{"data":{"id":"us/40-cfr-421.90","jurisdiction":"us","citation":"40 CFR 421.90","heading":"Applicability: Description of the metallurgical acid plants subcategory.","body":"The provisions of this subpart apply to process wastewater discharges resulting from or associated with the manufacture of by-product sulfuric acid at primary copper smelters, primary zinc facilities, primary lead facilities, and primary molybdenum facilities, including any associated air pollution control or gas-conditioning systems for sulfur dioxide off-gases from pyrometallurgical operations.","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 I—Metallurgical Acid Plants 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":"52cff25239b29396b4399d9aaeae73985e72445cb99ff8f78b0ab56dab2c47f1","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.87","next":"us/40-cfr-421.91"},"notice":"GroundRules: Original legal text. Not legal advice."}