The National Primary Drinking Water Regulations (NPDWR) are legally enforceable primary standards and treatment techniques that apply to public water systems. Primary standards and treatment techniques protect public health by limiting the levels of contaminants in drinking water. This is a compendium of the currently regulated contaminants, including disinfection byproducts, their maximum contaminant level goal (MCLG), maxim um contaminant level (MCL), potential health effects, and common sources of the contaminant.

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