{"data":{"id":"us/40-cfr-414.91","jurisdiction":"us","citation":"40 CFR 414.91","heading":"Toxic pollutant effluent limitations and standards for direct discharge point sources that use end-of-pipe biological treatment.","body":"(a) Any point source subject to this subpart must achieve discharges not exceeding the quantity (mass) determined by multiplying the process wastewater flow subject to this subpart times the concentrations in the following table.\n(b) In the case of chromium, copper, lead, nickel, zinc, and total cyanide, the discharge quantity (mass) shall be determined by multiplying the concentrations listed in the following table for these pollutants times the flow from metal-bearing waste streams for the metals and times the flow from cyanide bearing waste streams for total cyanide. The metal-bearing waste streams and cyanide-bearing waste streams are defined as those waste streams listed in appendix A of this part, plus any additional OCPSF process wastewater streams identified by the permitting authority on a case-by-case basis as metal or cyanide bearing based upon a determination that such streams contain significant amounts of the pollutants identified above. Any such streams designated as metal or cyanide bearing must be treated independently of other metal or cyanide bearing waste streams unless the permitting authority determines that the combination of such streams, prior to treatment, with the appendix A waste streams will result in substantial reduction of these pollutants. This determination must be based upon a review of relevant engineering, production, and sampling and analysis information.\nEffluent characteristics Effluent limitations BAT and NSPS 1\nMaximum for any one day Maximum for any monthly average\nAcenaphthene 59 22\nAcenaphthylene 59 22\nAcrylonitrile 242 96\nAnthracene 59 22\nBenzene 136 37\nBenzo(a)anthracene 59 22\n3,4-Benzofluoranthene 61 23\nBenzo(k)fluoranthene 59 22\nBenzo(a)pyrene 61 23\nBis(2-ethylhexyl) phthalate 279 103\nCarbon Tetrachloride 38 18\nChlorobenzene 28 15\nChloroethane 268 104\nChloroform 46 21\n2-Chlorophenol 98 31\nChrysene 59 22\nDi-n-butyl phthalate 57 27\n1,2-Dichlorobenzene 163 77\n1,3-Dichlorobenzene 44 31\n1,4-Dichlorobenzene 28 15\n1,1-Dichloroethane 59 22\n1,2-Dichloroethane 211 68\n1,1-Dichloroethylene 25 16\n1,2-trans-Dichloroethylene 54 21\n2,4-Dichlorophenol 112 39\n1,2-Dichloropropane 230 153\n1,3-Dichloropropylene 44 29\nDiethyl phthalate 203 81\n2,4-Dimethylphenol 36 18\nDimethyl phthalate 47 19\n4,6-Dinitro-o-cresol 277 78\n2,4-Dinitrophenol 123 71\n2,4-Dinitrotoluene 285 113\n2,6-Dinitrotoluene 641 255\nEthylbenzene 108 32\nFluoranthene 68 25\nFluorene 59 22\nHexachlorobenzene 28 15\nHexachlorobutadiene 49 20\nHexachloroethane 54 21\nMethyl Chloride 190 86\nMethylene Chloride 89 40\nNaphthalene 59 22\nNitrobenzene 68 27\n2-Nitrophenol 69 41\n4-Nitrophenol 124 72\nPhenanthrene 59 22\nPhenol 26 15\nPyrene 67 25\nTetrachloroethylene 56 22\nToluene 80 26\nTotal Chromium 2,770 1,110\nTotal Copper 3,380 1,450\nTotal Cyanide 1,200 420\nTotal Lead 690 320\nTotal Nickel 3,980 1,690\nTotal Zinc 2 2,610 1,050\n1,2,4-Trichlorobenzene 140 68\n1,1,1-Trichloroethane 54 21\n1,1,2-Trichloroethane 54 21\nTrichloroethylene 54 21\nVinyl Chloride 268 104\n1 All units are micrograms per liter.\n2 Total Zinc for Rayon Fiber Manufacture that uses the viscose process and Acrylic Fiber Manufacture that uses the zinc chloride/solvent process is 6,796 µg/l and 3,325 µg/l for maximum for any one day and maximum for monthly average, respectively.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 414—ORGANIC CHEMICALS, PLASTICS, AND SYNTHETIC FIBERS","Subpart I—Direct Discharge Point Sources That Use End-of-Pipe Biological Treatment"],"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":"90c649ff145defd02de793725db6269b18b68bbfaecaa603a8a975590381eab8","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-414.90","next":"us/40-cfr-414.100"},"notice":"GroundRules: Original legal text. Not legal advice."}