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.
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