What is the function of a drain field in a septic system?

The function of a drain field, also known as a leach field, in a septic system is to distribute treated effluent into the soil. After wastewater from a home is processed in the septic tank, solids settle at the bottom, and liquid effluent rises to the top. This effluent is then directed into the drain field, where it percolates through soil layers.

The soil acts as a natural filter, further treating the effluent by removing pathogens and nutrients before it reaches the groundwater. The proper design and maintenance of the drain field are critical to ensuring effective filtration and preventing environmental contamination. This process is essential for maintaining a safe and functioning septic system, making the drain field integral to managing waste effectively.

In contrast to the other choices, none accurately describe the primary purpose of a drain field or align with its role in the septic system.