Is it necessary for every water customer to have backflow protection?

No. State regulations exempt single family residences from backflow requirements unless a hazard exists, such as an irrigation system, fire suppression system, a boiler or any other potential hazard. 

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1. What causes back pressure?
2. What is a backflow assembly?
3. What does "approved" mean when selecting an assembly?
4. Is it necessary for every water customer to have backflow protection?