What is a backflow prevention assembly?
A backflow prevention assembly is an approved, testable assembly, which uses check valves and/or relief valves in different configurations, to prevent potential contaminants from flowing into the potable (drinking) water system. An approved backflow prevention assembly has gone through an approval process at the Foundation for Cross-Connection Control and Hydraulic Research (USC FCCC&HR) at the University of Southern California. This is a two-step process of laboratory tests and a 12-month field test. Only assemblies successfully completing the entire testing process are recognized by the district as approved backflow prevention assemblies.

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1. What is backflow?
2. What is a cross-connection?
3. What causes backflow?
4. How can backflow be prevented?
5. What is a backflow prevention assembly?
6. Who is required to have a backflow prevention assembly?
7. Who can test backflow prevention assemblies?