Salt Lake City

Public Utilities

Customer Service: (801) 483-6900 | Report Emergency: (801) 483-6700

Cross Connection Control and Backflow Prevention

Cross Connection Control and Backflow Prevention

Through our Cross-Connection Control Program, we provide oversight and monitor connections to our water distribution system. This is important in the protection of public health by preventing possible contamination or pollution caused by water backflowing from residential, commercial, or industrial consumers into the distribution system.

Click buttons below for more information:

What is a Cross Connection?

A cross connection is any actual or potential connection between drinking water (potable) and any fixture, equipment, apparatus, or secondary system that is non-potable. These can include both health and non-health hazards.

Common Cross Connections

Residential: Lawn sprinkling systems, hoses and hose bibs, toilet ball cocks, pools or hot tubs, irrigation systems and secondary water sources such as wells.

Commercial: Lawn sprinkling systems, fire sprinkling systems, boiler, chiller, pool, any industrial process water, irrigation systems, and secondary water sources such as wells.

What is Backflow?

Backflow is the unwanted reversal of flow of water created by a hydraulic condition caused by backpressure or back-siphonage.

Backpressure is caused when a private water system or piece of equipment’s pressure is greater than the incoming water supply’s pressure causing a reversal of flow.

•Common causes of backpressure: pumps, pressurized irrigation, steam or air, and elevation of piping (Water head pressure).

Back-siphonage is caused when there is a reduction in the water supply’s pressure which causes a sub-atmospheric pressure in the water system causing water to reverse in flow.

•Common Causes of back-siphonage: Broken water lines, flushing of fire hydrants or firefighting activities, inadequate piping size, shutting off the water supply, or elevation change.

Click here for a video on backflow from AWWA (American Water Works Association)

How are Cross Connections Protected and Backflow Prevented?

Cross Connections are protected by the installation of a backflow preventer assembly (testable) or by using backflow prevention methods or devices (non-testable). Backflow prevention assemblies are required to be tested annually per State Plumbing Code and Drinking Water regulations and submitted to the water supplier.

Everyone can help protect against backflow by monitoring water use and connections within homes or business.

Backflow Preventer Tests

Test Report Form

List of Local Testers (to be added to this list please reach out to our department)

Submit a Backflow Preventer Test

Backflow Preventers are required to be tested annually or 10 days after installation

To Submit a backflow test report please email or mail the report to


Attn: Cross-Connection Control
1530 S West Temple Street
Salt Lake City, UT 84115

If you received a letter requiring a backflow test report and were given an access code, please submit through our online portal Enter Backflow Test Here.

Other Information & Resources

Backflow Installation Guidelines

Specifications for backflow prevention for irrigation installations

Atmospheric Vacuum Breaker (Not required to be tested annually)

Pressurized Vacuum Breaker

Reduced Pressure Backflow Preventer

Air Gap

Air Gap with secondary (non-potable) water supply

Reduced Pressure Backflow Preventer with secondary (non-potable) supply

General Specifications APWA Standard

Reduced Pressure Backflow Preventer Over 3 inches

Reduced Pressure Backflow Preventer Under 3 inches

For all other backflow installation requirements please refer to the International Plumbing Code, as amended by the State of Utah

Winterizing your Backflow Preventer

Map of our service area

To report a backflow incident or suspected incident please call our 24/7 dispatch number at 801-483-6700.

For Construction projects requiring a backflow or Certificate of Occupancy inspection please call or email to schedule an appointment.

For information related to backflow prevention, contact Dustin White, Cross Connection Control Manager, 801-483-6867 or

For more information about cross connections and backflow prevention, including rules, laws, and permitting please visit the Utah Department of Environmental Quality (DEQ)