{"data":{"id":"us/40-cfr-279.21","jurisdiction":"us","citation":"40 CFR 279.21","heading":"Hazardous waste mixing.","body":"(a) Mixtures of used oil and hazardous waste must be managed in accordance with § 279.10(b).\n(b) The rebuttable presumption for used oil of § 279.10(b)(1)(ii) applies to used oil managed by generators. Under the rebuttable presumption for used oil of § 279.10(b)(1)(ii), used oil containing greater than 1,000 ppm total halogens is presumed to be a hazardous waste and thus must be managed as hazardous waste and not as used oil unless the presumption is rebutted. However, the rebuttable presumption does not apply to certain metalworking oils/fluids and certain used oils removed from refrigeration units.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER I—SOLID WASTES","PART 279—STANDARDS FOR THE MANAGEMENT OF USED OIL","Subpart C—Standards for Used Oil Generators"],"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":"0c5d1253f5606d49fee30b94e3f4aefb2b5501ba6c9b3a385e5373d6eacc62da","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-279.20","next":"us/40-cfr-279.22"},"notice":"GroundRules: Original legal text. Not legal advice."}