Who can test my backflow assembly?
Testing can only be performed by a Washington State Department of Health certified backflow tester. A copy of the test report must be sent to the District and a copy should be maintained in your personal files.

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1. Who can test my backflow assembly?
2. How often must I have my backflow assembly tested?
3. What is a cross connection?
4. Where are cross connections found?
5. What causes a cross connection?