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TABLE 4.1 <br />USEPA NATIONAL SECONDARY DRINKING WATER CONTAMINANT STANDARDS <br />Contaminant <br />Effects <br />SMCL—mg/L <br />Aluminum <br />Colored water <br />0.05 to 0.2 <br />Chloride <br />Salty taste <br />250 <br />Color <br />Visible tint <br />15 color units <br />Copper <br />Metallic taste, blue-green stain <br />1.0 <br />Corrosivity <br />Metallic taste, corrosion, fixture staining <br />Non -corrosive <br />Fluoride <br />Tooth discoloration <br />2 <br />Foaming Agents <br />Frothy, cloudy, bitter taste, odor <br />0.5 <br />Iron <br />Rusty color, sediment, metallic taste, <br />reddish or orange staining <br />0.3 <br />Manganese <br />Black to brown color, black staining, bitter <br />metallic taste <br />0.05 <br />Odor <br />"Rotten egg", musty, or chemical smell <br />3 Ton <br />pH <br />Low pH - bitter metallic taste, corrosion; <br />high pH - slippery feel, soda taste, deposits <br />6.5-8.5 <br />Silver <br />Skin discoloration, graying of the white of <br />the eye <br />0.10 <br />Sulfate <br />Salty taste <br />250 <br />Total Dissolved Solids (TDS) <br />Hardness; deposits, colored water; staining; <br />salty taste <br />500 <br />Zinc <br />Metallic taste <br />5 <br />City of Ramsey, Minnesota – M21.34343 Page 4-6 <br />Water System Study Prepared by Bolton & Menk, Inc. <br />