What is the minimum separation requirement between a potable water distribution pipe and a building drain inside the building?

In plumbing design, maintaining proper separation between potable water distribution pipes and building drains is crucial to prevent contamination of the potable water supply. The minimum separation requirement allows for the safe conveyance of water without risking backflow or leakage of contaminants into the drinking water system.

A separation distance of zero inches indicates that there is no required minimum distance between these two types of pipes if specific conditions are met, such as the proper installation and maintenance of systems designed to prevent cross-contamination. This includes making sure that the pipes are installed in a way that protects the potable water lines from any possible backflow or leakage from the drainage system, which could otherwise compromise water quality.

Understanding local plumbing codes is essential, as they outline the necessary precautions and practices that ensure both systems can coexist without impacting the safety of the potable water supply.