Public Works - Backflow Prevention

Cross Connection / Backflow Prevention

Program Purpose

The purpose of a Cross Connection Control Program is to identify potential cross connections on the public water system and require that the proper backflow prevention device is installed at the potential source.

Definition

Cross Connection - a physical connection, directly or indirectly (actual or potential), between a drinkable water system and a liquid or gas that could make the water unsafe to drink. Wherever there is a cross connection, there is a potential threat to public health.

Backflow Prevention Device / Assembly

Backflow Prevention Device / Assembly is an approved, testable device that prevents backflow, backpressure and/or backsiphonage from occurring in the water supply line. Devices must be approved by the University of Southern California Foundation for Cross Connection Control and Hydraulic Research. To see a list of approved devices please go to www. usclist.com. The type of device required is determined by the degree of hazard and type of application.

Backflow Prevention Devices must be installed by a registered plumber or backflow installer and then tested by certified backflow tester who is registered with the Cross Connection Department. The original test report must be turned into the Cross Connection Department within one business day.

All residential irrigations systems, except those that use chemicals and/or fertilizer injection systems, are required to install a minimum of a double check valve and they are to be tested upon installation and every other year thereafter.

Irrigation systems with chemical/fertilizer injection systems must install Reduced Pressure Zone backflow devices and are required to be tested upon installation and once a year thereafter.


Related Links


Irrigation Fittings

Irrigation Fittings

Backflow Assembly

Backflow Assembly in Box

BACKFLOW PREVENTION ASSEMBLY TEST & MAINTENANCE REPORT FORM

All commercial backflow devices will be determined based on the type of application and degree of hazard. These devices are required to be tested every year.

Frequently Asked Questions

Notices