What is backflow, and how does it occur?
Backflow is the undesirable reversal of flow of water or mixtures of water and other substances back into the public drinking water system. This is usually caused by backpressure, which occurs when downstream pressure rises above the supply pressure. Examples of backpressure would be; pumps, temperature increases in boilers, and elevation of water piping and fittings. Backflow can also be caused by back-siphonage, which is negative pressure that can cause a vacuum in the water system. Examples of events that can cause back-siphonage are water pipe / main breaks and flowing of a fire hydrant.

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1. What is backflow, and how does it occur?
2. How often do backflow events occur?
3. What is a cross-connection?
4. What is a cross-connection program?
5. What are some examples of hazards at my home that need to be protected with a backflow assembly or device?
6. What is a backflow prevention assembly and which one is best to install?
7. Does having a backflow preventer at my meter mean that my home/business is protected?
8. Will installing a backflow preventer affect the water pressure in my home?
9. Why can't my backflow assembly be installed below ground?
10. Why must I have my backflow assembly tested annually?
11. What happens if I do not have my backflow assembly tested and maintained as required?
12. Who is authorized to test my backflow assembly?
13. How will I know if it is time for me to test my backflow assembly?
14. Why can't you send the notice to test directly to the tester?
15. Why do I have a backflow assembly and my neighbor does not?
16. I have a well that is not being used. Is a backflow assembly necessary?