On new construction, a drain is required to be located no more than how many feet from a RPZ assembly?

The requirement that a drain must be located no more than 5 feet from a Reduced Pressure Zone (RPZ) assembly is based on plumbing codes and standards that aim to prevent contamination of the water supply. The RPZ assembly is a type of backflow prevention device that protects potable water systems from contaminants that could enter the water supply through cross-connections.

When a drain is situated too far away from an RPZ, there is an increased risk that a backflow event may allow contaminants to enter the potable water supply if a malfunction occurs. By keeping the drain within a 5-foot radius of the RPZ, the design ensures that the potential for backflow is minimized and that adequate drainage is provided for any overflow or leakage from the RPZ assembly itself.

This close proximity measurement is critical in maintaining the integrity of the water supply system and in compliance with health and safety regulations. Understanding this regulation is vital for ensuring proper installation and preventing public health hazards associated with drinking water contamination.