Cross Connections

Cross Connection Control Program*

A connection between your drinking water pipes and a potential source of contamination is called a cross-connection. Examples include irrigation systems, fire sprinkler systems, industrial water uses, and nearly every hose-end applicator used for fertilizers or pesticides.

Water customers who have cross-connections including irrigation systems, fire sprinkler systems, or other potential cross-connections, are required to install backflow preventers and have them tested annually for safety and code purposes.

Backflow Preventer Testing is Required Annually

Having a backflow preventer tested entails finding a backflow tester and submitting a report to the City of Snoqualmie. Failure to comply may result in a suspension of water services.

The Public Works Department provides a list of Certified Backflow Assembly Testers that are familiar with the procedures and paperwork for backflow assembly testing.

The listed companies should not be considered "recommended" by the City of Snoqualmie. This is merely a list of companies who have submitted tests and certification information to our office in the past. Many plumbing and irrigation contractors listed in the phone book can provide certified backflow assembly testing and repair. You may wish to call more than one company to compare services and costs.

The City of Snoqualmie requires that test reports be submitted on the City's Backflow Preventer Assembly Test Report form. Please submit the proof of testing form to:

  • Public Works Department
  • PO Box 987
  • Snoqualmie, WA 98065

Contact and/or submit backflow assembly test results:


*The City of Snoqualmie has a proactive Cross-Connection Control Program to protect the public water supply by the elimination or control of cross-connections. Snoqualmie Municipal Code 13.13 and Washington Administrative Code 246-290-490 authorize the program. The provisions of these codes apply to all premises that receive potable water provided by the City of Snoqualmie. Enforcement of the Uniform Plumbing Code and the installation of backflow preventers accomplish protection where necessary. The City of Snoqualmie evaluates water users for degree of hazard to the water supply and monitors 1,500 existing backflow preventers in the system.