"U.S. water utilities have known about the prevalence of a likely carcinogen in water sources for seven years and have failed to share that information with the public, according to an advocacy group, which released today a 2004 industry study of hexavalent chromium.
The American Water Works Association (AWWA) Research Foundation study focused on hexavalent chromium in groundwater sources nationwide. The AWWA report was obtained and released by the nonprofit Environmental Working Group today.
The 124-page report features data from tests on 341 water samples from 189 water utilities in 41 states. About two-thirds of those samples came from groundwater sources, while another third came from surface sources. The report found hexavalent chromium nationwide, particularly in groundwater. The highest levels were found in California."