Backflow is the undesired reversal of the flow of liquids - such as irrigation water - into the drinking water system.
The two forms of backflow are:
Back siphon - the action of flow reversal caused by a reduction in line pressure
Back pressure - the increase of water pressure caused by elevation or mechanical pumping
The installation of a backflow preventer will protect drinking water systems from possible contamination. If you have questions, would like more information regarding your irrigation system and backflow protection, or if you just need some help, contact us before doing any work at 415-945-1488.