[Code of Federal Regulations]

[Title 40, Volume 22]

[Revised as of July 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR141.51]



[Page 433]

 

                   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

                                                              [micro]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]