Tap water can be contaminated with a variety of pollutants that your municipal water programme may not be testing for. These contaminants are called "emerging contaminants". For example, did you know that your neighbour's prescriptions could be coming out of your kitchen tap? Many drugs, such as antibiotics and birth control medications pass virtually unchanged through the human body and end up back in our water supplies. Researchers routinely find dozens of pharmaceuticals in tap water samples, and even in our rivers and lakes, including painkillers, antidepressants, 12 and even worse drugs, like methamphetamines and cocaine.
While most people think drinking water from the tap is safe, they don't realise that bacteria and viruses can be swimming in your drinking glass, and traces of toxic metals and industrial contaminants are found in nearly every city water system.