What is backflow?
Backflow is just what it sounds like: water flowing in the opposite direction from its normal flow. With the direction of flow reversed (due to changes in pressure), backflow can allow contaminates to enter the potable water system through cross-connections. Without proper backflow devices, something as useful as your garden hose has the potential to contaminate your home’s water supply and the public water system.

A potentially hazardous cross-connection occurs every time someone uses a garden hose sprayer to apply fertilizer or herbicides to their lawn. Without a backflow prevention device between your hose and the spigot, the contents of the hose and anything it is connected to can backflow into the home’s water system and contaminate your drinking water. Please call 707-431-3346 for more information.

Show All Answers

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?