How high must the water distribution riser terminate above the ground in manufactured and mobile homes?

The correct termination height for the water distribution riser above the ground in manufactured and mobile homes is 4 inches. This specification is important for several reasons. Primarily, it helps to prevent contamination of the water supply from any surface water that may accumulate around the home. By ensuring the riser is elevated adequately, the risk of dirt, debris, and other pollutants entering the water system is minimized.

Regulatory codes often specify such heights to facilitate maintenance and to comply with health and safety standards. The 4-inch height has been determined to be effective in creating a barrier that protects the riser from potential hazards like flooding or soil contact, which may contribute to water quality issues.

While other heights might seem close, they do not meet the standard set for proper water distribution system safety in these specific housing types. Thus, adhering to the 4-inch requirement is crucial for both compliance with plumbing codes and maintaining the integrity of the water supply.