Backflow Prevention Program

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​​​​​​​As a water supplier, the city of Phoenix is obligated to protect its public water supply from the possibility of contamination or pollution by enacting and enforcing a containment (secondary) backflow prevention program.

The Phoenix Uniform Plumbing Code protects the public water supply and private on-site water supply and distribution systems by prohibiting cross-connections between potable (suitable for drinking) and non-potable water systems, and by requiring installation of primary and secondary backflow prevention methods. Secondary backflow methods provide an increased level of protection for the public water supply system.

To learn more, please click on the links below.

Backflow Frequently Asked Questions

Backflow Tester Program Introductory Letter

Technical Guidelines

Standard Details
Note: The Planning & Development Department can not release a list of approved backflow prevention assemblies, which is available to USC members only. However, for information on listed approved backflow assemblies, contact Backflow Prevention at 602-534-2140.

Backflow Testers


Resources and Links

For more information, call 602-534-2140, or Email​