{"data":{"id":"us/40-cfr-420.95","jurisdiction":"us","citation":"40 CFR 420.95","heading":"Pretreatment standards for existing sources (PSES).","body":"Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.\n(a) Sulfuric acid (spent acid solutions and rinse waters)—(1) Rod, wire, and coil.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.000526 0.000175\nZinc 0.000701 0.000234\n(2) Bar, billet, and bloom.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.000169 0.0000563\nZinc 0.000225 0.0000751\n(3) Strip, sheet, and plate.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.000338 0.000113\nZinc 0.000451 0.000150\n(4) Pipe, tube, and other products.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.000939 0.000313\nZinc 0.00125 0.000417\n(5) Fume scrubber.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nLead 0.0368 0.0123\nZinc 0.0491 0.0164\nNote: The above limitations are applicable to each fume scrubber associated with sulfuric acid pickling operations.\n(b) Hydrochloric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire, and coil.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.000920 0.000307\nZinc 0.00123 0.000409\n(2) Strip, sheet, and plate.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.000526 0.000175\nZinc 0.000701 0.000234\n(3) Pipe, tube, and other products.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nLead 0.00192 0.000638\nZinc 0.00255 0.000851\n(4) Fume scrubber.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nLead 0.0368 0.0123\nZinc 0.0491 0.0164\nNote: The above limitations shall be applicable for each fume scrubber associated with hydrochloric acid pickling operations.\n(5) Acid regeneration (absorber vent scrubber).\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nLead 0.245 0.0819\nZinc 0.327 0.109\nNote: The above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants.\n(c) Combination acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire, and coil.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nChromium 0.00213 0.000852\nNickel 0.00192 0.000638\n(2) Bar, billet, and bloom.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nChromium 0.000960 0.000384\nNickel 0.000864 0.000288\n(3) Strip, sheet, and plate—continuous.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nChromium 0.00626 0.00250\nNickel 0.00563 0.00188\n(4) Strip, sheet, and plate—batch.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nChromium 0.00192 0.000768\nNickel 0.00173 0.000576\n(5) Pipe, tube, and other products.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nChromium 0.00322 0.00129\nNickel 0.00289 0.000964\n(6) Fume scrubber.\nSubpart I\nPollutant or pollutant property Pretreatment standards for existing sources\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nChromium 0.0819 0.0327\nNickel 0.0735 0.0245\nNote: The above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","Subpart I—Acid Pickling 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":"d586acbe6a3868dda6662380605cb96e45c338c840e1e78fa0d6fb5637b3aedf","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-420.94","next":"us/40-cfr-420.96"},"notice":"GroundRules: Original legal text. Not legal advice."}