Toilet flushing creates bacteria-carrying aerosols reaching 1.63 meters

A meta-analysis of 22 studies published in the journal ‘Science of the Total Environment’ reveals that flushing a toilet creates bioaerosols that can spread microorganisms throughout a bathroom. Researchers from Flinders University found that water droplets can travel up to 1.50 meters horizontally and reach heights of 1.63 meters, placing them directly within the breathing zone of adults and posing a higher risk to small children.

These aerosols may contain pathogens such as Escherichia coli, Staphylococcus, and Clostridioides difficile. The study notes that the concentration of germs in the air increases by approximately 30 percent for every additional liter of water used during a flush.

To mitigate these risks, experts recommend closing the toilet lid before flushing, ensuring thorough ventilation, and using water-saving flush settings to reduce turbulence and droplet dispersal. Additionally, hygiene experts advise keeping toothbrushes away from the toilet to prevent contamination from settling particles.