Water, Water Everywhere ... but not all drops are safe to drink
"At least 6 million city water pipes in the US are made of metal, which is so dangerous there is no acceptable safe level, and many local governments have thin budgets for replacement." - NRDC
Arsenic in water is of great concern. People exposed to arsenic have 65% higher chance of fatal cardiovascular disease. Lead and Cadmium introduce a similar risk.
44 million people living outside city limits are the most vulnerable because they rely on private wells and don't benefit from germ-killing treatments to their wells.