We all strive to keep our homes clean and healthy, and hygiene is undoubtedly at the top of our minds in the bathroom. Over the years, we’ve developed routines for keeping things tidy in those bathrooms.
Among the myriad of cleaning conundrums, one question has persisted, dividing households and perplexing the most diligent cleaners: Should you flush the toilet with the lid up or down?

The debate has raged on for years, but recent insights from experts in cleaning and sanitation are shedding light on this bathroom dilemma.
When you flush a toilet, you’re not just sending waste down the pipes; you’re also potentially releasing an ‘aerosol plume’ into the air.
This plume is a fine spray of water particles that can carry bacteria and viruses, such as E. coli, C. difficile, noroviruses, and adenoviruses, into the surrounding environment.
According to a study from the University of Colorado, these microscopic particles can travel 6.6 feet per second and reach heights of 4.9 feet in just 8 seconds. This means that everything in your bathroom, from your toothbrush to your hand towels, could be at risk of contamination.
Shari Cedar, chief operating officer and co-owner of AK Building Services, and Arianna Castro, scientific communications manager at P&G, weighed in on the matter.
‘Even worse, some germs linger in the toilet water for multiple flushes, meaning the risk doesn’t go away after just one flush. And if you’re using a public restroom without a lid? That plume is going everywhere,’ Cedar said.
Nevertheless, both Cedar and Castro agreed that keeping the lid closed is beneficial when flushing.
‘Based on available research, I think it is very advisable to flush the lid down to minimise the aerosolisation of pathogens and promote better hygiene practices,’ Castro said.
‘However, because what is ultimately causing the spread of bacteria is airflow (aerosol plume), it is impossible to completely resolve the risk by closing the toilet lid alone.’
The consensus among experts is clear: regular disinfection is essential. Castro recommended frequent cleaning of the toilet, water, and lid to minimise the spread of pathogens. This and closing the lid before flushing can significantly improve bathroom hygiene.
‘Scientists are working on smarter toilet designs, from improved flush valves to UV sanitation systems,’ Cedar said.’But for now, the best thing you can do? Just close the lid before you flush.’
Tips for a Cleaner Bathroom
Beyond the flushing protocol, there are other measures you can take to maintain a sanitary bathroom:
- Keep your toothbrush covered or stored in a cabinet to protect it from airborne germs.
- Use the exhaust fan or open a window to improve ventilation and help clear the air.
- Regularly disinfect surfaces, including countertops and handles, to keep bacteria at bay.
Have you adopted this practice in your own home? Share your experiences and any additional bathroom hygiene tips in the comments below!
Also read: Discover the surprising toiletry that works as an efficient mould cleaner