Accepted Backflow Prevention Assemblies
Backflow prevention devices, if properly installed and maintained, allow water to flow in only one direction. Water can flow from the public water system to the customer's property, but not in the other direction.
The type of device that is suitable for your property is based on the degree of hazard your property presents to the public water system. The most common types of backflow devices used are:
- Severe Risk - Reduced Pressure Backflow Assembly (RPBA) – must be tested annually
- Moderate Risk - Double Check Valve Assembly (DCVA) – must be tested annually
- Minor Risk - Dual Check Value – not testable
Types of Backflow Prevention Devices
If you are required to install a backflow preventer, contact the City of Pitt Meadows for recommendations on which preventer to install.
Reduced Pressure Backflow Assembly (RPBA)*
Two independently acting check valves separated by a reduced pressure zone.
Double Check Valve Assembly (DCVA)*
Two internally loaded check valves, force-loaded or internally weighted.
Dual Check Valve (DCV)
Two independently acting, spring loaded check valves.
* Only the Reduced Pressure Backflow Assembly (RPBA) and the Double Check Valve Assembly (DCVA) will be accepted for Premise Isolation backflow devices.
Premise Isolation is having a backflow prevention device installed at the point where the water service enters a property. This provides the proper level of protection from the property, reduces the potential of bypass connections and provides consistency.
The following properties are required to have Premise Isolation at the property line:
Already have Premise Isolation?
If your property already has Premise Isolation installed, you are required to test existing backflow prevention devices on an annual basis.
The specific type of premise isolation backflow preventer (i.e., RPBA or DCVA) will depend on the hazard associated with the property use. Contact the City of Pitt Meadows for the requirement on which preventer to install.
Fixture Isolation is having a backflow prevention device installed at the source of the potential contamination. This provides protection for only a section of the piping system.
Zone Isolation is having a backflow prevention device installed that protects the rest of a building from one particular area.
If your property only has Fixture or Zone Isolation, and you fall into the severe or moderate hazard category, you will need to upgrade to Premise Isolation.