Appendix I to Part 257 -- Maximum Contaminant Levels (MCLs)

  Maximum Contaminant Levels (MCLs) Promulgated Under the Safe Drinking
                                Water Act
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                                                                MCL (mg/
                     Chemical                         CAS No.      l)
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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
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[56 FR 51016, Oct. 9, 1991]