The height requirement above sewage for water service pipes is essential to prevent what?

The height requirement above sewage for water service pipes is essential to prevent cross-contamination between the potable water supply and the wastewater. When water service pipes are not installed at the proper height, there is a risk that sewage could backflow or leak into the drinking water lines, potentially introducing harmful pathogens and contaminants into the water supply. Keeping water service pipes elevated helps maintain a physical separation between these systems, ensuring that the health and safety of the potable water is protected, thereby complying with public health regulations. This is a critical aspect of plumbing design and installation, as it safeguards against waterborne diseases and other health hazards that can arise from contaminated water.