Showerheads and Pathogens (IMAGE) University of Colorado at Boulder Caption A new University of Colorado at Boulder study indicates that biofilms clinging to the inside of bathroom showerheads can harbor up to 100 times the levels of pathogens found in background municipal water. Credit Glenn Asakawa, University of Colorado Usage Restrictions None 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.