Why do backflow preventers have to be tested?
Mechanical backflow preventers have internal seats, springs and moving parts that are subject to fouling, wear or fatigue. Additionally, mechanical backflow preventers (and air gaps) can be bypassed. All backflow preventers must be tested periodically to ensure that they are functioning properly. A visual check of air gaps is sufficient, but mechanical backflow preventers have to be tested with properly calibrated gauge equipment.

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1. What is a backflow?
2. What are common reasons for a drop in water main pressure?
3. What is considered a source of pollution?
4. What is a cross-connection?
5. What is a cross-connection or backflow preventer?
6. Why do backflow preventers have to be tested?
7. Who can test backflow preventers?
8. Where can I find a list of certified Cross-Connection Device Inspectors (CCDI)?
9. Who should I contact with questions about whether I currently have a backflow device and what type of device I have?
10. Who should I contact with questions about the completion of a survey, annual testing or delinquency notifications?
11. Where can I submit completed surveys or test forms?
12. What can I do to prevent backflow?
13. What happens if I do not install a backflow prevention device or comply with annual testing?
14. What if my backflow prevention device fails the test?
15. How do I get my backflow prevention device removed?
16. Where can I find additional information regarding backflow prevention?