Cross-Connection/Backflow

Backflow
Every day the City of Surprise proudly supplies millions of gallons of water to its citizens. Before the water is delivered to your home, it has gone through careful treatment and numerous tests to ensure its quality meets the requirement of the EPA.

It is the City’s policy is to promote the elimination of actual or potential cross-connections between potable water systems and non-potable water systems, plumbing fixtures and other sources or systems containing substances of unknown or questionable risk to the public drinking water supply.

Common Terms


Backflow Prevention Device:
Shall mean any effective approved assembly used to prevent backflow into a potable water system.

Backflow:
Shall mean the undesirable reversal of flow water or other substances into potable water system.

Backpressure:
Shall mean any elevation of pressure in downstream piping system above the supply pressure.

Backsiphonage:
Shall mean a form of backflow due to a reduction in system pressure which causes subatmospheric pressure to exist at the site in the water system.

Cross-Connection:
Shall mean any unprotected actual or potential connection between the consumer water system and city’s potable water system.

Photos of Approved Backflow Prevention Devices


Air Gap


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Double Check Backflow Prevention Devices (DC)


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Reduced Pressure Principle Backflow Assembly (RP)


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Atmospheric Vacuum Breaker Backsiphonage Prevention Assembly (AVB)


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