In January, the U.S. EPA issued guidance to water systems on how to assess the prevalence of hexavalent chromium (chromium-6) in response to new scientific data that suggests hexavalent chromium poses health concerns in people exposed over long periods of time. The guidance includes recommendations on where to collect samples, how often to collect samples, and laboratory analytical methods in an effort to enhance monitoring of hexavalent chromium. For more information on EPA’s new guidance, visit EPA’s website at