Human bodies require iron to function properly, but iron, like many substances, is toxic at high dosages. However, you could not consume enough water to cause toxic levels of iron in your body.
The Environmental Protection Agency considers iron in drinking water as a secondary contaminant, which means it does not have a direct impact on health. Although it won’t harm your health, iron will stain clothes and plumbing fixtures. You can stop the iron, before it enters your home, with an iron filter and water softener.