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Cross Connection

What is a Cross Connection?

A cross connection is a temporary or permanent connection between a potable (drinking) water supply and non-potable source.
An example would be the pipes connecting the public water system to an irrigation system.

What is a Backflow?

Backflow is the undesirable flow of non-potable water or other substance through a cross connection back into the consumer’s plumbing system or public water system.
There are two types of backflow: backsiphonage and backpressure.

How can backflow be prevented?

Backflow can be prevented by installing a State-approved/Pleasant View Utility District approved backflow prevention device. The most basic means of preventing backflow is an air gap, which either eliminates a cross connection or provides a barrier to backflow. The basic mechanism for preventing backflow is a mechanical backflow prevention device, which provides a physical barrier to backflow. The principal types of mechanical backflow preventers are the reduced-pressure principle assembly (RPBP) and the double check assembly.
Please contact the District’s administrative office for assistance in determining the type of backflow prevention device applicable to your specific installation.

Where are Cross Connections found?

Cross connection may be found in most plumbing systems.
It is important that each cross connection be identified and evaluated as to the type of backflow prevention required to protect the drinking water system. The most common form is the ordinary garden hose as it can be easily connected to the potable water supply and used for a variety of potentially dangerous applications. Some plumbing fixtures have build-in backflow protection in the form of a physical air gap. However, many cross connections will need to be controlled through the installation of an approved mechanical backflow prevention device or assembly. Some common cross connections include, but are not limited to, the following:

  • Wash basins and service sinks
  • Hose bibs
  • Irrigation sprinkler systems
  • Auxiliary water supplies
  • Laboratory equipment
  • Photo developing equipment
  • Processing tanks Boilers
  • Water recirculation systems
  • Solar heat systems
  • Fire sprinkler systems
  • Swimming pools

Additional Information

9 Thermal Expansion Info

Bkflow Devices Requirements

Protect Your Drinking Water Combined

Bkflow Prevention Devices

Well User Agreement

Coss-Connection Control Program

Coss-Connection Control Survey