How can a backflow occur?

Backflow can occur 2 different ways, by back-pressure or back-siphonage.

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1. What is a cross-connection?
2. How can I prevent a cross-connection?
3. What is backflow?
4. How can a backflow occur?
5. What is back-pressure?
6. What is back-siphonage?
7. Why do water suppliers need to control cross-connections and protect their public water systems against backflow?
8. How can backflow into the City water system be prevented?
9. How do I prevent a cross-connection with my recycled water or rainwater irrigation system?
10. What is a backflow prevention assembly?
11. Who is responsible for the testing and maintenance of the backflow prevention assembly?
12. How do I find a city recognized tester?
13. How do I get added to the city's recognized tester list?