Tap water is not sterile, and using it in home medical devices can result in serious and even deadly infections. But in a study published Wednesday in the journal Emerging Infectious Diseases, one-third of respondents to a survey incorrectly answered that tap water does not contain bacteria or other living organisms.
https://www.cnn.com/2023/01/11/health/unsterile-tap-water-medical-devices-study-wellness/index.html