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Backflow prevention

The purpose of properly installing and testing an approved backflow device is to protect all of our customers from possible contamination.

Backflow means the undesirable reversal of flow of a liquid, gas, or suspended solid into the potable water supply; a backflow preventer is designed to keep this from happening. See the diagram below which shows one type of backflow preventer. There are several styles; this is just an example.

For more information about backflow prevention, visit the Spokane Regional Cross Connection Control Chapter website at

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