{"data":{"id":"us/40-cfr-461.31","jurisdiction":"us","citation":"40 CFR 461.31","heading":"Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).","body":"(a) 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:\n(1) Subpart C—Closed Formation—Double Fill, or Fill and Dump.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.86 0.45\nLead 0.19 0.090\nIron 0.54 0.27\nOil and grease 9.00 5.40\nTSS 18.45 8.78\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(2) Subpart C—Open Formation—Dehydrated.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 20.99 11.05\nLead 4.64 2.21\nIron 16.13 6.74\nOil and grease 221.00 132.60\nTSS 453.05 215.47\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(3) Subpart C—Open Formation—Wet.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.10 0.05\nLead 0.02 0.01\nIron 0.06 0.03\nOil and grease 1.06 0.64\nTSS 2.17 1.03\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(4) Subpart C—Plate Soak.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.040 0.020\nLead 0.009 0.004\nIron 0.030 0.010\nOil and grease 0.420 0.250\nTSS 0.860 0.410\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(5) Subpart C—Battery Wash (with Detergent).\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 1.71 0.90\nLead 0.38 0.18\nIron 1.08 0.55\nOil and grease 18.00 10.80\nTSS 36.90 17.55\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(6) Subpart C—Battery Wash (Water Only).\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 1.12 0.59\nLead 0.25 0.12\nIron 0.71 0.36\nOil and grease 11.80 7.08\nTSS 24.19 11.51\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(7) Subpart C—Direct Chill Lead Casting.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.00040 0.00020\nLead 0.00008 0.00004\nIron 0.00020 0.00010\nOil and grease 0.00400 0.00200\nTSS 0.00800 0.00300\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(8) Subpart C—Mold Release Formulation.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.011 0.006\nLead 0.002 0.001\nIron 0.007 0.004\nOil and grease 0.120 0.072\nTSS 0.246 0.117\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(9) Subpart C—Truck Wash.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead in trucked batteries\nEnglish units—pounds per 1,000,000 pounds of lead in trucked batteries\nCopper 0.026 0.014\nLead 0.005 0.002\nIron 0.016 0.008\nOil and grease 0.280 0.168\nTSS 0.574 0.273\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(10) Subpart C—Laundry.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.21 0.11\nLead 0.05 0.02\nIron 0.13 0.07\nOil and grease 2.18 1.31\nTSS 4.47 2.13\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(11) Subpart C—Miscellaneous Wastewater Streams.\nBPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetric units—mg/kg of lead used\nEnglish units—pounds per 1,000,000 pounds of lead used\nCopper 0.81 0.43\nLead 0.18 0.09\nIron 0.51 0.26\nOil and grease 8.54 5.12\nTSS 17.51 8.33\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) There shall be no discharge allowance for process wastewater pollutants from any battery manufacturing operation other than those battery manufacturing operations listed above.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 461—BATTERY MANUFACTURING POINT SOURCE CATEGORY","Subpart C—Lead 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":"2dcf611696381af1cafa3b8b4c7b3ea9823507c4ed7ba59d55fe69fbec8b29fd","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-461.30","next":"us/40-cfr-461.32"},"notice":"GroundRules: Original legal text. Not legal advice."}