Does a Bidet Need a Check Valve?

Does a Bidet Need a Check Valve? A Conor bidet check valve is also known as a backflow prevention valve. Its primary function is to protect the clean water supply from contamination by preventing backflow, which is the reverse flow of water. 

Understanding Backflow and its Risks

Backflow occurs when water starts when water in a plumbing system reverses its flow, potentially carrying contaminants back to the source. It’s like water flowing backwards, carrying possible pollutants, disrupting its intended direction. 

Causes of Backflow:

There are some factors are there including:

Pressure changes: When the water pressure in the main supply line drops, it creates a vacuum that pulls water back from the bidet into the clean water system. 

Siphoning effects: When the water level in the bidet is higher than the water level in the main supply line, siphoning can occur. 

Cross-connections: Improper plumbing connections can create direct pathways for contaminated water to flow back into the clean system. Think of it like two hoses connected; water can flow freely from one hose to the other.

Risks of Backflow: Does a Bidet Need a Check Valve?

Backflow can introduce harmful substances into the water you drink and use, potentially causing:

  • Waterborne illnesses: Contaminated water can contain bacteria like E. coli and Salmonella, leading to severe illnesses like diarrhea, vomiting, and dehydration.
  • Chemical exposure: Pesticides, fertilizers, and other chemicals can be present in contaminated water, causing health problems like cancer and neurological disorders.
  • Sewage contamination: In extreme cases, backflow can even introduce sewage into the clean water supply, posing serious health risks and requiring immediate action.

Preventing Backflow: Does a Bidet Need a Check Valve?

To avoid these risks, several measures can be taken:

  • Maintaining proper plumbing: Regularly inspecting and maintaining your plumbing connections ensures they are leak-free and free of cross-connections.
  • Testing backflow prevention devices: Regularly testing check valves and other backflow prevention devices ensures they are functioning correctly and providing adequate protection.

Types of Check Valves for Bidet

Double Check Valve (DCV) :

A Double Check Valve (DCV) is the recommended backflow prevention valve for bidets due to its simplicity, effectiveness, and maximum protection.

RPZ Backflow Preventer :

The RPZ Backflow Preventer is a bit fancier and pricier compared to the Double Check Valve. It’s designed for bidet setups in places where there’s a higher risk of issues or specific plumbing rules.


Yes, a bidet needs a check valve to prevent backflow and ensure the safety of the clean water supply. Using a bidet without a check valve poses potential health risks and should be avoided. Opt for a DCV or RPZ backflow preventer depending on your specific needs and consult a professional plumber.


Why is a check valve important for a bidet?

To check valve prevents backflow, which is the flow of water from the bidet spray back into the clean water supply. This is important to prevent contamination of the clean water and to protect your health from potential waterborne diseases.

What are the different types of check valves for bidets?

There are two main types:

  • Double Check Valve (DCV): The most common and recommended type, offering maximum backflow protection with two one-way valves.
  • Reduced Pressure Zone (RPZ) Backflow Preventer: A complex and expensive option for high-risk situations, creating a separate pressure zone to isolate the bidet’s water.

What happens if I don’t use a check valve with my bidet?

Without a check valve, contaminated water from the bidet could potentially flow back into the clean water supply, because posing a health risk. It’s crucial to ensure proper backflow protection for safe use.