There are countless filtering devices that can be purchased and installed at the incoming water supply that can remove contamination from bacteria to lead, mercury or PCB's, cleaning solvents or pesticides. Most action taken by official agencies is often some form of filtration on a large scale. In fact, some States have funded programs to help homeowners pay for correcting water problems once they have been documented, New Jersey for example. The point is to take control of your own environment. Lastly, we feel compelled to say something about bottled water.
Many people feel that bottled water is the safe approach to take.
Many bottled water companies do a fairly good job of pre-treating their water prior to sale. However, there are some things to keep in mind. Most bottled water is sold in plastic bottles and there is mounting concern by some health professionals over this. Strictly speaking, most plastics have the potential of allowing transport of gasses through them. This means that if left standing long enough in an atmosphere that contained vapors from some undesirable source, the water inside the bottle may start to show the presence of these materials.