Why do water suppliers need to control cross-connections and protect their public water systems against backflow?
Backflow into the public water system can introduce contaminates, making the water in the system unusable or unsafe to drink. Every water supplier has a responsibility to provide water that is usable and safe to drink under all foreseeable circumstances.

Furthermore, consumers generally have absolute faith that water delivered to them through a public water system is always safe to drink. For these reasons, each water supplier must take reasonable precautions to protect its public water system against backflow. Please call 707-431-3346 to learn more.

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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. What is a backflow prevention assembly?
10. Who is responsible for the testing and maintenance of the backflow prevention assembly?
11. How do I find a city recognized tester?
12. How do I get added to the city's recognized tester list?