Why an annual test on the backflow prevention assembly?

Backflow prevention assemblies are installed to protect our drinking water from potential source of contamination. The Washington State Administrative Code requires testing by a certified Backflow Assembly Tester ( BAT ) to ensure that they are functioning as designed.

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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?