What is the minimum waste pipe size for a residential food waste grinder?

The minimum waste pipe size for a residential food waste grinder is effectively 1 1/2 inches. This size is commonly accepted in plumbing codes and practices for residential applications, permitting the efficient disposal of food waste while ensuring adequate flow and reducing the risk of clogs.

Using a pipe size that is too small could lead to increased chances of blockages as food waste may not be effectively transported, whereas larger sizes—while capable of handling waste—are not necessary for the typical home installation. Therefore, while larger sizes may be used, the requirement for residential installations appropriately stabilizes at 1 1/2 inches.