{"data":{"id":"us/40-cfr-420.93","jurisdiction":"us","citation":"40 CFR 420.93","heading":"Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).","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 available technology economically achievable.\n(a) Sulfuric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.\nSubpart I\nPollutant or pollutant property BAT effluent limitations\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 BAT effluent limitations\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 BAT effluent limitations\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 BAT effluent limitations\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 scrubbers.\nSubpart I\nPollutant or pollutant property BAT effluent limitations\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\nThe above limitations shall be applicable to each fume scrubber associated with a sulfuric acid pickling operation.\n(b) Hydrochloric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.\nSubpart I\nPollutant or pollutant property BAT effluent limitations\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 BAT effluent limitations\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 BAT effuent limitations\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 scrubbers.\nSubpart I\nPollutant or pollutant property BAT effuent limitations\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\nThe above limitations shall be applicable to each fume scrubber associated with a hydrochloric acid pickling operation.\n(5) Acid regeneration (absorber vent scrubber).\nSubpart I\nPollutant or pollutant property BAT effuent limitations\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\nThe above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants.\n(c) Combination acid pickling (spent acid solution and rinse waters)—(1) Rod, wire, and coil.\nSubpart I\nPollutant or pollutant property BAT effluent limitations\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 BAT effluent limitations\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 BAT effluent limitations\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 BAT effluent limitations\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 BAT effluent limitations\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 scrubbers.\nSubpart I\nPollutant or pollutant property BAT effluent limitations\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\nThe 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":"e23c74dc113ca7d70fda740689d15272e768bdbf9c7d3715ad7e60283c9d07be","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-420.92","next":"us/40-cfr-420.94"},"notice":"GroundRules: Original legal text. Not legal advice."}