Buildings builts prior to about 1930 may have service connectors made of lead. Letting the water run for an extra 15 seconds after it cools should also flush this service connector. Flushing is important because the longer water is exposed to lead pipes or lead solder, the greater the possible lead contamination. Once you have flushed a tap, you might fill one or more bottles with water and put them in the refrigerator for later use that day. The second step is to never cook with or consume water from the hot-water tap.
Hot water dissolves more lead more quickly than cold water.
So, do not use water taken from the hot tap for cooking or drinking, and especially not for making baby formula . Use only thoroughly flushed water from the cold tap for any consumption. If you own a well or another water source, you can treat the water to make it less corrosive. Corrosion control devices for individual households include calcite filters and other devices. You can purchase bottled water for home and office consumption.