What about iron in my drinking water?

Making up at least 5% of the earth’s crust, iron is one of the earth’s most plentiful resources. Rainwater as it infiltrates the soil and underlying geologic formations dissolves iron, causing it to seep into aquifers that serve as sources of groundwater for wells. Although present in drinking water, iron is seldom found at concentrations greater than 10 milligrams per liter (mg/L) or 10 parts per million. However, as little as 0.3 mg/L can cause water to turn a reddish brown color. Iron is not hazardous to health, but it is considered a secondary or aesthetic contaminant. Essential for good health, iron helps transport oxygen in the blood.

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1. Why does my tap water leave spots on my glasses and sometimes limit the flow of water from my showerhead and faucets?
2. Is my tap water hard, and is it safe to drink?
3. What about iron in my drinking water?
4. I've heard there is lead in the City's water. Is that true?
5. Where does the City test our water?