Backflow and Cross Connection Control Program

As required by the Oregon Health Division, the City of Lake Oswego has a cross connection control program. Its purpose is to protect the public water system as well as the citizens' private water system from possible contamination, and provide the best possible water quality.

Oregon Health Division Administrative Rules, Chapter 333, Cross Control Requirements, and City Ordinance mandate that the City of Lake Oswego undertake a program of inspecting all users' premises where there is reasonable cause to believe an existing or potential cross connection is located; require approved assemblies be installed where cross connections are found; and ensure all backflow assemblies are tested by a State of Oregon certified tester upon installation and on an annual basis thereafter.

Backflow assemblies separate potable water from non-potable water sources such as irrigation systems, hot tubs/spas, medical equipment, and private pump systems, to name a few of the most common. Backflow assemblies are not required in every operation. However, certain operations require assembly.

To determine whether a device is required at your location, a City representative must inspect your premises. Please call (503) 534-5674 or email to make an appointment for an inspection if you believe a cross connection is present in your service.

For your convenience, a list of certified testers in our area is provided below. Please remind testers to check for test cock plugs on devices installed below ground level; they are a City requirement. If any device fails the test, it must be repaired and retested. If more than normal repairs are required on an irrigation system using atmospheric vacuum breakers or a pressure vacuum breaker, those devices shall be replaced with approved double-check backflow devices.

This list is not intended to solicit service or recommend backflow device testers. These testers are private individuals or companies. They are not employed by, nor should they be considered agents of, the City of Lake Oswego. The prices quoted by testers are not based on any City or state pricing standard, but are set by the individual testers.

Please mail Backflow Test Reports to:

City of Lake Oswego
Attn: Backflow
17601 Pilkington Rd
Lake Oswego, OR 97035

All test reports must be submitted by July 15th annually.

Test reports can also be emailed to:

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