This video segment adapted from In Small Doses: Arsenic explains how arsenic contaminates groundwater and how people can protect themselves from its hazards. Most arsenic in groundwater comes from minerals in rocks that dissolve through natural processes. But the conditions of the water must be right for arsenic to occur in high concentrations. In the video, scientists also detail the U.S. drinking water standards, the possible health effects of exposure to arsenic, and the steps that cities and private homeowners should take to ensure arsenic levels in their water supplies are safe.
This media asset was adapted from In Small Doses: Arsenic.