What is an alternative term for a leach field?

A leach field, also known as a drain field, is a key component of a septic system. It is an area where effluent from the septic tank is distributed into the soil, allowing for natural filtration and wastewater treatment through the soil layers. The term "drain field" specifically describes its function in managing and treating wastewater as it percolates through the ground.

The other options do not accurately describe the same function or concept. A drainage basin refers to a broader geographical area that collects and channels water to rivers or streams; a discharge area typically describes a location where fluids are expelled but does not specify the filtration aspect of wastewater; and a seepage pit is a different system component designed to contain effluent but does not serve the same distribution role as a leach field. Therefore, referring to it as a drain field emphasizes its specific operational role within a septic system.