The Minnesota State Plumbing Code requires that a backflow preventer be installed on each lawn irrigation system. This is to prevent lawn fertilizers, weed killers and other contaminants from being drawn back into the drinking water system.
A licensed plumber or the property owner must install the backflow preventer. A plumbing permit is required prior to installation. Testing of the backflow device is required at time of installation and annually thereafter.
For information on how to use your irrigation system efficiently, visit the Smart Water Use page.