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Source: U.S. Environmental Protection Agency, Federal Register 54, part 124 (29 June 1989):27544.

Source: U.S. Environmental Protection Agency, Federal Register 54, part 124 (29 June 1989):27544.

and disinfection) and total coliform standards promulgated on June 29, 1989. (54 FR pt. 124 [29 June 1989]: 27486, 27544; U.S. EPA 1989)

Table 4.6.2 provides the EPA's secondary standards that set levels of drinking water contaminants that affect the aesthetic value of drinking water, such as taste, odor, color, and appearance. These standards are not enforceable by the federal government, but states are encouraged to adopt them. States can establish higher or lower levels based on local conditions, such as availability of alternative source waters, provided that public health and welfare are not adversely affected.

In some areas of the country, raw surface water is used directly as a domestic water supply. California has issued standards for such water used as a source of drinking water. Table 4.6.3 presents these California standards as an example.

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