Understand that it is always recommended to install a backflow preventer in any situation where incoming water and waste water have a chance of being cross-connected. This serves to protect you and your home, keeping your drinking, bathing, and cleaning water safe.

What requires a backflow preventer?

A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. ... Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened).

Does every sprinkler system have a backflow preventer?

If the backflow device must be installed below ground, the only choice is a double check valve backflow preventer. Backflow preventers are required for all irrigation systems. ... MORE ARTICLES ON IRRIGATION AND WATER IN CALIFORNIA: Potable water regulations.