[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR141.11]

[Page 354-355]
 
                   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.  141.11  Maximum contaminant levels for inorganic chemicals.


    (a) The maximum contaminant level for arsenic applies only to 
community

[[Page 355]]

water systems. The analyses and determination of compliance with the 
0.05 milligrams per liter maximum contaminant level for arsenic use the 
requirements of Sec.  141.23.
    (b) The maximum contaminant level for arsenic is 0.05 milligrams per 
liter for community water systems until January 23, 2006.
    (c) [Reserved]
    (d) At the discretion of the State, nitrate levels not to exceed 20 
mg/l may be allowed in a non-community water system if the supplier of 
water demonstrates to the satisfaction of the State that:
    (1) Such water will not be available to children under 6 months of 
age; and
    (2) The non-community water system is meeting the public 
notification requirements under Sec.  141.209, including continuous 
posting of the fact that nitrate levels exceed 10 mg/l and the potential 
health effects of exposure; and
    (3) Local and State public health authorities will be notified 
annually of nitrate levels that exceed 10 mg/l; and
    (4) No adverse health effects shall result.

[40 FR 59570, Dec. 24, 1975, as amended at 45 FR 57342, Aug. 27, 1980; 
47 FR 10998, Mar. 12, 1982; 51 FR 11410, Apr. 2, 1986; 56 FR 3578, Jan. 
30, 1991; 56 FR 26548, June 7, 1991; 56 FR 30274, July 1, 1991; 56 FR 
32113, July 15, 1991; 60 FR 33932, June 29, 1995; 65 FR 26022, May 4, 
2000; 66 FR 7061, Jan. 22, 2001]