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Please email annual completed certified backflow device tests to

Backflow Devices are also referred to as Cross Connection Devices.

What is Backflow?

Backflow (Cross Connection) devices regulate the waste, or non-potable, water movement in your pipes. The device(s) keeps dirty water from flushing backward into the water system, where it could contaminate the potable, drinkable water supply.  Water districts are required by the Oregon Health Authority to obtain and maintane files of annual testing certificates issued by a certified tester for each device in their district. 

Q: Who needs a backflow device?

A: The Oregon Health Authority requires that the following scenarios require backflow devices to be installed:

  • Homes/businesses with irrigation systems
  • Homes/businesses with pools and hot tubs
  • Medical offices
  • Car washes
  • Restaurants
  • Agricultural farms and dairies
  • Care facilities
  • Schools

If you have questions on your backflow requirements, please feel free to contact us!

Q: How often do I need to have my backflow device(s) tested?

A: Backflow devices are to be tested once a year by a certified backflow testing  agency.

Visit, for a  List of OHA-Certified Backflow Assembly Testers.

Once your test is complete, your tester will submit the test reports to West Slope Water District where we maintain a database of our customer who have backflow devices on their properties, the frequency of testing, and device information.

We send out testing reminders to ensure you have proper notification of when your tests need to be completed.

Additional questions?  Please visit the Oregon Health Authority's website: