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Iron is not considered hazardous to health. In fact, iron is essential for good health because it transports oxygen in your blood. In the United States, most tap water probably supplies less than 5 percent of the dietary requirement for iron.

Iron is considered a secondary or "aesthetic" contaminant. The present recommended limit for iron in water, 0.3 mg/I (ppm), is based on taste and appearance rather than on any detrimental health effect.

When the level of iron in water exceeds the 0.3 mg/l limit, there is a noticable red, brown, or yellow staining of laundry, glassware, dishes. and household fixtures such as bathtubs and sinks. The water may also have a metallic taste and an offensive odor. Water system piping and fixtures can also become restricted or clogged.