{"data":{"id":"us/40-cfr-466.31","jurisdiction":"us","citation":"40 CFR 466.31","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—BPT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nMetal preparation Coating operation Metal preparation Coating operation\nMetric units—mg/m2 of area processed or coated\nChromium 16.34 6.32 6.63 2.56\nLead 5.84 2.26 5.06 1.96\nNickel 54.85 21.21 38.90 15.04\nZinc 51.73 20.01 21.79 8.43\nAluminum 176.98 68.44 72.35 27.98\nIron 47.85 18.50 24.51 9.48\nOil and grease 777.92 300.84 466.76 108.50\nTSS 1,594.74 616.68 777.92 300.82\npH (1) (1) (1) (1)\nEnglish units—pounds per 1 million ft2 of area processed or coated\nChromium 3.35 1.30 1.37 0.53\nLead 1.20 0.47 1.04 0.40\nNickel 11.24 4.35 7.97 3.08\nZinc 10.6 4.10 4.46 1.73\nAluminum 36.25 14.02 14.82 5.73\nIron 9.80 3.79 5.02 1.94\nOil and grease 159.33 61.61 95.60 36.97\nTSS 326.62 126.33 159.33 61.61\npH (1) (1) (1) (1)\n1 Within the range 7.5 to 10.0 at all times.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 466—PORCELAIN ENAMELING POINT SOURCE CATEGORY","Subpart C—Aluminum Basis Material 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":"6edfa9b49d960969b8b92efaf395326d8528a21402fa0b9e89a2b290b4102b9b","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-466.30","next":"us/40-cfr-466.32"},"notice":"GroundRules: Original legal text. Not legal advice."}