Technology Slice Blog

Hexavalent Chromium Tap Water - The nation's top environmental regulator on Tuesday promised to complete a scientific review of hexavalent chromium by summer and consider ordering cities to start testing for the toxic metal in tap water. During a meeting with senators from Illinois and six other states, U.S. Environmental Protection Agency Administrator Lisa Jackson said new research may lead to an overhaul of federal regulations limiting chromium, a metal that occurs naturally in the environment but also is discharged into water and air by steel mills and other industries. A study released this week by the Environmental Working Group, a nonprofit research and advocacy organization, found hexavalent chromium, also known as chromium-6, in tap water from 31 cities. The amount in Lake Michigan water pumped to 7 million people in Chicago and its suburbs was 0.18 parts per billion, three times higher than a safety limit proposed last year by California officials. Hexavalent Chrom...