{"data":{"id":"us/40-cfr-467.32","jurisdiction":"us","citation":"40 CFR 467.32","heading":"Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.","body":"Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available:\nSubpart C\nCore\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum extruded\nChromium 0.16 0.066\nCyanide 0.11 0.044\nZinc 0.53 0.22\nAluminum 2.34 1.16\nOil and grease 7.32 4.39\nSuspended solids 15.0 7.13\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nSubpart C\nExtrusion Press Leakage\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum extruded\nChromium 0.65 0.27\nCyanide 0.43 0.18\nZinc 2.16 0.90\nAluminum 9.51 4.73\nOil and grease 29.56 17.74\nSuspended solids 60.60 28.82\npH (1) (1)\n1 With the range of 7.0 to 10.0 at all times.\nSubpart C\nDirect Chill Casting Contact Cooling Water\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum cast\nChromium 0.59 0.24\nCyanide 0.39 0.16\nZinc 1.94 0.81\nAluminum 8.55 4.26\nOil and grease 26.58 15.95\nSuspended solids 54.49 25.92\npH (1) (1)\n1 The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste stream is discharged separately and without commingling with any other wastewater in which case the pH shall be within the range of 6.0 to 10.0 at all times.\nSubpart C\nPress Heat Treatment Contact Cooling Water\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum quenched\nChromium 3.39 1.39\nCyanide 2.24 0.93\nZinc 11.25 4.70\nAluminum 49.55 24.66\nOil and grease 154.10 92.46\nSuspended solids 315.91 150.25\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nSubpart C\nSolution Heat Treatment Contact Cooling Water\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum quenched\nChromium 3.39 1.39\nCyanide 2.24 0.93\nZinc 11.25 4.70\nAluminum 49.55 24.66\nOil and grease 154.10 92.46\nSuspended solids 315.91 150.25\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nSubpart C\nCleaning or Etching Bath\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum cleaned or etched\nChromium 0.079 0.032\nCyanide 0.052 0.022\nZinc 0.26 0.109\nAluminum 1.15 0.573\nOil and grease 3.58 2.15\nSuspended solids 7.34 3.49\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nSubpart C\nCleaning or Etching Rinse\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum cleaned or etched\nChromium 6.12 2.51\nCyanide 4.04 1.67\nZinc 20.31 8.49\nAluminum 89.46 44.52\nOil and grease 278.24 166.95\nSuspended solids 570.39 271.29\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nSubpart C\nCleaning or Etching Scrubber Liquor\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum cleaned or etched\nChromium 7.00 2.86\nCyanide 4.61 1.91\nZinc 23.22 9.70\nAluminum 102.24 50.88\nOil and grease 318.00 190.80\nSuspended solids 651.90 310.05\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nSubpart C\nDegassing Scrubber Liquor\nPollutant or pollutant property BPT effluent limitations\nMaximum for any 1 day Maximum for monthly average\nmg/off-kg (lb/million off-lbs) of aluminum degassed\nChromium 1.15 0.47\nCyanide 0.76 0.32\nZinc 3.81 1.59\nAluminum 16.78 8.35\nOil and grease 52.18 31.31\nSuspended solids 106.97 50.88\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 467—ALUMINUM FORMING POINT SOURCE CATEGORY","Subpart C—Extrusion 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":"d6bfd1933d699417ed62923af79d8d986c93781c5e799d83be0edecff4785e99","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-467.31","next":"us/40-cfr-467.33"},"notice":"GroundRules: Original legal text. Not legal advice."}