The Hidden Dangers of DIY Bidets and Toileting Devices: What You Need to Know
Bidets and alternative toileting devices are becoming increasingly popular in Australia, with many people opting for a more hygienic and eco-friendly solution compared to traditional toilet paper. However, what many homeowners don’t realize is that improperly installed bidets, douches, and other toilet attachments can pose serious health risks—not just to them but to their entire household and even the wider community. As a plumber, I often get contacted by people wanting these devices installed in a way that doesn’t comply with regulations, so I want to take the opportunity to explain why this is a bad idea and how to do it safely.
The Health Risks of Incorrect Installation
The primary concern with DIY bidets is the risk of contaminating the drinking water supply due to something called backflow. Backflow occurs when contaminated water from a toilet or bidet flows backward into the household plumbing or even the public water supply. This can happen in several ways, such as:
Back siphonage – If there is a sudden drop in water pressure (e.g., a burst pipe or high water demand elsewhere in the system), contaminated water from the toilet can be sucked back into the clean water pipes.
Back pressure – If the pressure in the toilet system is higher than the pressure in the clean water pipes, wastewater can be pushed back into the drinking water supply.
If this happens, bacteria like E. coli and viruses from human waste can end up in your tap water—posing a serious health hazard to anyone who drinks or uses it.
Why DIY Installations Are Dangerous
Many people purchase cheap bidet attachments online and install them without proper backflow prevention devices. This is particularly dangerous if the bidet or douche spray connects directly to the toilet’s water supply without an approved Reduced Pressure Zone Device (RPZD) or a High-Hazard Backflow Prevention Device. Without these, you are essentially creating a direct link between your drinking water and potential sewage contamination.
The Legal Requirements in Victoria
In Victoria, plumbing laws are strict for a reason. The Victorian Building Authority (VBA) has issued multiple warnings about the dangers of DIY bidet installations. By law:
Any bidet, douche, or alternative toileting device must be installed by a licensed plumber.
A proper backflow prevention device must be installed to protect the drinking water supply.
All installations must comply with AS/NZS 3500.1: Plumbing and Drainage – Water Services.
Ignoring these laws can result in fines, plumbing failures, and serious health consequences.
The Right Way to Install a Bidet
If you want a bidet or alternative toileting device, here’s what you should do:
Consult a licensed plumber – They will ensure the installation meets all safety and regulatory requirements.
Use an approved product – Many cheap online bidet attachments do not meet Australian standards.
Ensure proper backflow prevention – Your plumber will install the necessary safety devices to prevent contamination.
Get it inspected if needed – Some installations may require a compliance certificate.
Conclusion
While DIY bidet installations may seem like a quick and cost-effective solution, they come with serious risks. Contaminating your drinking water—or even your neighborhood’s supply—is not worth the small savings. If you’re considering a bidet or an alternative toileting device, always hire a licensed plumber to do the job safely and legally. Not only will you protect your own health, but you’ll also be doing your part to keep the community’s water supply clean.
If you have any questions about bidet installations or need help ensuring your setup is compliant, feel free to get in touch!