Redmond · King County
Backflow testing in Redmond — campuses, multifamily & homes
Redmond sends annual reminder postcards or letters to every property with a backflow assembly on file. Lawn irrigation, fire suppression, boilers, pools and spas all count — and the test is required even if the system barely gets used.
City of Redmond program
How Redmond’s backflow program works
The short version, summarized from the utility’s own cross-connection control materials.
Source: City of Redmond Water Utility · verified October 2026 ↗Testing is required annually, regardless of how often the protected system is used.
Any Washington State-certified Backflow Assembly Tester can perform the test.
Common residential cross-connections include lawn irrigation, fire suppression, boilers, pools and spas.
Property owners are responsible if their water system contaminates the public supply.
Report submission
We complete the City’s backflow assembly test report and submit it to Redmond’s cross-connection program.
Questions for the utility: (425) 556-2817
On the ground
What we see in Redmond
Every city’s housing stock and commercial mix shapes what’s in the meter box.
Tech campuses & Overlake
Office campuses run cooling towers, boilers, irrigation and fire lines — often dozens of assemblies per site. We build a campus test schedule and deliver one compliance packet.
Downtown multifamily
Redmond’s downtown and Marymoor Village growth means mid-rise buildings with domestic, fire and irrigation assemblies on the same property.
Neighborhoods
Serving all of Redmond
- Downtown
- Overlake
- Education Hill
- Grass Lawn
- Bear Creek
- Idylwood
- Willows / Rose Hill
- Southeast Redmond
- Marymoor
FAQ
Redmond backflow questions
01 Who can test my backflow assembly in Redmond?
02 How do backflow test reports get submitted to City of Redmond?
03 How much does backflow testing cost in Redmond?
04 What if my assembly fails in Redmond?
Field test report · next due
Redmond test due? We’ll handle it.
Book online in two minutes. We test, repair if needed, and file the report with your water utility — and remind you next year.