Backflow prevention devices need to be tested annually, and if the assembly is moved or repaired. A State-certified backflow tester must perform the test, and send copies of the test report to the local water provider.
Portland’s Department of Human Resources enforces Oregon’s administrative rules on backlflow.
The Portland Water Bureau does maintain records on which sites have assemblies installed and mail notifications for annual testing . The Portland Water Bureau also sends an annual report to the Department of Human Resources regarding the testing of all backflow assemblies.
If you are planning on replacing or installing a backflow prevention device make sure you know the installation requirements. The following two requirements from the Portland Water Bureau can be overlooked and make it difficult for a certified tested to perform their duties, assemblies shall be readily accessible with adequate room for testing and maintenance:
Assemblies 2” and smaller (excludes DCDA’s, see next bullet) shall maintain at least 4” clearance on all sides and at both ends respectively. Assemblies larger than 2” (includes 2” DCDA’s) shall maintain at least 4” clearance on the backside, 3” at both ends, 12” underneath, 24” in front and 36” vertically.
A minimum of a Double Check Valve Assembly (DCVA) must be installed on water services: If the water meter is 2” or larger. If the service is for commercial use and/or serves a mixed-use/multi-tenant property (this includes properties where a vending cart(s) are permitted).
Here is the full BACKFLOW ASSEMBLY INSTALLATION REQUIREMENTS