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Cross Connections

One of the concerns of the Washington State Department of Health involves drinking water cross connections.  A cross connection is any connection between a safe drinking water source and an unsafe source of water or liquid.  This connection presents a health risk and needs to be eliminated or controlled.

Under certain conditions, the water can flow in the reverse direction as a result of system pressure loss.  This is known as backflow.  There are two types of backflow:  Backsiphonage and Backpressure.

Backsiphonage is backflow caused by negative or reduced pressure in the supply lines that may be the result of a main break or firefighting activities in the area.

Backpressure is caused when a non drinking water system pressure is greater than the drinking water system due to a pump, boiler, elevation difference, or air or steam pressure. 

Safe drinking water is a resource that all of us depend on.  We need to be aware that system integrity is a community effort and responsibility.  Please eliminate potential cross connections to ensure a healthy future for yourself, your family, and all members of the community.

Backflow Assembly Inspection Line - Fred Foreman (253) 912-5381 Email