How far must mains be from sewers or manholes?

The correct distance that mains must be from sewers or manholes is established to prevent contamination and ensure the integrity of the water supply. A separation of 9 feet is typically required because it helps to reduce the risk of cross-contamination between potable water and wastewater systems. This distance allows for the proper functioning of both systems without interference.

This standard is crucial for maintaining public health and safety, as it minimizes the potential for pathogens or other harmful substances from sewers entering the drinking water supply. The specified distance also accommodates for any subsurface soil conditions or variations that might affect the placement of these utilities.

Understanding this requirement is vital for anyone working in water distribution, ensuring compliance with safety regulations and the protection of community health.