Oregon Administrative Rule 333-061-0070:

(read the whole thing HERE)

“Installation of backflow assembly devices and assemblies are to be installed per Oregon’s Plumbing Specialty Code…. All backflow devices and assemblies are to be tested:

a. Upon installation

b. After a backflow incident

c. If the device is moved or repaired, and

d. At least yearly"

City of Bend Ordinance 14.30:

(read the whole thing HERE)

"All backflow prevention assemblies shall be tested immediately upon installation, and at least annually thereafter by a certified backflow assembly tester at the expense of the property owner, tenant or other person in charge of the property. All assemblies found not functioning properly shall be promptly repaired or replaced at the expense of the owner, occupant or person in control of the premises. An assembly must be retested immediately if moved, repaired or replaced."

Each water provider handles backflow testing a little differently, whether they pass the responsibility on to the customer, or test all assemblies and simply add it to the water bill. Curious about what your responsibility is? Call your water company and ask what their cross connection control program is.