Yes! Many pipes in the home contain lead that can leach into hot water since it dissolves toxins much more quickly than cold water. Even pipes that are so-called "lead free" can contain some 8% lead in them! Apparently, according the the EPA, boiling water does not eliminate lead, but may increase the concentration of it. So, don't take any short cuts, make sure any water that you will be consuming is cold tap water. Remember, tap water rules, DON'T BUY BOTTLED!