{"data":{"id":"us/40-cfr-464.12","jurisdiction":"us","citation":"40 CFR 464.12","heading":"Effluent limitations guidelines 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, except that non-continuous dischargers shall not be subject to the maximum day and maximum for monthly average mass (kg/1,000 kkg or lb/million lb of metal poured; kg/62.3 million Sm 3 or lb/billion SCF of air scrubbed) effluent limitations for copper, lead, zinc, total phenols, oil and grease, and TSS. For non-continuous dischargers, annual average mass limitations and maximum day and maximum for monthly average concentration (mg/l) limitations shall apply. Concentration limitation and annual average mass limitation shall only apply to non-continuous dischargers.\n(a) Casting Cleaning Operations.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/1,000 kkg (pounds per million pounds) of metal poured\nCopper (T) 0.0771 0.0421\nLead (T) 0.0791 0.039\nZinc (T) 0.114 0.0431\nOil \u0026 grease 3.0 1.0\nTSS 3.80 1.50\npH (1) (1)\n1 Within the range of 7.0 to 10.00 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l)2 (mg/l)2\nCopper (T) 0.77 0.42 0.017\nLead (T) 0.79 0.39 0.022\nZinc (T) 1.14 0.43 0.027\nOil \u0026 grease 30 10 0.501\nTSS 38 15 1.0\npH (3) (3) (3)\n1 kg/1,000 kkg (pounds per million pounds) of metal poured.\n2 These concentrations must be multiplied by the ratio of (12/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.\n3 Within the range of 7.0 to 10.0 at all times.\n(b) Casting Quench Operations.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/1,000 kkg (pounds per million pounds) of metal poured\nCopper (T) 0.0093 0.0051\nLead (T) 0.0096 0.0047\nZinc (T) 0.0138 0.0052\nOil \u0026 grease 0.363 0.121\nTSS 0.46 0.182\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l)2 (mg/l)2\nCopper (T) 0.77 0.42 0.0021\nLead (T) 0.79 0.39 0.0027\nZinc (T) 1.14 0.43 0.0033\nOil \u0026 grease 30 10 0.0605\nTSS 38 15 0.121\npH (3) (3) (3)\n1 kg/1,000 kkg (pounds per million pounds) of metal poured.\n2 These concentrations must be multiplied by the ratio of (1.45/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.\n3 Within the range of 7.0 to 10.0 at all times.\n(c) Die Casting Operations.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/1,000 kkg (pounds per million pounds) of metal poured\nCopper (T) 0.0066 0.0036\nLead (T) 0.0068 0.0034\nZinc (T) 0.0098 0.0037\nTotal Phenols 0.0074 0.0026\nOil \u0026 Grease 0.259 0.0864\nTSS 0.33 0.13\npH (1) (1)\n1 With the range of 7.0 to 10.0 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l) (2) (mg/l) (2)\nCopper (T) 0.77 0.42 0.0015\nLead (T) 0.79 0.39 0.0019\nZinc (T) 1.14 0.43 0.0023\nTotal Phenols 0.86 0.3 0.0017\nOil \u0026 Grease 30 10 0.0432\nTSS 38 15 0.0864\npH (3) (3) (3)\n1 kg/1,000 kkg (pounds per million pounds) of metal poured.\n2 These concentrations must be multiplied by the ratio of (1.04/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.\n3 Within the range of 7.0 to 10.0 at all times,\n(d) Dust Collection Scrubber Operations.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed\nCopper (T) 0.231 0.126\nLead (T) 0.237 0.117\nZinc (T) 0.343 0.129\nTotal Phenols 0.258 0.09\nOil \u0026 Grease 9.01 3.0\nTSS 11.4 4.51\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l)2 mg/l)2\nCopper (T) 0.77 0.42 0.0511\nLead (T) 0.79 0.39 0.0661\nZinc (T) 1.14 0.43 0.0811\nTotal Phenols 0.86 0.3 0.0601\nOil \u0026 Grease 30 10 1.5\nTSS 38 15 3.0\npH (3) (3) (3)\n1 kg/62.3 million SM3 (pounds per billion SCF) of air scrubbed.\n2 These concentrations must be multiplied by the ratio of (0.036/x) where x is the actual normalized process waste-water flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.\n3 Within the range of 7.0 to 10.0 at all times.\n(e) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.\n(f) Investment Casting.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/1,000 kkg (pounds per million pounds) of metal poured\nCopper (T) 8.48 4.63\nLead (T) 8.7 4.3\nZinc (T) 12.6 4.74\nOil and grease 330 110\nTSS 419 165\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l)2 (mg/l)2\nCopper (T) 0.77 0.42 1.87\nLead (T) 0.79 0.39 2.42\nZinc (T) 1.14 0.43 2.97\nOil and grease 30 10 55.1\nTSS 38 15 110\npH (3) (3) (3)\n1 kg/1,000 kkg (pounds per million pounds) of metal poured.\n2 These concentrations must be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.\n3 Within the range of 7.0 to 10.0 at all times.\n(g) Melting Furnace Scrubber Operations.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed\nCopper (T) 3.01 1.64\nLead (T) 3.09 1.52\nZinc (T) 4.45 1.68\nTotal phenols 3.36 1.17\nOil and grease 117 39.1\nTSS 148 58.6\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l) 2 (mg/l) 2\nCopper (T) 0.77 0.42 0.664\nLead (T) 0.79 0.39 0.859\nZinc (T) 1.14 0.43 1.05\nTotal phenols 0.86 0.3 0.781\nOil and grease 30 10 19.5\nTSS 38 15 39.1\npH (2) (3) (3)\n1 kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.\n2 These concentrations must be multiplied by the ratio of (0.468/x) where x is the acutal normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.\n3 Within the range of 7.0 to 10.0 at all times.\n(h) Mold Cooling Operations.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nkg/1,000 kkg (pounds per million pounds) of metal poured\nCopper (T) 0.297 0.162\nLead (T) 0.305 0.151\nZinc (T) 0.44 0.166\nOil and grease 11.6 3.86\nTSS 14.7 5.79\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\nMaximum for any 1 day Maximum for monthly average Annual average 1\n(mg/l) 1 (mg/) 1\nCopper (T) 0.77 0.42 0.0656\nLead (T) 0.79 0.39 0.0849\nZinc (T) 1.14 0.43 0.104\nOil and grease 30 10 1.93\nTSS 38 15 3.86\npH (3) (3) (3)\n1 kg/1,000 kkg (pounds per million pounds) of metal\n2 These concentrations must be multiplied by the ratio of (46.3/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.\n3 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 464—METAL MOLDING AND CASTING POINT SOURCE CATEGORY","Subpart A—Aluminum Casting 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":"8384efb7d42af699fe0d8dbdb95cc35a269bd5248de817ecb6fdd0c709574992","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-464.11","next":"us/40-cfr-464.13"},"notice":"GroundRules: Original legal text. Not legal advice."}