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Backflow Prevention

Backflow Prevention


Back Flow Prevention from East Point on Vimeo.

Protecting Your Water Against Contamination

Congress established the Safe Drinking Water Act (SDWA) in 1974 to protect human health from contaminants in drinking water and to prevent contamination of existing groundwater supplies. This act and its amendments (1986 and 1996) require many actions to protect drinking water and its sources. One of these actions is the installation and maintenance of an approved backflow prevention assembly at the water service connection whenever a potential hazard is determined to exist in the customer’s system. Without proper protection devices, cross connections can occur.


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What is a cross connection?

A connection between your drinking water and another source of water that combines the two when a backflow condition occurs. When this occurs, your drinking water can become contaminated.

OK. So? What is backflow?

Backflow is when the water in your pipes (the pipes after the water meter) goes backward (the opposite direction from its normal flow). There are two situations that can cause the water to go backward (backflow):

  • Backpressure – the pressure in your pipes is greater than the pressure coming in.
  • Backsiphonage – a negative pressure in one of the pipes.
To protect the water system, two kinds of backflow prevention assemblies (devices that prevent the backflow of water) are required for all business customers that present a potential hazard to the water system:

  • External – to protect the water from cross connection with the water on the customer’s premises
  • Internal – to protect the customer from potentially hazardous cross connections in his own system.


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What is considered a potential hazard?

ANY possibility of pollutants, contaminants, and system or plumbing hazards. For example: fire protection systems, irrigation systems, gasoline refineries and stations, restaurants, hospitals, and manufacturers. Just to name a few.

Now that you have some background, you may ask…What’s the big deal? Well, the big deal is that backflows due to cross connections can cause sickness and death. Even in your own home, you can unwittingly create a cross connection:

  • Putting the garden hose in a swimming pool to fill it.
  • Putting the garden hose in a pet’s water bucket to fill it, or the fish tank.
  • Putting the garden hose down the drain to flush out debris when it’s backed up.
  • Connecting your garden hose to a plant fertilizer or bug spray unit.

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Over half of the nation’s cross connections involve unprotected garden hoses. In Kansas, a man died from drinking out of his garden hose. He had been spraying the yard with poison to get rid of bugs and had connected his garden hose to the spraying device. Unknown to him, during the spraying, a drop in pressure occurred in the main water system causing the poisoned water to backflow into the hose. Enough to kill him when he took a drink from the garden hose after spraying. He had contaminated his own water system.

The Meter Services Division protects the water entering your system. However, it is your responsibility to protect the water on your property or in your home.


For more information on how to protect the water on your property, please call CCWA Backflow Prevention at 770.960.8483.

Download the CCWA Backflow Education Brochure(PDF)


To learn more about Backflow Prevention, visit: American Backflow Prevention Association



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2777 East Point Street
East Point, Georgia 30344