Why do I need a backflow prevention device?

The City requires that new water services install a backflow prevention device approved by the State Water Board. Located just after the meter, the device protects the public water supply in the mains from potential contamination by non-potable "used" water drawn in from the customer side. A working backflow prevention device ensures that no waste liquids, industrial fluids, fertilizers, pesticides, or other contaminants reach the public drinking water supply. All devices must be tested annually and immediately repaired if necessary. For more information, contact the Cross Connection Control Program Coordinator at 707-257-9912.

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1. Where does Napa's water come from?
2. Who is served by the City of Napa Water System?
3. What are the major components of the Water System?
4. How much water is used by City of Napa customers?
5. How do I establish water service?
6. How much does the water cost?
7. How can I pay my bill?
8. When do you read my meter? Can I read the meter myself?
9. Why do I need a backflow prevention device?
10. Will PG&E planned power outages affect my water service?
11. How do I report a leak?
12. If I have a leak, who is responsible for repairing it?
13. How do I get my water turned off so I can make repairs to my plumbing or irrigation?
14. How do I report a water quality concern?
15. Why does my water look dirty, have an odd color, or have particles in it?
16. Why does my water have a strange taste or odor?
17. Does the City add fluoride to the drinking water?
18. What is the water hardness?