Deep Dive Toilet Flushing – The Science of Lid Up or Down (You’ll Be Shocked!)
Deep Dive: Toilet Flushing – Lid Up or Down?
Published by Deep Dive Podcast – Visit our Blog
Introduction: A Bathroom Debate That Deserves Attention
We all use toilets, but very few of us think deeply about how we flush them. One of the most hotly debated — and oddly overlooked — questions is: should the lid be up or down when you flush? This seemingly small choice can have major implications for hygiene, health, and cleanliness in your bathroom. Today, we dive into the science behind toilet flushing, toilet plumes, and what’s really being launched into the air every time you press that handle.
What Is a Toilet Plume?
When you flush a toilet, water and waste are rapidly displaced, causing tiny droplets and aerosols to be released into the air. This phenomenon is called a "toilet plume." First described in the 1970s, toilet plumes have since been extensively studied, revealing a disturbing truth: flushing a toilet can launch bacteria, viruses, and other microscopic particles into the air — and these can remain airborne for minutes to hours.
The strength and spread of a plume depend on factors like the toilet design, water pressure, and whether or not the lid is down during the flush.
Scientific Studies and Findings
Multiple studies have documented the dangers of toilet plumes:
- University of Colorado Boulder (2022): High-speed laser imaging revealed that aerosol particles could travel over five feet from a flushed toilet — and linger in the air for over 30 seconds.
- Journal of Applied Microbiology: Pathogens like E. coli and norovirus have been detected in the air after flushing. These can land on surfaces — including toothbrushes and towels.
- American Journal of Infection Control: Toilets in hospitals that are flushed without lids can potentially spread dangerous bacteria and viruses, raising concerns for infection control.
The Toothbrush Danger Zone
One of the more unsettling discoveries is the contamination risk to your toothbrush. If your toothbrush is stored near your toilet — especially within three to six feet — it can be exposed to aerosolized particles from a flush. This is particularly troubling since most people don’t sanitize their toothbrushes daily. Studies have found fecal coliform bacteria on toothbrushes that are stored in shared or poorly ventilated bathrooms.
Covering your toothbrush, keeping it in a drawer, or moving it to a separate room can greatly reduce risk.
Arguments for Lid Down Flushing
Putting the toilet lid down before flushing acts as a physical barrier that prevents or significantly reduces the spread of droplets. It’s a simple action that limits exposure to harmful particles and helps keep your bathroom cleaner.
- Reduces contamination of surfaces and personal hygiene products
- Improves air quality in small, enclosed bathrooms
- Protects vulnerable individuals like children and the elderly from higher bacterial exposure
Counterpoints: What If Your Toilet Has No Lid?
Some public and commercial toilets are designed without lids for easier cleaning or usage. In these cases, consider flushing with the stall door open and stepping away immediately after pressing the handle. Newer models of commercial toilets also use vacuum systems or rapid-flush technologies that may reduce but not eliminate aerosolization.
At home, if your toilet doesn’t have a lid, it’s worth considering upgrading to one that does — especially if hygiene is a priority.
Simple Steps to Reduce Bathroom Contamination
- Always close the lid before flushing
- Ventilate your bathroom with an exhaust fan or open window
- Regularly disinfect surfaces like toilet handles, counters, and toothbrush holders
- Store hygiene products like toothbrushes and razors away from the toilet area
- Consider UV sanitizers for toothbrushes and toilet bowls
Affiliate Resources for a Cleaner Bathroom
Support our work by checking out these hygiene-forward tools on Amazon:
Conclusion: What’s the Verdict?
Flushing with the lid down is a small change that can make a big difference in your hygiene and health. While many overlook this issue, science clearly shows that toilet plumes are real — and potentially harmful. With so many easy solutions, there's really no reason to flush with the lid up anymore.
Want to take it a step further? Invest in tools and practices that keep your bathroom a safe, clean, and sanitary space. Your body — and your toothbrush — will thank you.
Comments
Post a Comment