A small amount of chlorine is added to kill any viruses or bacteria that could be present in groundwater. This harmless amount of chlorine helps keep the water protected all the way to your tap. If you are bothered by a slight chlorine smell or taste, you can fill a clean pitcher with cold water, leave the container at least partially exposed to air, and let the water sit. Most, if not all, of the chlorine will dissipate within 12 hours. The key is to not completely seal the container.