{"data":{"id":"us/40-cfr-421.245","jurisdiction":"us","citation":"40 CFR 421.245","heading":"Pretreatment standards for existing sources.","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. The mass of wastewater pollutants in secondary nickel process wastewater introduced into a POTW must not exceed the following values:\n(a) Slag reclaim tailings.\nPSES for the Secondary Nickel Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of slag input to reclaim process\nChromium (total) 5.653 2.313\nCopper 24.410 12.850\nNickel 24.670 16.320\n(b) Acid reclaim leaching filtrate.\nPSES for the Secondary Nickel Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of acid reclaim nickel produced\nChromium (total) 2.198 0.899\nCopper 9.491 4.995\nNickel 9.590 6.344\n(c) Acid reclaim leaching belt filter backwash\nPSES for the Secondary Nickel Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of acid reclaim nickel produced\nChromium (total) 0.528 0.216\nCopper 2.278 1.199\nNickel 2.302 1.523","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY","Subpart V—Secondary Nickel 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":"313ca9402b80b7d6d1299f140d30a040753444e1eed5652adea6fdfb54c8141a","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.244","next":"us/40-cfr-421.246"},"notice":"GroundRules: Original legal text. Not legal advice."}