What is backflow?

Backflow is the unwanted reversal of flow in a water distribution system. Backflow occurs due to backpressure or back-siphonage and allows non-potable substances to enter a public water system through an unprotected cross-connection.

Backpressure occurs when the pressure in a building’s plumbing exceeds the pressure in the water distribution system.

Backsiphonage occurs when there is a partial vacuum (negative pressure) in a water supply system, drawing liquid from the non-potable source into the water distribution system.

You can find more information https://dnr.mo.gov/print/document-search/pub0393

Show All Answers

1. When do I need to submit my backflow inspection?
2. Why do we require backflow prevention program?
3. What is backflow?
4. Why do we test annually?
5. Who can do my Backflow test?
6. What happens is my Backflow Assembly fails the annual test?
7. Where do I turn in my Backflow test reports?