Drain Backflow Preventer

Who needs a drain backflow preventer?

Backflow preventers will be required if there exists an actual or potential hazard for a
cross-connection. Some of these hazards include:

  • ƒCommercial and Residential Irrigation systems
  • Fire sprinkler systems
  • Medical facilities
  • Processing plants

What is a backflow prevention program?

A program to detect and prevent possible sources of non-drinking water from entering your public utility drinking water system.

How can this contamination happen?

Contamination of drinking water is usually the result of cross-connections of piping between your drinking water and some other source such as irrigation well or pond. There are planet wide estimates over 100,000 cross-connections occur each day – half of these from garden hoses.

What is an indirect cross-connection?

This is a temporary cross-connection that may exist for a short time. A good example of an indirect cross-connection is a garden hose with the end of the hose submerged in a pail, sink, swimming pool or pesticide dispenser. Some people use the garden hose to flush out sewers and drain pipes.

Why does this backflow preventer need to be installed in front of my house?

To protect the community water system as much as possible and meet state requirements, the backflow preventer needs to be installed as close to the water meter as possible.

Can I cover or hide the drain backflow preventer?

Yes, there are several methods to cover and protect the backflow prevention assembly from weather, vandals and lawn mowing equipment.

Why do some backflow preventers need to be tested every year?

The backflow preventer is a mechanical device that needs maintenance just like a car. The annual test indicates if the parts are working properly to protect your water supply.

My drain backflow preventer sometimes leaks water from a relief valve. Can I remove or plug the valve to prevent water loss?

The relief valve is installed to prevent water pressure from building up too high when the water in a water heater expands. The relief valve can be replaced with a small expansion tank that does not leak. Plugging or removing the relief valve, however, could cause damage to your water heater or plumbing.

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