[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: 40CFR141.70]



[Page 440-441]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

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

 

                  Subpart H_Filtration and Disinfection

 

Sec. 141.70  General requirements.



    Source: 54 FR 27527, June 29, 1989, unless otherwise noted.





    (a) The requirements of this subpart H constitute national primary 

drinking water regulations. These regulations establish criteria under 

which filtration is required as a treatment technique for public water 

systems supplied by a surface water source and public



[[Page 441]]



water systems supplied by a ground water source under the direct 

influence of surface water. In addition, these regulations establish 

treatment technique requirements in lieu of maximum contaminant levels 

for the following contaminants: Giardia lamblia, viruses, heterotrophic 

plate count bacteria, Legionella, and turbidity. Each public water 

system with a surface water source or a ground water source under the 

direct influence of surface water must provide treatment of that source 

water that complies with these treatment technique requirements. The 

treatment technique requirements consist of installing and properly 

operating water treatment processes which reliably achieve:

    (1) At least 99.9 percent (3-log) removal and/or inactivation of 

Giardia lamblia cysts between a point where the raw water is not subject 

to recontamination by surface water runoff and a point downstream before 

or at the first customer; and

    (2) At least 99.99 percent (4-log) removal and/or inactivation of 

viruses between a point where the raw water is not subject to 

recontamination by surface water runoff and a point downstream before or 

at the first customer.

    (b) A public water system using a surface water source or a ground 

water source under the direct influence of surface water is considered 

to be in compliance with the requirements of paragraph (a) of this 

section if:

    (1) It meets the requirements for avoiding filtration in Sec. 

141.71 and the disinfection requirements in Sec. 141.72(a); or

    (2) It meets the filtration requirements in Sec. 141.73 and the 

disinfection requirements in Sec. 141.72(b).

    (c) Each public water system using a surface water source or a 

ground water source under the direct influence of surface water must be 

operated by qualified personnel who meet the requirements specified by 

the State.

    (d) Additional requirements for systems serving at least 10,000 

people. In addition to complying with requirements in this subpart, 

systems serving at least 10,000 people must also comply with the 

requirements in subpart P of this part.

    (e) Additional requirements for systems serving fewer than 10,000 

people. In addition to complying with requirements in this subpart, 

systems serving fewer than 10,000 people must also comply with the 

requirements in subpart T of this part.



[54 FR 27527, June 29, 1989, as amended at 63 FR 69516, Dec. 16, 1998; 

67 FR 1836, Jan. 14, 2002]