Backflow Testing Information

Here you can find out how backflow occurs and how a containment device will protect water supplies.

Backflow is a reversal of the normal direction of water flow in your water supply plumbing system. It presents a hazard where your water supply is inadvertently interconnected with a source of pollution. Those pollutants could then enter your water supply.

Backflow can only occur when the water delivery main is at a lower pressure than your plumbing system. For example, when there is a burst or ruptured main; or excessive demand during fire fighting operations and the like. Backflow can also occur if a pump is connected to your water plumbing system.

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