How often does a backflow preventer need to be tested?

All backflow preventers must be tested on an annual basis.

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1. Who needs a grease trap?
2. Who is considered exempt from these requirements?
3. If a facility does not fall under the aforementioned categories, can they still be exempt from installing a grease trap?
4. How often does a backflow preventer need to be tested?
5. Where can backflow test reports be submitted?