rusted pipe (IMAGE) University of California - Riverside Caption The rusted interior of this water pipe contains chromium that reacts with residual water disinfectants to form carcinogenic hexavalent chromium. Credit Water Chemistry and Technology Lab/UCR Usage Restrictions With credit to: Water Chemistry and Technology Lab/UCR License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.