Multnomah · Washington · Clackamas County
Find an OHA-certified backflow tester in Portland.
The Water Bureau's spring letter means your backflow assembly is due for its annual test. Browse 162 certified testers and call one directly. Most tests run about $50–150 and take under an hour.
73 in Multnomah · 68 in Washington · 61 in Clackamas — from the official OHA list.
Run by Zeb, a St. Johns homeowner who got the same letter. About this site.
How it works
- 1
Browse testers in your county
OHA-certified testers for Multnomah, Washington, and Clackamas counties, in one place — search by company, city, or ZIP code.
- 2
Tap to call and schedule
Call a tester directly to book your test. (Online booking is coming soon.)
Why this is required
Oregon law (OAR 333-061) requires every backflow prevention assembly to be tested annually by an OHA-certified Backflow Assembly Tester. Property owners are responsible for scheduling it, and water purveyors have the authority to disconnect service for non-compliance. The Portland Water Bureau sends reminder letters each spring but does not perform tests itself.
Frequently asked questions
- Do I have to use a tester from this list?
- No. You can use any Oregon Health Authority–certified backflow assembly tester. This directory simply pulls from OHA's public list so you can find one that serves your county and call them directly.
- How much does a backflow test cost in Portland?
- A routine annual test of a single residential assembly typically runs about $50–150, depending on the tester, whether you need a scheduled appointment, and how many assemblies you have.
- How often do I need a backflow test?
- Oregon requires backflow prevention assemblies to be tested at least once per year by an OHA-certified tester. The Portland Water Bureau mails reminder letters each spring.
- Is PDX Backflow affiliated with the Water Bureau or OHA?
- No. PDX Backflow is an independent directory. We are not affiliated with, endorsed by, or operated on behalf of the Portland Water Bureau, the City of Portland, or the Oregon Health Authority.