http://articles.mercola.com/sites/articles/archive/2006/05/27/raise-your-cancer-risks-by-drinking-tap-water.aspxSix recent studies, examining a combined total of almost 8,000 people, have indicated that higher consumption of tap water can increase the risk of bladder cancer in men. Men who drank more than 2 liters of tap water a day ran a 50 percent higher riskenCommunityServer 2008.5 SP1 (Build: 31106.3070)