What is back-pressure?
Back-pressure is when a pump, elevated tank, boiler, etc. in a private system creates pressure that is greater than the pressure provided by the city water system. This can reverse the direction of flow, pushing contaminates into the drinking water system. Please call 707-431-3346 for more information.

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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?