Seattle Public Utilities Mami Hara, General Manager/CEO

Definitions

Authority Having Jurisdiction – The official, board, department, or agency authorized to administer and enforce the provisions of the Uniform Plumbing Code. Also known as the plumbing authority. For Seattle Public Utilities Customers, the authority is Public Health – Seattle & King County (i.e., King County plumbing) except in Shoreline, where it is the City of Shoreline.

Backflow – The undesirable reversal of flow of water or other substances through a cross-connection into the public water system or the customer’s water system.

Backflow Assembly Tester – A person certified by the State of Washington to test backflow assemblies.  

Cross-Connection – Any actual or potential physical connection between a public water system or the consumer’s water system and any source of non-potable liquid, solid or gas that could contaminate the potable water supply by backflow.  

Double Check Valve Assembly – A testable assembly approved for installation by the State of Washington Department of Health that consists of two independently loaded check valves and two resilient seated shut off valves.  

Double Check Detector Assembly – A testable assembly approved for installation by the State of Washington Department of Health that consists of two approved double check valve assemblies arranged in parallel. The bypass assembly is equipped with a meter to detect leakage or water use.

High Health Hazard – A cross-connection that could impair the quality of water and create a public health hazard through poisoning or spread of disease.

Low Health Hazard – A cross-connection that could cause an impairment of the quality of water to a degree that does not create a hazard to public health but does adversely and unreasonably affect the aesthetic quality of the water.  

Pressure Vacuum Breaker Assembly – A testable assembly consisting of an internally loaded check valve, an independently operating air inlet valve and two resilient seated shut-off valves.

Reduced Pressure Backflow Assembly – A testable assembly approved for installation by the State of Washington Department of Health that consists of two independently loaded check valves, a spring-loaded differential pressure relief valve and two resilient seated shut-off valves.