No water is completely without impurities, even within a municipal system. It is just not possible for them to eliminate every last impurity. Modern technology is getting municipalities closer all the time to being able to do so but in the meantime it is advisable to invest in secondary filtrations systems for your home. There are many systems out there and don’t forget the refrigerator water/ice unit. Use part #ukf8001axx on your refrigerator for the purest water and ice. Anything from sediment, chemicals and bacteria to bad tastes and odors can be lurking in your drinking water. One option, but not always an inexpensive or convenient one, is to use bottled water all the time. Another, more realistic option is to filtrate your tap and refrigerator water.