If work is done to repair, expand or modify an existing sprinkler system with an unapproved backflow device, the device must be upgraded to current standards as well as tested when installed. After installation, the assembly must be checked every year by a certified tester. Property owners can perform normal maintenance activities on their sprinkler systems including replacing sprinkler heads, repairing a leak or adding additional zones without obtaining a permit. Backflow A backflow prevention assembly prevents water from flowing backward into the water supply system. For example, if a water main breaks causing the water pressure to drop, the sudden drop in water pressure can create a vacuum that sucks water back into the system.
Water pressure can drop when a lot of water is used to fight a fire.
The vacuum is like sipping iced tea with a straw. The liquid flows in the opposite direction. Approved backflow assemblies keep sprinkler system water from returning to the City water distribution lines. It is important to prevent harmful substances like fertilizers, weed killers and pesticides from returning to the city water system. Approved Backflow Prevention Assemblies Save yourself time, energy and hassle by installing an approved assembly.