Customer Service: 503-823-7770
GENERAL INFORMATION: 503-823-7404
Water Quality Inspections staff are able to help in the planning and specifications of any backflow assembly installation a project may require.
Contact the Water Quality Inspection Group directly for assistance at 503-823-7480. For records information, please call 503-823-3256.
What is Backflow?
Backflow takes place when water flows opposite of its intended direction. There are two conditions that can cause backflow. It may occur due to either backsiphonage or backpressure in the water system. Backflow can take place within any water distribution system whether it is private or public.
What are Cross Connections?
A cross connection is a physical connection between a potable water supply line and a non-potable source (i.e. chemical process water, ponds, lakes or rivers). Under a backflow condition, connections to non-potable sources could potentially cause contamination of our drinking water. Cross connections can jeopardize the safety of our drinking water. A hazardous backflow incident can occur through cross connections when backpressure or backsiphonage conditions exist.
Backsiphonage and Backpressure Cause Backflow:
For Backflow Assemblies