Understanding the Importance of Backflow Prevention

Does your home require a backflow prevention device? For most people, the conventional answer is “no.” Backflow preventers are generally thought to only be required for businesses, and yet your home may very well have one as well. This blog answers the key questions so you can better understand your plumbing system.

Backflow preventers are required in most multi-family residential buildings, commercial properties, and industrial facilities. These devices serve as a key defense against accidental municipal water contamination. Single-family homes are usually absent from this requirement — with one key exception: an outdoor irrigation system. If your yard uses an automatic sprinkler system directly connected to your water supply, then you are required to install a backflow preventer before any of your irrigation system’s control valves.

Why do irrigation systems require backflow prevention? First, they are prone to problems that could result in sudden pressure changes. Backflow occurs when the pressure on the output side of a system exceeds the pressure from the supply, forcing water in the lines to move backward into the supply line. Second, irrigation systems are vulnerable to contamination — for example, reclaimed water or water contaminated by insects, bacteria, and other organisms that sneak into buried lines.

If you have an irrigation system, your backflow prevention device should be located near your main control valves, usually on a pedestal near your home’s foundation. If your backflow preventer is sitting normally, there’s a good chance you have nothing to worry about. However, if you see water leaking out from the device, don’t hesitate to reach out to Water Doctor of Washington to schedule an inspection. We install new devices, replace worn out or broken ones, and conduct testing and inspection services to ensure your water supply is protected.