top of page

A Comprehensive Guide to Choosing the Right Backflow Preventer for Your Property

The safety of your water supply is a paramount concern for every property owner. A crucial component in safeguarding this resource is the backflow preventer. With a myriad of options available, the question arises: how do you select the right one for your property? 

This blog post aims to demystify the process, equipping you with the knowledge to make an informed decision.

Decoding Backflow and Its Prevention

Backflow is a term in plumbing that refers to the undesirable reversal of water flow in a water supply system. This can lead to the contamination of the potable water supply, posing significant health risks. Backflow preventers are devices engineered to halt this from occurring, ensuring that water only flows in one direction - from the supply to the consumer.

Key Factors in Choosing a Backflow Preventer

Selecting the appropriate backflow preventer for your property involves considering several factors:

  1. Property Type: Residential properties may have different needs compared to commercial or industrial properties. For example, a home may only require a simple hose bib vacuum breaker, while a commercial property with a fire suppression system might necessitate a reduced pressure zone device.

  2. Water System Pressure: The pressure in your water system can influence the type of backflow preventer you need. High-pressure systems may require more robust backflow preventers, such as a reduced pressure zone device.

  3. Hazard Degree: The potential risk associated with backflow in your property also plays a role. Low hazard situations (where backflow could be a nuisance but not dangerous) may only require a double check valve, while high hazard situations (where backflow could cause serious health risks) will need a more secure device like a reduced pressure zone device or an air gap.

  4. Local Regulations: Different regions have different regulations regarding backflow prevention. It's essential to consult with your local water authority or a plumbing professional to understand what's required in your area.

Exploring Types of Backflow Preventers

There are several types of backflow preventers available, each suited to different situations:

  1. Air Gap: The most effective backflow preventer, an air gap is a physical separation between the water supply outlet and the receiving vessel.

  2. Reduced Pressure Zone Device (RPZD): This device has two independent check valves with a pressure-monitored chamber between them. It's suitable for high hazard situations.

  3. Double Check Valve Assembly (DCVA): This device has two check valves installed in series and is typically used in low hazard situations.

  4. Pressure Vacuum Breaker (PVB): This device includes a check valve and an air inlet valve. It's designed to protect against back siphonage, a specific type of backflow.


Selecting the right backflow preventer for your property is a critical step in ensuring the safety of your water supply. By considering the type of property, water system pressure, degree of hazard, and local regulations, you can choose a backflow preventer that provides the best protection for your specific needs. 

Remember, when it comes to backflow prevention, an informed decision is the best decision. Take the time to understand your options and consult with a plumbing professional if necessary. Your water supply, and your health, will thank you.

11 views0 comments


bottom of page