“Backflow” is the undesirable reversal of the flow of water and other substances from any source into the distribution pipes of the drinking water system. There are two types of backflow conditions: back pressure and back-siphonage. Backflow puts our drinking water at risk of contamination.
Backflow preventers are required on all irrigation systems. The hoses and piping used in irrigation systems is not suitable for potable water. Also, when the sprinklers are turned off, water from the lawn containing chemicals and fertilizer can drain back into the system, since sprinkler heads and pipes are the low spot in your yard. It would be a health risk if this water from the irrigation system were to back up into the drinking water supply.
While backflow preventers are durable and long lasting they do have seals and moving parts and they can wear out. If subjected to freezing temperatures, the water in them can expand and damage the seals or O-rings.
Learn more about winterizing your backflow device.
Learn more about turning on your sprinklers in Spring and checking your backflow device.
