M.U.D. is confident Omaha’s water is safe to drink at the present levels of chromium in its water. Research demonstrates that Cr-6 is converted to Cr-3 in the stomach due to the low pH of the stomach acids. The conversion occurs at pH <4.5. The normal pH of the stomach is in the range of 1 to 3.5. However, there are certain medications which can increase the stomach pH above these levels.