According to a recent report by the Environmental Working Group, drinking water in Norman contains the highest level of chromium 6 in the United States, 12.9 parts per billion. Chromium 6 is a known carcinogen, but its relatively high level in Norman city water is unlikely to be a health problem.
Read more: http://newsok.com/no-need-for-alarm-over-norman-water/article/3532366#ixzz1BP2Cynnn
