Back-flow Prevention

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









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


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 Back-flow?

         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: back-pressure and back-siphonage.

         Back pressure 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.

Back-siphonage 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 back-flow 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.

More about back-flow Prevention

        Legionella bacteria is the bacteria that causes Legionnaires’ disease or Pontiac fever, collectively known as legionellosis. Legionella bacteria is transmitted in contaminated water droplets or mist and are inhaled into the lungs, where the bacteria find an environment that is ideal for growth.

Having a backflow preventers installed throughout your building, and having a good cross connection control program will ensure this disease, as well as others, will be prevented from spreading.

Want to learn more about the back-flow prevention services we offer?

Contact Mallard Plumbing & Mechanical today!

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