0.3 0.46 Occurs naturally in water as a result of the leaching of iron salts from the earth. Also as a result of corrosion of pipes. However, water has the ability to leach metals from household plumbing. Flushing one or two cups from your tap before consuming water that has been standing in the plumbing for more than a few hours will reduce any risks associated with metals in water. In addition, do not draw hot water form the tap for consumption.
Hot water can leach higher levels of dissolved metals from pipes.