What is a leach field?

A leach field, also known as a drain field, is an essential component of a septic system designed for distributing effluent—liquid waste that has been treated by the septic tank. Once the solids settle at the bottom of the septic tank, the liquid effluent is released into the leach field where it is allowed to percolate through the soil. This process not only helps to further treat the effluent through natural filtration but also allows for the safe absorption of water into the ground.

The correct answer highlights the role of the leach field in managing effluent, ensuring that it is dispersed over a large area to mitigate environmental impact and prevent contamination of groundwater. This is crucial for maintaining the effectiveness of the septic system and protecting public health and the environment. In contrast, areas where solid waste is accumulated refer to the septic tank itself, making it clear that the functions of the septic tank and leach field differ significantly.