSilver 0.002 0.0006\nOil and grease 0.063 0.038\nTSS 0.128 0.061\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Metal powder production atomization wastewater.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals powder wet atomized\nCadmium 2.27 1.00\nCopper 12.7 6.68\nCyanide 1.94 0.802\nSilver 2.74 1.14\nOil and grease 134 80.2\nTSS 274 131\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(g) Heat treatment contact cooling water.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals heat treated\nCadmium 0.142 0.063\nCopper 0.793 0.417\nCyanide 0.121 0.050\nSilver 0.171 0.071\nOil and grease 8.34 5.01\nTSS 17.1 8.13\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Semi-continuous and continuous casting contact cooling water.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals cast by the semi-continuous or continuous method\nCadmium 0.350 0.155\nCopper 1.96 1.03\nCyanide 0.299 0.124\nSilver 0.423 0.175\nOil and grease 20.6 12.4\nTSS 42.3 20.1\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(i) Stationary casting contact cooling water—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.\n(j) Direct chill casting contact cooling water.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals cast by the direct chill method\nCadmium 0.367 0.162\nCopper 2.05 1.08\nCyanide 0.313 0.130\nSilver 0.443 0.184\nOil and grease 21.6 13.0\nTSS 44.3 21.1\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(k) Shot casting contact cooling water.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals shot cast\nCadmium 0.125 0.055\nCopper 0.698 0.367\nCyanide 0.107 0.044\nSilver 0.151 0.063\nOil and grease 7.34 4.41\nTSS 15.1 7.16\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(l) Wet air pollution control scrubber blowdown—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.\n(m) Pressure bonding contact cooling water.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals and base metal pressure bonded\nCadmium 0.029 0.013\nCopper 0.159 0.084\nCyanide 0.024 0.010\nSilver 0.034 0.014\nOil and grease 1.67 1.00\nTSS 3.43 1.63\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(n) Surface treatment spent baths.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals surface treated\nCadmium 0.033 0.015\nCopper 0.183 0.097\nCyanide 0.028 0.012\nSilver 0.040 0.017\nOil and grease 1.93 1.16\nTSS 3.95 1.88\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(o) Surface treatment rinse.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals surface treated\nCadmium 0.210 0.093\nCopper 1.17 0.616\nCyanide 0.179 0.074\nSilver 0.253 0.105\nOil and grease 12.3 7.39\nTSS 25.3 12.0\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(p) Alkaline cleaning spent baths.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned\nCadmium 0.021 0.009\nCopper 0.114 0.060\nCyanide 0.018 0.007\nSilver 0.025 0.010\nOil and grease 1.20 0.720\nTSS 2.46 1.17\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(q) Alkaline cleaning rinse.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned\nCadmium 0.381 0.168\nCopper 2.13 1.112\nCyanide 0.325 0.135\nSilver 0.459 0.191\nOil and grease 22.4 13.5\nTSS 45.9 21.9\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(r) Alkaline cleaning pre-bonding wastewater.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals and base metal cleaned prior to bonding\nCadmium 0.400 0.174\nCopper 2.21 1.16\nCyanide 0.337 0.139\nSilver 0.476 0.197\nOil and grease 23.2 13.9\nTSS 47.6 22.6\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(s) Tumbling or burnishing wastewater.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals tumbled or burnished\nCadmium 0.412 0.182\nCopper 2.30 1.21\nCyanide 0.351 0.145\nSilver 0.496 0.206\nOil and grease 24.2 14.5\nTSS 49.6 23.6\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(t) Sawing or grinding spent neat oils—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.\n(u) Sawing or grinding spent emulsions.\nSubpart D—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of precious metals sawed or ground with emulsions\nCadmium 0.032 0.014\nCopper 0.178 0.094\nCyanide 0.027 0.011\nSilver 0.038 0.016\nOil and grease 1.87 1.12\nTSS 3.83 1.82\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(v) Degreasing spent solvents—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 471—NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY","Subpart D—Precious Metals Forming 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":"55a60cb3cc39480ab3e13092ddb5c08aead2a3b9baf131dac7e82a16cb30bc8e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-471.42","next":"us/40-cfr-471.44"},"notice":"GroundRules: Original legal text. Not legal advice."}