What is the minimum height required for drain, waste, and vent piping to be maintained above ground?

The minimum height required for drain, waste, and vent piping to be maintained above ground is six inches. This requirement is set to ensure proper drainage and venting, preventing backflow and allowing for adequate accessibility for maintenance. Keeping the piping elevated helps avoid contamination from soil and standing water, which could compromise the system's integrity. This height also facilitates inspections and work on the system without necessitating extensive digging. By adhering to this minimum height, the plumbing system can operate effectively and maintain compliance with safety standards outlined in the International Residential Code.