Backflow Preventer Information

Backflow Preventer Information

Why they are important, and what to do about it…

The City of Millwood is very fortunate to be one of the few remaining water systems that does not have to add chlorine to disinfect our drinking water.  In order to maintain and protect our water quality the City is advising water customers with irrigation systems that backflow devices are required, and need to be tested annually.

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.

typical backflow prevention device.

For more information about backflow prevention, visit the Spokane Regional Cross Connection Control Chapter website at http://www.src4.org/ed.htm.

The City maintains a list of certified cross-connection testers.  If the customer would like to use a different tester, the tester needs to register with the City of Millwood before doing the work.

Certified Cross-connection Testers

Click Here> Backflow Preventer Testing Certified List 06-06-17

City of Millwood

City of Millwood

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