[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: 40CFR141.41]

[Page 423-424]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 141--NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents
 
  Subpart E--Special Regulations, Including Monitoring Regulations and 
                         Prohibition on Lead Use
 
Sec. 141.41  Special monitoring for sodium.

    (a) Suppliers of water for community public water systems shall 
collect and analyze one sample per plant at the entry point of the 
distribution system for the determination of sodium concentration 
levels; samples must be collected and analyzed annually for systems 
utilizing surface water sources in whole or in part, and at least every 
three years for systems utilizing solely ground water sources. The 
minimum number of samples required to be taken by the system shall be 
based on the number of treatment plants used by the system, except that 
multiple wells drawing raw water from a single aquifer may, with the 
State approval, be considered one treatment plant for determining the 
minimum number of samples. The supplier of water may be required by the 
State to collect and analyze water samples for sodium more frequently in 
locations where the sodium content is variable.
    (b) The supplier of water shall report to EPA and/or the State the 
results of the analyses for sodium within the first 10 days of the month 
following the month in which the sample results were received or within 
the first 10 days following the end of the required monitoring period as 
stipulated by the State, whichever of these is first. If more than 
annual sampling is required the supplier shall report the average sodium 
concentration within 10 days of the month following the month in which 
the analytical results of the last sample used for the annual average 
was received. The supplier of water shall not be required to report the 
results to EPA where the State has adopted this regulation and results 
are reported to the State. The supplier shall report the results to EPA 
where the State has not adopted this regulation.
    (c) The supplier of water shall notify appropriate local and State 
public health officials of the sodium levels by written notice by direct 
mail within three months. A copy of each notice required to be provided 
by this paragraph shall be sent to EPA and/or the State within 10 days 
of its issuance. The supplier of water is not required to notify 
appropriate local and State public health officials of the sodium levels

[[Page 424]]

where the State provides such notices in lieu of the supplier.
    (d) Analyses for sodium shall be conducted as directed in 
Sec. 141.23(k)(1).

[45 FR 57345, Aug. 27, 1980, as amended at 59 FR 62470, Dec. 5, 1994]