What is back-siphonage?
Back-siphonage occurs when there is a sudden reduction in the water pressure in the distribution system, such as if a water main breaks or if the Fire Department uses a large amount of water to fight a fire. When this occurs water flow can be reversed. This can create a suction effect, drawing 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?