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7A <br /> Page 17 <br /> National Secondary Drinking Water Standards <br /> Naiional Secondary Drinking Waier Stantlards are non-enforceable guidelines regulating cantaminants that may cause casmetic effects(such as skin or <br /> tooth discoloration)or aesthetic effects(such as iaste,odor,or colorj in drinking waier.EPA recommends secondary standards to water systems but does <br /> not require systams to comply.However,states may choose to adopt them as enforceable standards. <br /> Contaminant Secondary Sfandard <br /> Aluminum 0.05 to 0.2 mg/L <br /> Chloride 250 mglL <br /> Color 15(color units} <br /> Copper 1.0 mg/L <br /> Corrosivityw w� noncorrosive <br /> Fluoride 2.0 mglL <br /> Foaming Agents 0.5 mglL <br /> Iron 0.3 mglL <br /> Manganese 0.05 mglL <br /> Odor 3 threshold odor number <br /> pH 6.5-8.5 <br /> 5ilver 0.10 mglL <br /> Sulfate 250 mglL <br /> Totai Dissolved Solids 500 mglL <br /> Zinc 5 mgll <br /> _ _ _ .. . _ _ _ __ <br /> Dffice of Wafer(46Q6M) <br /> EPA 81 fi-F-03-016 <br /> www.epa.gav/safewater <br /> June 2003 <br /> 6 <br />