[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: 40CFR141.13]



[Page 353-354]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 141_NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents

 

                  Subpart B_Maximum Contaminant Levels

 

Sec. 141.13  Maximum contaminant levels for turbidity.



    The maximum contaminant levels for turbidity are applicable to both 

community water systems and non-community water systems using surface 

water sources in whole or in part. The maximum contaminant levels for 

turbidity in drinking water, measured at a representative entry point(s) 

to the distribution system, are:



    Editorial Note: At 54 FR 27527, June 29, 1989, Sec. 141.13 was 

amended by adding introductory text, effective December 31, 1990.



[[Page 354]]



However, introductory text already exists. The added text follows.

    The requirements in this section apply to unfiltered systems until 

December 30, 1991, unless the State has determined prior to that date, 

in writing pursuant to Sec. 1412(b)(7)(C)(iii), that filtration is 

required. The requirements in this section apply to filtered systems 

until June 29, 1993. The requirements in this section apply to 

unfiltered systems that the State has determined, in writing pursuant to 

Sec. 1412(b)(7)(C)(iii), must install filtration, until June 29, 1993, 

or until filtration is installed, whichever is later.

    (a) One turbidity unit (TU), as determined by a monthly average 

pursuant to Sec. 141.22, except that five or fewer turbidity units may 

be allowed if the supplier of water can demonstrate to the State that 

the higher turbidity does not do any of the following:

    (1) Interfere with disinfection;

    (2) Prevent maintenance of an effective disinfectant agent 

throughout the distribution system; or

    (3) Interfere with microbiological determinations.

    (b) Five turbidity units based on an average for two consecutive 

days pursuant to Sec. 141.22.



[40 FR 59570, Dec. 24, 1975]