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Backflow Prevention

We have highly trained and fully certified professionals to provide custom, expert backflow prevention and cross-connection control services.

We coordinate with public water suppliers and contractors to address needs arising from system modifications, changing regulations, and meter replacement programs.

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For accuracy and convenience, we track and maintain data on all customer backflow prevention devices, and offer access to system status at a moment’s notice.

With our help, you can protect your citizens’ safe drinking water – while containing or even reducing costs.

What is a cross connection and backflow?

Cross Connection is any actual or physical connection between a potable (drinkable) water supply and any source of non-potable liquid, solid or gas that could contaminate drinking water under certain circumstances.

Backflow is the reverse flow of water or other substances into the treated drinking water distribution system. There are two types of backflow: backpressure and backsiphonage.

Backpressure happens when the pressure of the contaminant source exceeds the positive pressure in the water distribution main. An example would be when a drinking water supply main has a connection to a hot water boiler system that is not protected by an approved and functioning backflow preventer. If pressure in the boiler system increases to where it exceeds the pressure in the water distribution system, backflow from the boiler to the drinking water supply system may occur.

Backsiphonage is caused by a negative pressure (vacuum or partial vacuum) in the water distribution system. This situation is similar in effect to the sipping of water through a straw. Negative pressure in the drinking water distribution system can happen because of a water main break or when a hydrant is used for fire fighting.

Why backflow prevention is important?

Drinking water that meets regulations leaving the water treatment facility can become contaminated in the distribution (pipeline) system by backflow when:

A drinking water distribution main is unprotected because of the lack of a properly installed and functioning backflow prevention device on the service connection at the customer's supply. A physical cross connection is made between the drinking water distribution main and a contaminant source. Backflow conditions occur.

How to prevent backflow contamination.

Backflow contamination can be prevented. All water utility customers are required to have approved and functioning backflow-prevention devices installed.

Installation of backflow prevention devices can be completed by a Mallard Plumbing & Mechanical tech.