How would a backflow issue occur in a commercial building?

An example of this situation includes customers in a bank observing yellow water flowing from a drinking fountain and green ice rolling out of an ice machine. The contaminants were traced to an error by a maintenance person. A pump for the air conditioning system burned out and the maintenance person, unaware of the danger, connected the system to another pump used for potable water. The result caused large doses of dichromate of soda to be forced into the drinking water supply, causing the dramatic appearance of yellow water and colored ice cubes.

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1. What is backflow?
2. What is a cross-connection?
3. What is the most common form of cross-connection?
4. Is Red Oak the only city in Texas enforcing backflow regulations?
5. What is a cross-connection control program or a backflow prevention program?
6. What is a backflow preventer and why are they needed?
7. What is a Customer Service Inspection (CSI)?
8. Who needs a backflow preventer?
9. Must my home or business have backflow prevention?
10. How would a backflow issue occur with a lawn irrigation system?
11. How would a backflow issue occur in a commercial building?
12. Why does a soft-drink dispensing machine require backflow protection?
13. Is my home or my business “grandfathered” in?
14. Why is the City responsible for enforcing the rules, since they are State of Texas (TCEQ) rules?
15. Who is responsible for the testing and maintenance of the backflow prevention assembly?
16. When are backflow devices required to be tested?
17. Why do backflow devices have to be retested?
18. Who do I call to have a test completed?
19. What will a test cost?
20. Who can I contact for more information on backflow prevention?