What is Backflow?
Backflow refers to the reverse flow of non-potable water, or other substances, through a cross-connection and into the piping of a public water system. Two types of backflow are backpressure backflow and back-siphonage.
What is Cross-Connection?
A cross connection is any direct or indirect connection, whether intentionally or unintentionally done, between the County’s water system and the customer’s water supply that may contain any substance of unknown or unsafe quality. Therefore, cross-connection control is the management or “control” of these cross-connections to protect public safety by preventing backflow incidents within the public or water consumer’s potable water system.
What is a backflow prevention assembly?
A backflow prevention assembly is a testable mechanical device which uses valves, in different configurations, to prevent contaminated water or chemicals from flowing back into the public drinking water supply system. A cross-control assembly may reduce your water pressure between 7 and 14 p.s.i.
Why do I need one?
A cross-connection can occur at both commercial and residential properties. For commercial customers, cross-connections exist in many forms, from carbonated beverage machines and icemakers, to fire sprinkler systems and x-ray machines. It is not uncommon for a commercial property to have multiple cross-connections at their facility.
Why do backflow assemblies need to be
Mechanical backflow prevention assemblies have internal seals, springs and moving parts that are subject to fouling, wear or fatigue. In addition, mechanical backflow preventers and air gaps can be bypassed. Therefore, all backflow mechanical backflow prevention assemblies have to be tested with properly calibrated gauge equipment.