Why Closing the Toilet Lid Is a Total Myth? New Study Reveals the ‘Gross Truth’ About Toilet Plumes

For years, people have been told that closing the toilet lid before flushing is the simple fix for stopping germs from spraying around the bathroom. But newer research suggests that advice may be incomplete. Scientists studying “toilet plumes” found that closing the lid does not fully prevent viral particles from spreading to nearby surfaces, and in some cases it may simply change where those particles land. Experts say the real takeaway is not that lid-closing is useless, but that it is not enough on its own to keep a bathroom hygienic.

What Is a Toilet Plume?

A toilet plume is the cloud of tiny droplets and aerosol particles that can rise from the toilet bowl when it flushes. These particles may contain bacteria, viruses, and other microscopic material from contaminated bowl water. Because many droplets are too small to see, the bathroom may look clean even when particles have settled on nearby surfaces such as the toilet seat, floor, walls, sink area, or cleaning tools.

The Lid Does Not Create a Perfect Seal

The biggest problem with relying only on the toilet lid is that most lids do not seal tightly against the bowl. Small gaps around the seat can allow aerosolized particles to escape during flushing. A 2024 study in the American Journal of Infection Control found that closing the lid did not meaningfully prevent viral contamination of bathroom surfaces, showing that germs can still move beyond the bowl even when the lid is down.’

Closing the Lid Can Redirect the Mess

Researchers found that closing the lid may change the direction of the plume rather than stop it entirely. In the study, some floor areas in front of and to the left of the toilet showed more contamination after flushing with the lid closed, while other areas showed less. That means lid position can influence where particles travel, but it does not eliminate the need for regular cleaning and disinfection.

Why Experts Still Don’t Say to Ignore the Lid

Even though lid-closing is not a perfect solution, some experts still recommend doing it because it may reduce visible splash and limit how far some droplets travel. Earlier studies found that lids can reduce certain airborne droplets, but not enough to make bathrooms germ-free. The better message is that closing the lid can be one helpful habit, but it should not replace cleaning, ventilation, and proper handwashing.

Disinfection Was the Big Winner in the Study

The study’s strongest finding was that cleaning made a much bigger difference than lid position. Researchers found that cleaning the toilet bowl with a disinfectant and brush reduced viral contamination on the toilet by more than 99.99% and reduced contamination on the brush by more than 97%. In other words, the “gross truth” is that bathroom hygiene depends far more on regular disinfection than on whether the lid is open or closed.

Toilet Brushes Can Spread Germs Too

Small Bathrooms May Make the Problem Worse

The Best Bathroom Habits Go Beyond the Lid

The Lid Helps, but It Is Not the Magic Fix