Residential homes that have irrigation sprinkler systems, booster pumps, boilers, geothermal heating systems, or medical equipment connected to the SUB’s water system are required to have backflow assemblies on those systems.
In addition, SUB Water Division Cross-Connection Control Program requires commercial, industrial, public, and multifamily (more than 4 units) users to comply. Because these properties have larger service lines (and therefore pose a greater public safety hazard) and have tenants turn around, they are required to have backflow assemblies installed. In general, all new domestic, fire, and dedicated irrigation lines must have backflow assemblies installed to comply with the SUB Water Division Cross-Connection Control Program Full Manual (PDF).