{"data":{"id":"us/40-cfr-appendix-i-to-part-257","jurisdiction":"us","citation":"40 CFR Appendix I to Part 257","heading":"Appendix I to Part 257—Maximum Contaminant Levels (MCLs)","body":"Maximum Contaminant Levels (MCLs) Promulgated Under the Safe Drinking Water Act\nChemical CAS No. MCL (mg/l)\nArsenic 7440-38-2 0.05\nBarium 7440-39-3 1.0\nBenzene 71-343-2 0.005\nCadmium 7440-43-9 0.01\nCarbon tetrachloride 56-23-5 0.005\nChromium (hexavalent) 7440-47-3 0.05\n2,4-Dichlorophenoxy acetic acid 94-75-7 0.1\n1,4-Dichlorobenzene 106-46-7 0.075\n1,2-Dichloroethane 107-06-2 0.005\n1,1-Dichloroethylene 75-35-4 0.007\nEndrin 75-20-8 0.0002\nFluoride 7 4.0\nLindane 58-89-9 0.004\nLead 7439-92-1 0.05\nMercury 7439-97-6 0.002\nMethoxychlor 72-43-5 0.1\nNitrate 10.0\nSelenium 7782-49-2 0.01\nSilver 7440-22-4 0.05\nToxaphene 8001-35-2 0.005\n1,1,1-Trichloroethane 71-55-6 0.2\nTrichloroethylene 79-01-6 0.005\n2,4,5-Trichlorophenoxy acetic acid 93-76-5 0.01\nVinyl chloride 75-01-4 0.002","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER I—SOLID WASTES","PART 257—CRITERIA FOR CLASSIFICATION OF SOLID WASTE DISPOSAL FACILITIES AND PRACTICES"],"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":"bcef7b9254966e7114466af9706c1c40f66bc7ca5b13a7589acadc8a5e577cbe","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-257.107","next":"us/40-cfr-appendix-ii-to-part-257"},"notice":"GroundRules: Original legal text. Not legal advice."}