A surprise discovery was made this week as experts detected traces of cancer and psychiatric drugs in British tap water.A study commissioned by the Drinking Water Inspectorate (DWI) and carried out by consultants Watts and Crane Associates, found that small traces of bleomycin, a cancer chemotherapy drug, and diazepam, a sedative, were found in water.The Triflow range of taps from Swiss manufacturer Franke promise to filter out chemicals, bacteria and particles as small as 0.2 microns, serving to keep tap water as healthy as possible but the threats to its purity raised by the bleomycin detections were played down by the report.It stated Drinking water treatment works use a wider and technically more advanced range of processes, but again these are not specifically designed to remove pharmaceuticals and several compounds have been reported in drinking water.It added Even in the worst-case situation, there is no significant risk to health from the intake of pharmaceuticals via drinking water.Sue Pennison of the DWI, said that the reports findings and recommendations were now being taken into account with testing on drinking water likely to ensue.