How do you prevent backflow?

There are 6 basic devices that can be installed to prevent backflow:

  • Air gap
  • Double check valves with atmospheric vent
  • Double check valve
  • Residential dual check valve
  • Reduced pressure principle assembly
  • Vacuum breaker assembly

The device used depends on the degree of hazard to the water system presented by the type of service. Determination as to what device is required is made by Water Resources Field Operations.

Show All Answers

1. What is backflow?
2. What is backsiphonage?
3. What is backpressure?
4. What is a cross-connection?
5. How do you prevent backflow?
6. What is a backflow prevention assembly?
7. I have reclaimed water. Do I need backflow prevention?
8. Who tests and maintains backflow prevention assemblies?