There are two types of backflow prevention devices for premise isolation:
Reduced Pressure Pricipal Assembly (RP) devices - these are used for any type of cross-connection or potential cross-connection involving water that has additives or substances, that, under any concentration, can create a danger to health.
Double Check Valve Assembly (DCVA) devices - used on connections that have a low probability of becoming a high or severe hazard.
In order to install a backwater device in Durham Region, the installer needs be a person certified by the Ontario Water Works Association, or other governing body as approved by Durham Region.
Backflow is the undesired reversal of water flow from a building back into the drinking water system that is caused by either back siphonage or back pressure.
Municipalities throughout Canada have implemented back flow prevention programs to help eliminate contaminated drinking water that can cause human health implications and safety issues.