[Code of Federal Regulations]
[Title 40, Volume 19]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR141.51]

[Page 425]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 141--NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents
 
    Subpart F--Maximum Contaminant Level Goals and Maximum Residual 
                        Disinfectant Level Goals
 
Sec. 141.51  Maximum contaminant level goals for inorganic contaminants.

    (a) [Reserved]
    (b) MCLGs for the following contaminants are as indicated:

------------------------------------------------------------------------
                  Contaminant                          MCLG (mg/l)
------------------------------------------------------------------------
Antimony......................................                     0.006
Arsenic.......................................                  zero \1\
Asbestos......................................    7 Million fibers/liter
                                                 (longer than 10 [mu]m).
Barium........................................                         2
Beryllium.....................................                      .004
Cadmium.......................................                     0.005
Chromium......................................                       0.1
Copper........................................                       1.3
Cyanide (as free Cyanide).....................                        .2
Fluoride......................................                       4.0
Lead..........................................                      zero
Mercury.......................................                     0.002
Nitrate.......................................         10 (as Nitrogen).
Nitrite.......................................          1 (as Nitrogen).
Total Nitrate+Nitrite.........................         10 (as Nitrogen).
Selenium......................................                      0.05
Thallium......................................                     .0005
------------------------------------------------------------------------
\1\ This value for arsenic is effective January 23, 2006. Until then,
  there is no MCLG.


[50 FR 47155, Nov. 14, 1985, as amended at 52 FR 20674, June 2, 1987; 56 
FR 3593, Jan. 30, 1991; 56 FR 26548, June 7, 1991; 56 FR 30280, July 1, 
1991; 57 FR 31846, July 17, 1992; 60 FR 33932, June 29, 1995; 66 FR 
7063, Jan. 22, 2001]