BPA (bisphenol-A) is a chemical used as a hardening agent in plastic bottles. BPA leaches out of plastic and into water. A number of regulatory agencies now view BPA as a possible carcinogen, and a number of states and the country of Canada now ban the use of BPA in food- or drink-related containers. However, many bottled water systems still contain BPA in the bottles. Bottleless water is a healthy alternative that does not contain BPA.