Which component of a septic system is responsible for disposing of treated effluent?

The drain field is the component of a septic system responsible for disposing of treated effluent. After wastewater undergoes an initial treatment in the septic tank, where solids settle to the bottom and scum rises to the top, the liquid effluent that is less contaminated is sent to the drain field. Here, it is further treated through a natural filtration process as it percolates through the soil. The soil microorganisms help break down any remaining pathogens and nutrients, thereby completing the treatment process before the water eventually reaches groundwater.

In comparison, the septic tank stores and breaks down waste, the pump chamber assists in moving effluent to the drain field when gravity isn't sufficient, and the vent pipe allows gases to escape from the septic system to prevent pressure buildup. None of these components directly handle the final disposal of treated effluent as the drain field does.