{"data":{"id":"us/40-cfr-471.83","jurisdiction":"us","citation":"40 CFR 471.83","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 H—NSPS. There shall be no discharge of process wastewater pollutants.\n(b) Rolling spent emulsions.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc rolled with emulsions\nChromium 0.0005 0.0002\nCopper 0.002 0.0009\nCyanide 0.0003 0.0001\nZinc 0.002 0.0006\nOil and grease 0.014 0.014\nTSS 0.021 0.017\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Rolling contact cooling water.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc rolled with contact cooling water\nChromium 0.020 0.009\nCopper 0.069 0.037\nCyanide 0.011 0.004\nZinc 0.055 0.023\nOil and grease 0.536 0.536\nTSS 0.804 0.643\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Drawing spent emulsions.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc drawn with emulsions\nChromium 0.002 0.0009\nCopper 0.008 0.004\nCyanide 0.001 0.0005\nZinc 0.006 0.003\nOil and grease 0.058 0.058\nTSS 0.087 0.070\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times\n(e) Direct chill casting contact cooling water.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc cast by the direct chill method\nChromium 0.019 0.008\nCopper 0.065 0.031\nCyanide 0.010 0.004\nZinc 0.052 0.021\nOil and grease 0.505 0.505\nTSS 0.758 0.606\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Stationary casting contact cooling water—subpart H—NSPS. There shall be no discharge of process wastewater pollutants.\n(g) Heat treatment contact cooling water.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc heat treated\nChromium 0.029 0.012\nCopper 0.098 0.047\nCyanide 0.016 0.006\nZinc 0.078 0.032\nOil and grease 0.763 0.763\nTSS 1.15 0.916\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Surface treatment spent baths.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc surface treated\nChromium 0.033 0.014\nCopper 0.114 0.054\nCyanide 0.018 0.007\nZinc 0.091 0.038\nOil and grease 0.887 0.887\nTSS 1.33 1.07\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(i) Surface treatment rinse.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc surface treated\nChromium 0.133 0.054\nCopper 0.459 0.219\nCyanide 0.072 0.029\nZinc 0.365 0.151\nOil and grease 3.58 3.58\nTSS 5.37 4.30\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(j) Alkaline cleaning spent baths.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc alkaline cleaned\nChromium 0.002 0.0006\nCopper 0.005 0.002\nCyanide 0.0007 0.0003\nZinc 0.004 0.002\nOil and grease 0.036 0.036\nTSS 0.054 0.043\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(k) Alkaline cleaning rinse.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc alkaline cleaned\nChromium 0.626 0.259\nCopper 2.17 1.03\nCyanide 0.338 0.135\nZinc 1.73 0.710\nOil and grease 16.9 16.9\nTSS 25.4 20.3\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(l) Sawing or grinding spent emulsions.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc sawed or ground with emulsions\nChromium 0.009 0.004\nCopper 0.031 0.015\nCyanide 0.005 0.002\nZinc 0.025 0.010\nOil and grease 0.235 0.235\nTSS 0.357 0.286\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(m) Electrocoating rinse.\nSubpart H—NSPS\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/off-kg (pounds per million off-pounds) of zinc electrocoated\nChromium 0.085 0.035\nCopper 0.293 0.140\nCyanide 0.046 0.019\nZinc 0.234 0.096\nOil and grease 2.29 2.29\nTSS 3.44 2.75\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times\n(n) Degreasing spent solvents—subpart H—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 H—Zinc 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":"175d1e4a1a6fcc582b67ae45b311629b0f4d4d3e150dc217cd6fcad009fd11aa","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-471.82","next":"us/40-cfr-471.84"},"notice":"GroundRules: Original legal text. Not legal advice."}