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  • Writer's pictureJen Snyder

The Anatomy of a Backflow Prevention Device: What You Need to Know


Do you have a backflow prevention device to protect your water supply? Backflow occurs when contaminated water reverses direction and enters clean water lines. This can happen due to sudden changes in water pressure. Backflow prevention devices are designed to stop this, ensuring our drinking water remains safe.



Here’s how backflow prevention devices work:


  • Check Valves: They allow water to flow in one direction but close automatically to prevent reverse flow.

  • Relief Valve: It opens to relieve pressure if both check valves fail, preventing backflow.

  • Air Gap: This physical separation between water supply and receiving vessel prevents contaminated water from siphoning back.


Malfunctioning backflow preventers can lead to contamination of the clean water supply. Not having them tested is illegal!


We are committed to keeping you compliant. By hiring us you are helping us strive to keep San Diego drinking water safe! Call 877-363-8378 to keep your family and business healthy!



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