The U.S. Environmental Protection Agency is currently evaluating the potential EHS risks associated with nanoparticles in drinking water. The research is being conducted out of EPA’s National Health & Environmental Effects Research Laboratory and is specifically focused (for the moment) on metal oxide nanoparticles in drinking water. The research is investigating the potential EHS effects of nanoscale zero-valent iron used for groundwater remediation and nanoscale titanium dioxide used in drinking water purification. The project’s first report should be issued by the end of the year, with additional reports on other nanoscale materials over the next few years.