What will happen if I don't test my backflow prevention assembly?

To ensure that your backflow prevention assemblies are functioning as designed, it is important to the City's water system to have testing performed annually. Failure to test an assembly increases the risk that the assembly will fail to protect our water supply.
The City of Bainbridge Island send out reminder notifications about backflow assembly testing requirements to it's water customers. However, it is the water service customer who is responsible for ensuring that the assemblies are tested on time.

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1. Why an annual test on the backflow prevention assembly?
2. Who can test backflow prevention assemblies?
3. What will happen if I don't test my backflow prevention assembly?