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Iron and Manganese in Household water HE-394 http://www2.ncsu.edu/b...blicat/wgwm/he394.htm1 .- ~ .. ~ v- ~~ N Iron and Manganese in Household water Prepared by: Glenda M. Herman, Extension Housing Specialist e Published by: North Carolina Cooperative Extension service Publication Number: HE-394. Last Electronic Revision: March 1996 (JWM) Iron and manganese are minerals found in drinking water supplies. These minerals wil they may cause reddish-brown or black stains on clothes or household fixtures. Under public water supplies set by the Environmental Protection Agency (EPA), iron and man considered secondary contaminants. Secondary standards apply to substances in water offensive taste, odor, color, corrosion, foaming, or staining but have no direct aff standard Secondary Maximum Contaminant Level (SMCL) for iron is 0.3 milligrams per 1 ppm) and 0.05 mg/L for manganese. Private water supplies are not subject to federal standards can be used as guidelines to evaluate the quality of water from wells or s The four forms of iron and manganese commonly found in drinking water are ferrous, f iron bacteria. Normally, water appears clear when first drawn from the cold water fa it may contain ferric iron or organic iron. soth color the water. Ferric iron precip organic iron does not settle out. In well water, insoluble iron oxide is converted t ferrous (dissolved) iron. Ferrous iron is colorless, but when in contact with air, i creating reddish- brown, solid particles that then settle out as ferric oxide. Manga but forma a brownish-black precipitate and stains. Manganese~is less commonly found than iron, rarely found alone in a water source, and generally found with dissolved Health considerations -The presence of iron and manganese in water is not considered health problem. In fac -concentrations are essential to human health. However, high concentrations of iron m 1 of 5 12/30/97 12:13:09