Below are some examples of backflow prevention assemblies. Brief application guidelines are presented next to each. Please refer to DC Water's Cross-Connection Control Policy Manual for definitions)
Reduced Pressure Backflow Prevention Assembly
This assembly may guard against health or non-health hazards, backpressure or backsiphonage and are required to meet American Society of Sanitary Engineers (ASSE) Standard 1013 or 1047. They may be installed on a connection between a building's water service and DC Water's water distribution system.
Double Check Backflow Prevention Assembly
This assembly may guard against non-health hazards, backpressure or backsiphonage and are required to meet ASSE Standard 1015 or 1048. They may be installed on a connection between a building's water service and DC Water's water distribution system.
Pressure Vacuum Breaker
These assemblies may guard against health or non-health hazards, backsiphonage and are required to meet ASSE Standard 1020. They may not be installed on a connection between a building's water service and DC Water's water distribution system. They are usually installed at systems such as a lawn irrigation system.