Skip to Main Content View Text-Only

The City of Portland, Oregon

Portland Water Bureau

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

Customer Service: 503-823-7770


More Contact Info

Backflow Prevention

Backflow = Water Pollution
Backflow is preventable.

Oregon state laws governing water systems require backflow prevention assemblies to be installed on water services where cross connections cannot be eliminated. Backflow assemblies are required to be installed on the water service connections to all fire sprinkler and landscape sprinkler systems. The law also requires backflow assemblies in commercial establishments such as hospitals and mortuaries, as well as industrial facilities. 

Yes, anywhere connections are or can be made between the potable water supply and non-potable water or substances a backflow assembly is required to be installed. An approved, properly installed and maintained backflow assembly essentially eliminates the threat of backflow from either backpressure or backsiphonage.

Backflow assemblies keep you, your family and our water safe.
The easiest way to keep you and your family safe from the potential hazards of backflow through cross connections is to not create cross connections in the first place.  However, if you do have a cross connection to a lawn sprinkler system, boiler, pool, water feature or other type of cross connection, have an approved backflow prevention assembly installed. 

After installation, have the backflow assembly tested by a state certified backflow assembly tester.  This test is required each year in order to comply with state health and plumbing codes. However, there are certain types of backflow assemblies that do not need to be tested.  Although such assemblies are very limited in their application, when installed correctly they prevent backflow and save you the cost of annual testing fees.

Backflow Program 
Coordinator: 503-823-7480
Records: 503-823-3256