Backflow Hub

Your Resource for Everything Backflow

As water professionals, it's our duty to provide communities with safe, potable water by preventing the ever-present threat of backflow. Whether you're a beginner or a seasoned professional, stay up to date on the changing demands of our plumbing systems with resources developed by our backflow experts.

National Backflow Prevention Day
Thanks for making the second annual National Backflow Prevention Day a success! Join us next year on 8/16 to recognize backflow preventers and the professionals who install, test, and service them. 

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Examples of Backflow

Our Backflow Brands

Optimize safety, durability, and compliance with Watts’ complete line of backflow prevention devices. As a leader in valve technology for over 130 years, we offer a variety of high-quality backflow prevention solutions from the Watts family of brands
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Backflow Resources


Backflow Basics

Child drinking water from a glass at a table

What is Backflow?

Backflow describes the undesirable reversal of the flow of water from its intended direction in any pipeline or plumbing system. Caused by cross-connections that can potentially allow contaminants into the drinking water system, backflow incidents occur when wastewater or other hazardous materials enter a potable water supply.
Two Type Backflow

Two Types of Backflow

The two types of backflow are known as backpressure and backsiphonage. Backpressure is defined as pressure higher than the supply pressure, caused by a pump, elevated tank, boiler, or any other means that may cause backflow. Backsiphonage describes backflow caused by negative or reduced pressure in the supply piping, often caused by a sudden drop in supply pressure.
A man checking on a backflow preventer

How Can Backflow Be Prevented?

Backflow prevention isn't just critical – it's mandated. All major plumbing code bodies address protection against backflow. Plumbing professionals ensure our communities are safe from the dangers of backflow by identifying cross-connections, specifying and installing the appropriate backflow preventers, and inspecting them to ensure they operate correctly and are up to code.