The sump pump shall discharge into what size waste pipe in inches?

The correct size for a sump pump discharge pipe is 2 inches. This size is commonly specified to ensure adequate flow and to prevent potential clogs. A 2-inch pipe can handle the volume of water that a sump pump typically discharges during heavy rain or groundwater infiltration events.

In plumbing systems, using an appropriately sized pipe is crucial for maintaining proper drainage and preventing issues such as backflow or overflowing in the sump pit. While smaller pipes might not manage the volume effectively, a 2-inch discharge pipe allows for efficient removal of water, ensuring that the sump pump can operate effectively without being overtaxed.

Larger sizes, such as 3 or 4 inches, while capable of handling more water, are generally unnecessary for most residential sump pump applications and may lead to increased installation costs or more complex piping systems. Thus, a 2-inch discharge pipe strikes an ideal balance between efficient water flow and practicality for typical home drainage needs.