Irrigation system backflow preventer testing is due by August 1. A list of registered certified testers (PDF) is available for your convenience. Thank you for your efforts to keep the Lawrence public drinking water system safe.
The City of Lawrence is prioritizing the enforcement of the Cross Connection Control Program. This program is designed to comply with state and national regulations to protect the potable water supply from contamination. The City has contracted with Aqua Backflow to provide enhanced administration for the City of Lawrence Cross Connection Control Program. If you have any questions related to the program, please contact Aqua Backflow at 847-742-2296 or City of Lawrence Municipal Services & Operations at 785-832-7800.
Code-Compliant Irrigation Backflow Devices & Assemblies
Below is a list of irrigation system backflow devices and assemblies that comply with City code along with photos and descriptions of each.
|Atmospheric Vacuum Breaker (AVB)
Can be used for low or high hazards for non-continuous flow purposes. Usage cannot be more than 12 hours in a 24 hour period. It can have no valves downstream of installation and cannot be subject to backpressure. AVB devices must be installed six inches above the highest point of downstream piping and above grade. This device is not testable.
|Double-Check Valve Assembly (DCVA)
A mechanical device consisting of two internally loaded soft seated check valves with positive shut-off valves on both upstream and downstream ends, and properly located test ports. A DCVA is suitable for low hazard applications only. It can be used for either backpressure or backsiphonage. Typical irrigation installation is in a rectangular valve box in the yard.
|Pressure Vacuum Breaker (PVB) or Spill-Resistant Breaker (SVB)
Can be used for continuous pressure use in high or low hazard situations. The assemblies must be 12 inches above the highest point of downstream piping and have no backpressure.
|Reduced-Pressure Zone Backflow Preventer (RPZ)
An assembly of two independently acting soft seated approved check valves together with a hydraulically operated mechanically independent differential pressure relief valve located between the check valves and below the first check valve. This assembly can be used in high or low hazard continuous pressure situations. It cannot be installed in a pit. This assembly is suitable for backpressure or backsiphonage situations.