Maximum Contaminant Levels (MCLs)

Maximum Contaminant Levels (MCLs) Promulgated Under the Safe Drinking Water Act Chemical CAS No. MCL (mg/l) Arsenic 7440-38-2 0.05 Barium 7440-39-3 1.0 Benzene 71-343-2 0.005 Cadmium 7440-43-9 0.01 Carbon tetrachloride 56-23-5 0.005 Chromium (hexavalent) 7440-47-3 0.05 2,4-Dichlorophenoxy acetic acid 94-75-7 0.1 1,4-Dichlorobenzene 106-46-7 0.075 1,2-Dichloroethane 107-06-2 0.005 1,1-Dichloroethylene 75-35-4 0.007 Endrin 75-20-8 0.0002 Fluoride 7 4.0 Lindane 58-89-9 0.004 Lead 7439-92-1 0.05 Mercury 7439-97-6 0.002 Methoxychlor 72-43-5 0.1 Nitrate 10.0 Selenium 7782-49-2 0.01 Silver 7440-22-4 0.05 Toxaphene 8001-35-2 0.005 1,1,1-Trichloroethane 71-55-6 0.2 Trichloroethylene 79-01-6 0.005 2,4,5-Trichlorophenoxy acetic acid 93-76-5 0.01 Vinyl chloride 75-01-4 0.002 [56 FR 51016, Oct. 9, 1991]