Skip to Main Content View Text-Only

Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.


1120 SW Fifth Ave, Suite 600, Portland, OR 97204

More Contact Info

Backflow Assemblies

Backflow prevention assemblies, devices, and/or methods are utilized on water supply piping to protect public water supplies from backflow hazards.

The assemblies protect against hazards caused by backpressure or back-siphonage conditions that could cause pollutants or contaminants to backflow into the public water supply and/or the water user's system.

Air Gap Backflow Prevention

Non-mechanical means of backflow prevention

Backflow Assembly Maintenance

Backflow assemblies are required by law to be tested at least once a year to make sure they are functioning properly.